Schedule of Subsidiary of Limited Liability Company or Limited Partnership [Table] Subsidiary of LLC or LP [Table] Redemption of redeemable non-controlling interests Redemptions of redeemable non-controlling interests in Consolidated Funds Payments for Repurchase of Redeemable Noncontrolling Interest Related Party Transactions Related Party Transactions Disclosure [Text Block] Payments to acquire additional interests Payments to Acquire Additional Interest in Subsidiaries Non-Controlling Interests in Legacy Greenspring Entities Legacy Entities [Member] Legacy Entities Contingent consideration obligations Business Combination, Contingent Consideration, Liability [Member] Business Combination, Contingent Consideration, Liability Cover [Abstract] Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Net increase in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect O 2026 Q1 Dividends O 2026 Q1 Dividends [Member] O 2026 Q1 Dividends Measurement Input, Discount Rate Measurement Input, Discount Rate [Member] Schedule of Maturities of Operating Lease Liabilities Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Trading Symbol Trading Symbol Total compensation and benefits Compensation And Benefits Expense Compensation And Benefits Expense Comprehensive income (loss) before non-controlling interests Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest AUD Screen Rate Multiplied By Statutory Reserve Rate AUD Screen Rate Multiplied By Statutory Reserve Rate [Member] AUD Screen Rate Multiplied By Statutory Reserve Rate Non-NEOs Non-NEOs [Member] Tax benefits related to equity-based awards Share-Based Payment Arrangement, Expense, Tax Benefit Dividends declared per share of Class A common stock (in dollars per share) Dividend (in dollars per share) Common Stock, Dividends, Per Share, Declared Redemption of redeemable non-controlling interests Temporary Equity, Accretion to Redemption Value Distributions Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Unrealized Unrealized performance fee-related compensation Performance Fee-Related Compensation Related to Carried Interest Allocation, Unrealized Performance Fee-Related Compensation Related to Carried Interest Allocation, Unrealized Line of Credit Facility [Table] Line of Credit Facility [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fees and accounts receivable Increase (Decrease) in Accounts Receivable Amounts paid to settle liability classified awards Share-Based Payment Arrangement, Cash Used to Settle Award Organization Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Exchange Two Exchange Two [Member] Exchange Two Fair Value Measurements Fair Value Disclosures [Text Block] Interest rate in effect Line of Credit Facility, Interest Rate at Period End Award Timing Disclosures [Line Items] Class D exchange agreement, acceleration exchange, period Transaction Agreement, Maximum Period To Exchange Shares In Acceleration Exchange Transaction Agreement, Maximum Period To Exchange Shares In Acceleration Exchange Investment, Name [Domain] Investment, Name [Domain] Number of classes of common stock outstanding Number Of Classes Of Common Stock Outstanding Number Of Classes Of Common Stock Outstanding Segments Segment Reporting, Policy [Policy Text Block] Revenue from Contract with Customer [Abstract] Offering price per share (in dollars per share) Sale of Stock, Price Per Share Plan Name [Domain] Plan Name [Domain] Class B Partnership Unit Class B Partnership Unit [Member] Class B Partnership Unit United States UNITED STATES Accrued compensation and benefits Employee-related Liabilities S 2026 Q1 Dividends S 2026 Q1 Dividends [Member] S 2026 Q1 Dividends Intangible assets, gross Finite-Lived Intangible Assets, Gross Variable Interest Entities Variable Interest Entity Disclosure [Text Block] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Award Timing Method Award Timing Method [Text Block] Net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Carried interest allocations, SMAs Carried Interest Allocation, Separately Managed Accounts [Member] Carried Interest Allocation, Separately Managed Accounts Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Insider Trading Policies and Procedures [Line Items] Use of Estimates Use of Estimates, Policy [Policy Text Block] Adjustment to Compensation, Amount Adjustment to Compensation Amount Compensation Amount Outstanding Recovery Compensation Amount Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Entity Small Business Entity Small Business Company Selected Measure Amount Company Selected Measure Amount Tabular List, Table Tabular List [Table Text Block] Level III Fair Value, Inputs, Level 3 [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Advisory and other services Management And Advisory Fees, Net, Advisory And Other Services [Member] Management And Advisory Fees, Net, Advisory And Other Services Vesting of Class B2 units and issuance of corresponding Class B common stock at par value Stock Issued During Period, Value, Restricted Stock Award, Net of Shares Withheld For Employee Taxes Stock Issued During Period, Value, Restricted Stock Award, Net of Shares Withheld For Employee Taxes Antidilutive securities excluded from computation of earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Non-Controlling Interests in the Partnership Partnership Of Subsidiary [Member] Partnership Of Subsidiary Share-based Payment Arrangement, Tranche One Share-Based Payment Arrangement, Tranche One [Member] Swiss Average Rate Overnight Swiss Average Rate Overnight [Member] Swiss Average Rate Overnight Purchases of investments of Consolidated Funds Investments Of Consolidated Funds, Cost Investments Of Consolidated Funds, Cost Class C common stock Common Class C [Member] Credit Facility [Domain] Credit Facility [Domain] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Class D Partnership Units Class D Partnership Units [Member] Class D Partnership Units Realized Performance Fee-Related Compensation Related to Carried Interest Allocation, Realized Performance Fee-Related Compensation Related to Carried Interest Allocation, Realized Goodwill Goodwill Valuation Allowance [Roll Forward] Valuation Allowance [Roll Forward] Valuation Allowance Payments for acquisition-related contingent consideration Payment for Contingent Consideration Liability, Operating Activities Payments for employee taxes related to net settlement of RSUs Payment, Tax Withholding, Share-Based Payment Arrangement Carried interest, contingent repayment obligations Equity Method Investment, Carried Interest Allocations, Maximum Amount Subject To Contingent Repayment Equity Method Investment, Carried Interest Allocations, Maximum Amount Subject To Contingent Repayment Legacy carried interest allocation as percentage of cumulative fund or account performance Revenue, Legacy Carried Interest Allocation As Percentage Of Cumulative Fund Or Account Performance Revenue, Legacy Carried Interest Allocation As Percentage Of Cumulative Fund Or Account Performance Entity Information [Line Items] Entity Information [Line Items] Employee Stock Option Share-Based Payment Arrangement, Option [Member] Depreciation Depreciation Variable Interest Entity, Not Primary Beneficiary, Subsidiaries Variable Interest Entity, Not Primary Beneficiary, Subsidiaries [Member] Variable Interest Entity, Not Primary Beneficiary, Subsidiaries FY2026 Lessee, Operating Lease, Liability, to be Paid, Year One Other financing activities Proceeds from (Payments for) Other Financing Activities Sale of non-controlling interests Noncontrolling Interest, Increase from Sale of Parent Equity Interest Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Security, Excluded EPS Calculation [Table] Comprehensive income (loss) attributable to StepStone Group Inc. Comprehensive Income (Loss), Net of Tax, Attributable to Parent SMAs Management And Advisory Fees, Net, Separately Managed Accounts [Member] Management And Advisory Fees, Net, Separately Managed Accounts Payments on fund credit facility Repayments of Lines of Credit Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Award Type [Axis] Award Type [Axis] Weighted-average shares of Class A common stock: Earnings Per Share, Basic [Abstract] Units issued for purchase of asset class non-controlling interests (in shares) Stockholders' Equity, Units Issued For Purchase Of Asset Class Noncontrolling Interest Stockholders' Equity, Units Issued For Purchase Of Asset Class Noncontrolling Interest Property and equipment, net Property, Plant and Equipment, Net ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag SRA SRA [Member] SRA Contributed capital Partners' Capital Account, Contributions Total liabilities Liabilities Liabilities Non-controlling interests Less: Amounts attributable to non-controlling interests Equity, Attributable to Noncontrolling Interest Dividend per share of Class A common stock (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Foreign Currency Foreign Currency Transactions and Translations Policy [Policy Text Block] Revolving credit facility Revolving Credit Facility [Member] Expiration Date Trading Arrangement Expiration Date Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Stepstone Funds Equity Method Investee [Member] Total carried interest allocations Revenue Not from Contract with Customer Total Shareholder Return Amount Total Shareholder Return Amount Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Transfers out of Level III Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Legacy Greenspring Carried Interest Allocations Legacy Carried Interest Allocation [Member] Legacy Carried Interest Allocation Subsequent Event [Line Items] Subsequent Event [Line Items] Property and equipment, gross Property, Plant and Equipment, Gross New York Federal Reserve Bank Rate New York Federal Reserve Bank Rate [Member] New York Federal Reserve Bank Rate Debt Instrument [Line Items] Debt Instrument [Line Items] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Intangibles and Goodwill Goodwill and Intangible Assets, Policy [Policy Text Block] Consolidated Entity, Excluding Consolidated VIE Consolidated Entity, Excluding Consolidated VIE [Member] Other assets and receivables Other Assets Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Diluted (in shares) Weighted-average shares of Class A common stock outstanding - Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Due to related parties, tax receivable agreements Due To Related Parties, Tax Receivable Agreements Due To Related Parties, Tax Receivable Agreements MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Total StepStone Group Inc. stockholders’ equity Equity, Attributable to Parent Total deferred tax assets before valuation allowance Deferred Tax Assets, Gross Proceeds from issuance of notes payable Proceeds from Issuance of Debt Legacy carried interest allocation, SMAs Legacy Carried Interest Allocation, Separately Managed Accounts [Member] Legacy Carried Interest Allocation, Separately Managed Accounts Concentration Risk Type [Domain] Concentration Risk Type [Domain] Accounting Standards Update and Change in Accounting Principle [Table] Accounting Standards Update and Change in Accounting Principle [Table] Letters of credit outstanding Letters of Credit Outstanding, Amount Non-discretionary contributions Defined Contribution Plan, Cost Sale of Stock [Domain] Sale of Stock [Domain] Document Fiscal Period Focus Document Fiscal Period Focus All Executive Categories All Executive Categories [Member] Assumed vesting of shares (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Equity securities Equity Securities [Member] 2027 Finite-Lived Intangible Asset, Expected Amortization, Year Two Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Shares exchanged (in shares) Stockholders' Equity, Share Exchange, Shares Exchanged Stockholders' Equity, Share Exchange, Shares Exchanged Assets Assets [Abstract] Total other comprehensive income (loss) Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Document Type Document Type Investments of consolidated funds, percent of total investments Investments of Consolidated Funds, Percent Of Total Investments Investments of Consolidated Funds, Percent Of Total Investments Shares issued (in shares) Stockholders' Equity, Share Exchange, Shares Issued Stockholders' Equity, Share Exchange, Shares Issued Class Of Partnership Unit [Axis] Class Of Partnership Unit [Axis] Class Of Partnership Unit Unrealized investment income of Consolidated Funds Unrealized Investment Gain (Loss) From Consolidated Funds Unrealized Investment Gain (Loss) From Consolidated Funds Schedule of Future Amortization of Finite-lived Intangible Assets Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Excluding Consolidated Funds Excluding Consolidated Funds [Member] Excluding Consolidated Funds Subsequent Event [Table] Subsequent Event [Table] Maximum Maximum [Member] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Goodwill, impairment loss Goodwill, Impaired, Accumulated Impairment Loss Intangible assets, net Finite-Lived Intangible Assets, Net Office furniture Furniture and Fixtures [Member] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Investment Type [Axis] Investment Type [Axis] Total lease cost Lease, Cost Statistical Measurement [Axis] Statistical Measurement [Axis] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Purchase of non-controlling interests Payments to Noncontrolling Interests Income (loss) before income tax Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Name Outstanding Recovery, Individual Name Schedule of Change in valuation allowance Summary of Valuation Allowance [Table Text Block] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Variable lease cost Variable Lease, Cost Impairment of goodwill Goodwill, Impairment Loss Cash-based compensation, term Deferred Compensation Arrangement with Individual, Maximum Contractual Term Less: Comprehensive income attributable to redeemable non-controlling interests Comprehensive Income (Loss), Net Of Tax, Redeemable Noncontrolling Interest Comprehensive Income (Loss), Net Of Tax, Redeemable Noncontrolling Interest Liability classified awards recognized in accounts payable, accrued expenses, and other liabilities Deferred Compensation Share-Based Arrangements, Liability, Current and Noncurrent Award Timing Predetermined Award Timing Predetermined [Flag] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Dividends paid to common stockholders Payments of Ordinary Dividends, Common Stock Investment, Name [Axis] Investment, Name [Axis] Redemption price, percentage Debt Instrument, Redemption Price, Percentage Client relationships Customer Relationships [Member] Diluted (in dollars per share) Diluted (in dollars per share) Earnings Per Share, Diluted Counterparty Name [Domain] Counterparty Name [Domain] Domestic income (loss) before income tax Income (Loss) from Continuing Operations before Income Taxes, Domestic Amounts receivable from loans Other Receivables, Loans [Member] Other Receivables, Loans Total current income tax expense Current Income Tax Expense (Benefit) Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Ownership [Axis] Ownership [Axis] Vesting percentage Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage Minimum amount of prepayment, percentage Debt Instrument, Minimum Amount Of Prepayment, Percentage Debt Instrument, Minimum Amount Of Prepayment, Percentage Carried interest allocation, focused commingled funds Carried Interest Allocation, Focused Commingled Funds [Member] Carried Interest Allocation, Focused Commingled Funds Retirement Benefits [Abstract] Preferred stock, issued (in shares) Preferred Stock, Shares Issued Foreign currency translation gains (losses) Gain (Loss), Foreign Currency Transaction, before Tax Financial Position Statement of Financial Position [Abstract] Partnership StepStone Group LP [Member] StepStone Group LP Change in fair value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Legacy carried interest allocation, focused comingled funds Legacy Carried Interest Allocation, Focused Commingled Funds [Member] Legacy Carried Interest Allocation, Focused Commingled Funds Fair value of awards vested Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Net income (loss) Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Loss on sale of subsidiary Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Income tax expense (benefit) Income tax expense Total income tax expense (benefit) Income Tax Expense (Benefit) Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Other income (expense) Nonoperating Income (Expense) [Abstract] Noncontrolling Interest in Consolidated Funds Noncontrolling Interest In Consolidated Funds [Member] Noncontrolling Interest In Consolidated Funds LTIP 2020 Long-Term Incentive Plan [Member] 2020 Long-Term Incentive Plan Unrecognized non-cash compensation, period of recognition Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Revenues Service fees Revenue from Contract with Customer, Excluding Assessed Tax Product Information [Line Items] Product Information [Line Items] Statement of Comprehensive Income [Abstract] Amounts payable to non-controlling interest holders in connection with Tax Receivable Agreements Other Liabilities, Non-Controlling Interest Holders due to Tax Receivable Agreements [Member] Other Liabilities, Non-Controlling Interest Holders due to Tax Receivable Agreements SRE SRE [Member] SRE Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Share exchange ratio Stockholder's Equity, Share Exchange Ratio Stockholder's Equity, Share Exchange Ratio Stock-based compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Percent All Adjustments to Compensation All Adjustments to Compensation [Member] Schedule of Equity Method Investments Equity Method Investments [Table Text Block] Changes in operating assets and liabilities of Consolidated Funds: Adjustments To Reconcile Net Income (Loss) To Cash Provided By (Used In) Operating Activities, Consolidated Funds [Abstract] Adjustments To Reconcile Net Income (Loss) To Cash Provided By (Used In) Operating Activities, Consolidated Funds Additional paid-in capital Additional Paid in Capital Focused commingled funds Management And Advisory Fees, Net, Focused Commingled Funds [Member] Management And Advisory Fees, Net, Focused Commingled Funds Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Commitments and Contingencies Disclosure [Abstract] Less: Comprehensive income (loss) attributable to non-controlling interests Comprehensive Income (Loss), Net of Tax, Attributable to Nonredeemable Noncontrolling Interest Comprehensive Income (Loss), Net of Tax, Attributable to Nonredeemable Noncontrolling Interest Decrease in deferred tax assets, Transaction Agreements Increase (Decrease) in Deferred Tax Asset, Transaction Agreements Increase (Decrease) in Deferred Tax Asset, Transaction Agreements Related Party Transaction [Axis] Related Party Transaction [Axis] Vesting of RSUs, net of shares withheld for employee taxes Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Restricted cash Restricted Cash Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Entity Address, State or Province Entity Address, State or Province Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] General Partner General Partner [Member] Legacy Greenspring investments in funds Legacy Investments In Funds Legacy Investments In Funds Computer equipment and software Computer Equipment And Software [Member] Computer Equipment And Software Vesting [Domain] Vesting [Domain] Beginning balance (in dollars per share) Ending balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Liabilities and stockholders’ equity Liabilities and Equity [Abstract] Maximum share purchase, value Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Number of Shares Per Employee, Value Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Number of Shares Per Employee, Value Valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Adjustments to reconcile net income to net cash provided by operating activities of Consolidated Funds: Adjustments To Reconcile Net Income (Loss) To Net Cash Provided By Operating Activities Of Consolidated Funds [Abstract] Adjustments To Reconcile Net Income (Loss) To Net Cash Provided By Operating Activities Of Consolidated Funds Restatement Determination Date Restatement Determination Date Investment income Net Investment Income Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Amounts payable to StepStone Funds Other Liabilities, StepStone Funds [Member] Other Liabilities, StepStone Funds Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Lease right-of-use assets, net Operating Lease, Right-of-Use Asset Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Sterling Overnight Index Average Sterling Overnight Index Average [Member] Sterling Overnight Index Average Schedule of Fair Value of Liabilities and Assets Fair Value, Liabilities Measured on Recurring Basis [Table Text Block] Contributions to investments Payments to Acquire Equity Method Investments Property, Plant and Equipment [Abstract] Temporary Equity, by Class of Stock [Table] Temporary Equity, by Class of Stock [Table] Accrued dividends Dividends Payable, Current Earnings Per Share Earnings Per Share [Text Block] Class A common stock issued under ESPP Stock Issued During Period, Value, Employee Stock Purchase Plan Subsequent Event Subsequent Event [Member] Expenses Costs and Expenses [Abstract] GBP Base Rate GBP Base Rate [Member] GBP Base Rate Granted (in dollars per share) Granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Net realized and unrealized gain (loss) on investments Total investment income of Consolidated Funds Gain (Loss) on Investments Class D exchange agreement, period Transaction Agreement, Maximum Period To Exchange Shares Transaction Agreement, Maximum Period To Exchange Shares Income Taxes Income Tax, Policy [Policy Text Block] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Investments in funds Investments in funds Equity Method Investments, Excluding Accrued Carried Interest Allocations Equity Method Investments, Excluding Accrued Carried Interest Allocations Proceeds from borrowings on fund credit facility Proceeds from Lines of Credit PEO PEO [Member] Name Trading Arrangement, Individual Name Underfunded pension obligation Defined Benefit Plan, Funded (Unfunded) Status of Plan Cash-based compensation, expense Deferred Compensation Arrangement with Individual, Compensation Expense Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Entity Public Float Entity Public Float Investment income (loss) Income (Loss) from Equity Method Investments Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Share-based Payment Arrangement, Tranche Three Share-Based Payment Arrangement, Tranche Three [Member] Number of shares reserved for future issuance (in shares) Common Stock, Capital Shares Reserved for Future Issuance Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Base interest rate Debt Instrument, Base Interest Rate Debt Instrument, Base Interest Rate Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Local Phone Number Local Phone Number Valuation allowance Deferred tax assets, valuation allowance Beginning balance Ending balance Deferred Tax Assets, Valuation Allowance Earn-out (up to) Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Schedule of Equity Method Investments [Table] Equity Method Investment [Table] Total performance fee-related compensation Performance Fee-Related Compensation Related to Carried Interest Allocation Performance Fee-Related Compensation Related to Carried Interest Allocation Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Secured Overnight Financing Rate (SOFR) Secured Overnight Financing Rate (SOFR) [Member] Legacy Greenspring accrued carried interest allocations Legacy Accrued Carried Interest Allocations Legacy Accrued Carried Interest Allocations PEO Total Compensation Amount PEO Total Compensation Amount Discount rate Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Total equity method income (loss) Revenue Not From Contract With Customer, Income Loss From Equity Method Investments And Investment Income Revenue Not From Contract With Customer, Income Loss From Equity Method Investments And Investment Income Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Debt Disclosure [Abstract] Common Stock Common Stock [Member] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Schedule of Changes in the Fair Value of Level III Financial Instruments Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Credit Agreement Line of Credit [Member] Segment Reporting [Abstract] Entity Central Index Key Entity Central Index Key Equity Method Investments and Joint Ventures [Abstract] Limited Partners Limited Partners [Member] Limited Partners Foreign currency translation adjustments Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Unfunded capital commitments Off-Balance-Sheet, Credit Loss, Liability Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Stockholders' Equity and Redeemable Interests Equity [Text Block] Partner Type of Partners' Capital Account, Name [Domain] Partner Type of Partners' Capital Account, Name [Domain] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Segment Reporting Segment Reporting Disclosure [Text Block] Change in fair value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Current Events Current Events, Policy [Policy Text Block] Current Events, Policy Equity-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition S 2024 Q1 Dividends S 2024 Q1 Dividends [Member] S 2024 Q1 Dividends Class B Common Stock Class B common stock, $0.001 par value, 125,000,000 authorized; 39,656,954 and 45,030,959 issued and outstanding as of March 31, 2025 and 2024, respectively Class B Common Stock Common Class B [Member] Title Trading Arrangement, Individual Title Consolidated Entities [Axis] Consolidated Entities [Axis] Schedule of Income before income tax Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Unrecognized tax benefits Unrecognized Tax Benefits City Area Code City Area Code Auditor Location Auditor Location Contingent consideration obligation Business Combination, Contingent Consideration, Liability Revenues Revenue [Policy Text Block] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Shares purchased (in shares) Stockholders' Equity, Share Exchange, Shares Purhcased Stockholders' Equity, Share Exchange, Shares Purhcased Dividends Payable [Table] Dividends Payable [Table] Weighted-Average Grant-Date Fair Value Per RSU Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Net income (loss) per share of Class A common stock: Earnings Per Share [Abstract] Performance fee-related compensation: Share-Based Payment Arrangement, Recognized Amount [Abstract] Equity [Abstract] Retained earnings (accumulated deficit) Retained Earnings (Accumulated Deficit) Tax Receivable Agreements Tax Receivable Agreement, Policy [Policy Text Block] Tax Receivable Agreement, Policy Class of Stock [Domain] Class of Stock [Domain] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Net income (loss) Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest Schedule of Debt Obligations Schedule of Debt [Table Text Block] General, administrative and other General and Administrative Expense Change in deferred income taxes Deferred Income Taxes and Tax Credits Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Equity Awards Adjustments Equity Awards Adjustments [Member] Lease liabilities Total operating lease liabilities Operating Lease, Liability Underlying Securities Award Underlying Securities Amount Dividends declared Dividends, Common Stock, Cash Consolidated Funds Consolidated Funds [Member] Consolidated Funds Amendment Flag Amendment Flag Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Increase (Decrease) in Temporary Equity [Roll Forward] Increase (Decrease) in Temporary Equity [Roll Forward] Subsequent Events [Abstract] Series A 5.52% Notes Series A 5.52% Notes [Member] Series A 5.52% Notes General, Administrative and Other Selling, General and Administrative Expenses, Policy [Policy Text Block] Shares sold in offering (in shares) Sale of Stock, Number of Shares Issued in Transaction Less: Debt issuance costs Debt Issuance Costs, Net Debt Obligations Debt Disclosure [Text Block] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Senior notes issued Debt Instrument, Face Amount Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Entity Address, Postal Zip Code Entity Address, Postal Zip Code S 2025 Q1 Dividends S 2025 Q1 Dividends [Member] S 2025 Q1 Dividends Accounting for Differing Fiscal Periods Fiscal Period, Policy [Policy Text Block] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Changes in unrealized losses included in earnings related to financial liabilities as of reporting date Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) Other investing activities Payments for (Proceeds from) Other Investing Activities Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Auditor Name Auditor Name Forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Current: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Variable Interest Entity, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Property and equipment, estimated useful lives Property, Plant and Equipment, Useful Life Employee Stock Employee Stock [Member] Equity Method Investment, Nonconsolidated Investee [Axis] Equity Method Investment, Nonconsolidated Investee [Axis] Deferred tax effect resulting from equity transactions affecting ownership in the Partnership Adjustments To Additional Paid In Capital, Deferred Tax Effect Of Exchange Adjustments To Additional Paid In Capital, Deferred Tax Effect Of Exchange Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Denominator: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Total assets Assets Assets Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Commitments and contingencies (Note 15) Commitments and Contingencies Partnership and LLC interests Partnerships and LLC Interests [Member] Partnerships and LLC Interests Schedule of Reconciliation of the U.S. federal statutory income tax rate to the effective tax rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Termination Date Trading Arrangement Termination Date Schedule of Related Party Transactions, by Related Party [Table] Related Party Transaction [Table] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] FY2027 Lessee, Operating Lease, Liability, to be Paid, Year Two Spread on base commitment fee percentage if utilization less than 50% Line Of Credit Facility, Commitment Fee Percentage, Spread On Base If Utilization Less Than 50 Percent Line Of Credit Facility, Commitment Fee Percentage, Spread On Base If Utilization Less Than 50 Percent Other liabilities Other Liabilities Revenue from External Customers by Geographic Areas Revenue from External Customers by Geographic Areas [Table Text Block] Lease right-of-use assets, net and lease liabilities Increase (Decrease) In Lease Right Of Use Assets, Net Of Lease Liabilities Increase (Decrease) In Lease Right Of Use Assets, Net Of Lease Liabilities Debt Instrument [Axis] Debt Instrument [Axis] Net income (loss) attributable to StepStone Group Inc. Net income (loss) attributable to StepStone Group Inc. – Basic Net Income (Loss) Attributable to Parent Trading Arrangement: Trading Arrangement [Axis] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Variable Interest Entity, Not Primary Beneficiary, Legacy Entities Variable Interest Entity, Not Primary Beneficiary, Legacy Entities [Member] Variable Interest Entity, Not Primary Beneficiary, Legacy Entities Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Transaction agreement, exchange ratio Transaction Agreement, Exchange Ratio Transaction Agreement, Exchange Ratio 1 Month Term Secured Overnight Financing Rate (SOFR) 1 Month Term Secured Overnight Financing Rate (SOFR) [Member] 1 Month Term Secured Overnight Financing Rate (SOFR) Schedule of Investments of Consolidated Funds Consolidated Funds Investments [Table Text Block] Consolidated Funds Investments Entity File Number Entity File Number Performance-Based Restricted Stock Units Performance-Based Restricted Stock Units [Member] Performance-Based Restricted Stock Units Common stock, number of votes Common Stock, Number of Votes Common Stock, Number of Votes Consolidated Entities [Domain] Consolidated Entities [Domain] Noncontrolling Interest Noncontrolling Interest [Member] Schedule of Equity Method Investments [Line Items] Income Statement Income Statement [Abstract] Entity Address, Address Line One Entity Address, Address Line One Federal Current Federal Tax Expense (Benefit) Effect of foreign currency exchange rate changes Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations Changes to uncertain tax positions Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit Name Forgone Recovery, Individual Name Weighted-average remaining lease term for operating leases (in years) Operating Lease, Weighted Average Remaining Lease Term Investments Investment, Policy [Policy Text Block] Other non-cash activities Other Noncash Income (Expense) Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Deferred tax liabilities: Components of Deferred Tax Liabilities [Abstract] Amounts allocated to non-controlling interests Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] SPD SPD [Member] SPD Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Schedule of Rollforward of the Company's Shares of Common Stock Outstanding Since IPO Schedule of Stock by Class [Table Text Block] Increase in due to related parties, tax receivable agreements Increase (Decrease) In Due To Related Parties, Tax Receivable Agreements Increase (Decrease) In Due To Related Parties, Tax Receivable Agreements PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Adjustment to Compensation: Adjustment to Compensation [Axis] Less: Net income attributable to non-controlling interests Net Income (Loss) Attributable to Noncontrolling Interest Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table] Subsidiary or Equity Method Investee, Sale of Stock, Type [Table] Maximum exposure to loss Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Transaction agreement, notification period Transaction Agreement, Notification Period Transaction Agreement, Notification Period Performance Restricted Stock Units Performance Restricted Stock Units [Member] Performance Restricted Stock Units Return to provision adjustment Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Percent Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Related Party [Axis] Related and Nonrelated Parties [Axis] Basic (in shares) Weighted-average shares of Class A common stock outstanding – Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Increase in deferred tax assets due to exchange of partnership units for common stock Increase (Decrease) In Deferred Tax Assets, Exchange Of Partnership Units For Common Stock Increase (Decrease) In Deferred Tax Assets, Exchange Of Partnership Units For Common Stock Subsidiary, Sale of Stock [Line Items] Subsidiary, Sale of Stock [Line Items] Total stockholders’ equity Total stockholders' equity, beginning balance Total stockholders' equity, ending balance Equity Equity, Including Portion Attributable to Noncontrolling Interest Name Awards Close in Time to MNPI Disclosures, Individual Name Revenue Benchmark Revenue Benchmark [Member] Entity Filer Category Entity Filer Category Fed Funds Effective Rate Overnight Index Swap Rate Fed Funds Effective Rate Overnight Index Swap Rate [Member] Proceeds from revolving credit facility Proceeds from Long-Term Lines of Credit Reclassification of non-controlling interests in subsidiaries from redeemable equity Reclassification to permanent equity Reclassifications of Temporary to Permanent Equity Statistical Measurement [Domain] Statistical Measurement [Domain] Components of Lease Expense and Supplemental Cash Flow Information Lease, Cost [Table Text Block] Compensation and benefits: Income Statement Compensation Expense Items [Abstract] All Trading Arrangements All Trading Arrangements [Member] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Schedule of Reconciliations of Basic and Diluted Earnings Per Share of Class A Common Stock Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Consolidated VIEs Variable Interest Entity, Primary Beneficiary [Member] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Other Commitments [Line Items] Other Commitments [Line Items] Class A Common Stock Class A common stock, $0.001 par value, 650,000,000 authorized; 76,761,399 and 65,614,902 issued and outstanding as of March 31, 2025 and 2024, respectively Class A Common Stock Common Class A [Member] Total equity method investments Equity Method Investments Pay vs Performance Disclosure [Line Items] Redeemable non-controlling interests in Consolidated Funds Beginning balance Ending balance Redeemable Noncontrolling Interest, Equity, Carrying Amount Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Deferred: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Other Performance Measure, Amount Other Performance Measure, Amount 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Three Schedule of Unvested Restricted Stock Units Activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Common stock, shares outstanding (in shares) Common stock, shares outstanding, beginning balance (in shares) Common stock, shares outstanding, ending balance (in shares) Common Stock, Shares, Outstanding Subsidiary of Limited Liability Company or Limited Partnership [Line Items] Subsidiary of Limited Liability Company or Limited Partnership [Line Items] Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Operating lease cost Operating Lease, Cost Number of shares available for grant (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Purchase of non-controlling interests Redemption of redeemable non-controlling interests Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Reclassification and adjustment of non-controlling interests in subsidiaries to redeemable equity at redemption value Reclassification and adjustment of non-controlling interests in subsidiaries to redeemable equity at redemption value Reclassification from permanent equity at redemption value Reclassifications Of Permanent Equity To Temporary Equity And Adjustment To Redemption Value Reclassifications Of Permanent Equity To Temporary Equity And Adjustment To Redemption Value Number of cities for leased offices Lessee, Operating Lease, Number Of Cities Lessee, Operating Lease, Number Of Cities Entity Tax Identification Number Entity Tax Identification Number StepStone Funds StepStone Funds [Member] StepStone Funds Schedule of Finite-Lived Intangible Assets [Table] Intangible Asset, Finite-Lived [Table] Foreign Deferred Foreign Income Tax Expense (Benefit) Income Based Incentive Fees Income Based Incentive Fees [Member] Income Based Incentive Fees Net income (loss) per share of Class A common stock: Earnings Per Share Reconciliation [Abstract] Deferred tax assets: Deferred Tax Assets, Net [Abstract] Cash-based incentive awards granted, value Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount Plan Name [Axis] Plan Name [Axis] Equity Components [Axis] Equity Components [Axis] Incremental income from assumed vesting of units Dilutive Securities, Effect on Basic Earnings Per Share, Options and Restrictive Stock Units Due from Affiliates Related Party Transactions [Policy Text Block] Related Party Transactions Fees and Accounts Receivable Accounts Receivable [Policy Text Block] Class C Partnership Unit Class C Partnership Unit [Member] Class C Partnership Unit Balance, beginning of period: Balance, end of period: Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Total expenses Expenses Costs and Expenses Amounts receivable from StepStone Funds Other Receivables, StepStone Funds [Member] Other Receivables, StepStone Funds Revenue, carried interest allocation, minimum return levels required Revenue, Carried Interest Allocation, Minimum Return Levels Required Revenue, Carried Interest Allocation, Minimum Return Levels Required Investments [Domain] Investments [Domain] Number of additional annual exchanges Transaction Agreement, Number of Additional Annual Exchanges Transaction Agreement, Number of Additional Annual Exchanges Percentage of carried interest allocation revenue awarded to employees as part of the long-term incentive compensation plan Revenue, Carried Interest Allocation, Employee Compensation, Percentage Revenue Carried Interest Allocation, Awarded To Employees, Percentage Legacy Greenspring performance fee-related compensation Legacy Performance Fee-Related Compensation Related to Carried Interest Allocation Legacy Performance Fee-Related Compensation Related to Carried Interest Allocation Geographical [Axis] Geographical [Axis] Net deferred tax assets Deferred Tax Assets, Net FY2030 Lessee, Operating Lease, Liability, to be Paid, Year Five Increase in valuation allowance Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Typical maximum equity interest held per fund Equity Method Investment, Equity Interest Per Fund, Percentage, Maximum Equity Method Investment, Equity Interest Per Fund, Percentage, Maximum Shares purchased (in shares) Class A common stock issued under ESPP (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans One Investments One Investments [Member] One Investments Cash, cash equivalents and restricted cash at beginning of period Cash, cash equivalents and restricted cash at end of period Total cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Realized Carried Interest Allocation, Realized [Member] Carried Interest Allocation, Realized Unrecognized non-cash compensation Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Foreign Current Foreign Tax Expense (Benefit) Performance Fees Performance Fees [Member] Performance Fees Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Product and Service [Domain] Product and Service [Domain] Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Fair Value Disclosures [Abstract] Changes in unrealized losses included in earnings related to financial liabilities as of reporting date Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) Preferred stock, outstanding (in shares) Preferred Stock, Shares Outstanding Gain on remeasurement of lease liabilities Gain on remeasurement of lease liabilities Gain (Loss) On Remeasurement Of Lease Liabilities Gain (Loss) On Remeasurement Of Lease Liabilities Security Exchange Name Security Exchange Name Basis spread on variable interest rate Debt Instrument, Basis Spread on Variable Rate Cash paid for amounts included in the measurement of lease liabilities: Cash Paid For Amounts Included In The Measurement Of Lease Liabilities [Abstract] Cash Paid For Amounts Included In The Measurement Of Lease Liabilities Management and advisory fees, net Management And Advisory Fees, Net [Member] Management And Advisory Fees, Net Related Party Transaction [Domain] Related Party Transaction [Domain] Amounts receivable from employees Other Receivables, Employees [Member] Other Receivables, Employees Eurodollar Eurodollar [Member] Number of RSUs Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] State and local Current State and Local Tax Expense (Benefit) Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Schedule of Common Stock Outstanding [Roll Forward] Schedule of Common Stock Outstanding [Roll Forward] Schedule of Common Stock Outstanding Net realized gains on investments Realized Investment Gains (Losses) Unrealized carried interest allocations and investment (income) loss Carried Interest Allocation And Investment Income, Unrealized Gain (Loss) Carried Interest Allocation And Investment Income, Unrealized Gain (Loss) Goodwill and Intangible Assets Disclosure [Abstract] Common stock, shares issued (in shares) Common Stock, Shares, Issued Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Equity method investment, total accrued carried interest allocation percentage Concentration Risk, Percentage Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Less: Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Compensation and Benefits Compensation Related Costs, Policy [Policy Text Block] Fees and accounts receivable Accounts Receivable, after Allowance for Credit Loss Common stock, shares authorized (in shares) Common Stock, Shares Authorized Underwritten Public Offering Underwritten Public Offering [Member] Underwritten Public Offering Transfers into Level III Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Distributions payable to certain employee equity holders of consolidated subsidiaries Other Liabilities, Distributions Payable [Member] Other Liabilities, Distributions Payable Entity Voluntary Filers Entity Voluntary Filers Interest expense Interest Expense, Nonoperating Total deferred income tax expense (benefit) Deferred Income Tax Expense (Benefit) Property and Equipment Property, Plant and Equipment Disclosure [Text Block] Payments for acquisition-related contingent consideration Payment for Contingent Consideration Liability, Financing Activities Fair Value, Recurring Fair Value, Recurring [Member] Maximum share purchase (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Number of Shares Per Employee Noncontrolling interest, ownership by parent Subsidiary, Ownership Percentage, Parent Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Other liabilities and payables Increase (Decrease) in Other Operating Liabilities Debt obligations Total debt obligations Long-Term Debt Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Plan assets Defined Benefit Plan, Plan Assets, Amount Legacy Greenspring investment loss Legacy Greenspring investment loss Legacy Investment Income Legacy Investment Income Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Class A common stock issued for vesting of RSUs (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Document Annual Report Document Annual Report Vested (in shares) Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Performance period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Performance Period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Performance Period Amortization of intangible assets Amortization of Intangible Assets Deferred revenue Contract with Customer, Liability Deferred financing costs Payments of Financing Costs Non-U.S. countries Non-US [Member] Accounting Policies [Abstract] Revenues Revenues [Abstract] Unrealized Carried Interest Allocation, Unrealized [Member] Carried Interest Allocation, Unrealized Leasehold improvements Leasehold Improvements [Member] Percentage of total net cash savings retained Incremental Net Cash Tax Savings Due To Exchanging Limited Partners, Benefit Retained, Percent Incremental Net Cash Tax Savings Due To Exchanging Limited Partners, Benefit Retained, Percent Less: Net income attributable to redeemable non-controlling interests Net income Net Income (Loss) Attributable to Redeemable Noncontrolling Interest Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Current Fiscal Year End Date Current Fiscal Year End Date Less: Imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Class B units issuable pursuant to anti-dilution rights in connection with the vesting of Class B2 units (in shares) Stockholders' Equity, Stock Issuable Pursuant To Anti-Dilution Rights Stockholders' Equity, Stock Issuable Pursuant To Anti-Dilution Rights Purchases of investments of Consolidated Funds Payments To Acquire Consolidated Funds Payments To Acquire Consolidated Funds EURIBOR Rate Multiplied By Statutory Reserve Rate Euro Interbank Offer Rate Multiplied By Statutory Reserve Rate [Member] Euro Interbank Offer Rate Multiplied By Statutory Reserve Rate PEO Name PEO Name Vesting [Axis] Vesting [Axis] Award Type [Domain] Award Type [Domain] Proceeds from capital contributions Proceeds From Capital Contributions From Non-Controlling Interests Proceeds From Capital Contributions From Non-Controlling Interests Increase in deferred tax asset Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-Based Compensation Cost Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Deferred income tax assets Deferred Income Tax Assets, Net Non-PEO NEO Non-PEO NEO [Member] Annual percentage of equity interests to be exchanged Stockholder's Equity, Transaction Agreement, Annual Portion Of Equity Interests To Be Exchanged Stockholder's Equity, Transaction Agreement, Annual Portion Of Equity Interests To Be Exchanged Finite-lived intangible assets, estimated useful lives Finite-Lived Intangible Asset, Useful Life Partnership interests grant date fair value (in dollars) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Granted in Period, Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Granted in Period, Fair Value Additional Paid-in Capital Additional Paid-in Capital [Member] Investments of Consolidated Funds Investments of consolidated funds Investments Of Consolidated Funds Investments Of Consolidated Funds Cash-based compensation Compensation Expense, Cash Based Compensation And Benefits Compensation Expense, Cash Based Compensation And Benefits Employee Benefits Retirement Benefits [Text Block] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Class of Stock [Axis] Class of Stock [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Less: Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Name Measure Name Entity Interactive Data Current Entity Interactive Data Current Contingent consideration paid Business Combination, Contingent Consideration, Amount Paid Business Combination, Contingent Consideration, Amount Paid Management contracts Management Contracts [Member] Management Contracts Number of operating segments Number of Operating Segments Incentive fees as percentage of profits Revenue From Contract With Customer, Incentive Fees As Percentage Of Net Investment Income Revenue From Contract With Customer, Incentive Fees As Percentage Of Net Investment Income Taxes paid Income Taxes Paid New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Accounts payable, accrued expenses and other liabilities Increase (Decrease) in Other Accounts Payable and Accrued Liabilities Minimum management fees payable Debt Instrument, Covenants, Minimum Management Fees Payable Debt Instrument, Covenants, Minimum Management Fees Payable Business combination, contingent consideration, liability, measurement input Business Combination, Contingent Consideration, Liability, Measurement Input Equity-based compensation Share-Based Payment Arrangement, Noncash Expense Total net deferred tax assets Deferred Tax Assets, Net of Valuation Allowance Fair Value Measured at Net Asset Value Per Share Fair Value Measured at Net Asset Value Per Share [Member] Share-based Payment Arrangement, Tranche Two Share-Based Payment Arrangement, Tranche Two [Member] Unrealized gain on defined benefit plan, net Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Investment income of Consolidated Funds Income (Loss) From Consolidated Funds Income (Loss) From Consolidated Funds Additions Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases Senior notes, interest rate Debt Instrument, Interest Rate, Stated Percentage Supplemental disclosures: Supplemental Cash Flow Information [Abstract] Net income (loss) attributable to StepStone Group Inc. – Diluted Net Income (Loss) Available to Common Stockholders, Diluted Liability classified awards Liability Classified Award [Member] Liability Classified Award Total other income (expense) Nonoperating loss Nonoperating Income (Expense) Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Auditor Firm ID Auditor Firm ID Effective tax rate Effective Income Tax Rate Reconciliation, Percent Variable Rate [Domain] Variable Rate [Domain] Equity method investments: Equity Method Investment, Financial Statement, Reported Amounts [Abstract] Income tax decrease (increase) Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Separately Managed Account Concentration Risk Separately Managed Account Concentration Risk [Member] Separately Managed Account Concentration Risk Number of reportable segments Number of Reportable Segments Total liabilities and stockholders’ equity Liabilities and Equity Subsequent Events Subsequent Events [Text Block] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Equity increase Adjustments To Additional Paid In Capital, Increase In Deferred Tax Assets Valuation Allowance Adjustments To Additional Paid In Capital, Increase In Deferred Tax Assets Valuation Allowance Conversion of stock, conversion basis (in shares) Conversion Of Stock, Conversion Basis Conversion Of Stock, Conversion Basis Issuance of note related to sale of subsidiary Noncash or Part Noncash Divestiture, Amount of Consideration Received Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] Interest income Investment Income, Interest Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Legacy Funds Legacy Funds [Member] Legacy Funds Redemption of redeemable non-controlling interests in subsidiaries Redeemable Noncontrolling Interest, Increase From Redemption Redeemable Noncontrolling Interest, Increase From Redemption Establishment of lease liabilities in exchange for lease right-of-use assets Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Underlying Security Market Price Change Underlying Security Market Price Change, Percent Measurement Input Type [Axis] Measurement Input Type [Axis] Individual: Individual [Axis] Accumulated Other Comprehensive Income Accumulated other comprehensive income AOCI Attributable to Parent [Member] Dividends [Domain] Dividends [Domain] Product and Service [Axis] Product and Service [Axis] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Statement [Line Items] Statement [Line Items] Measurement Input Type [Domain] Measurement Input Type [Domain] Schedule of Related Party Transactions Schedule of Related Party Transactions [Table Text Block] Due to affiliates Accounts Payable, Other SMAs Incentive Fees, Separately Managed Accounts [Member] Incentive Fees, Separately Managed Accounts Schedule of Property and equipment Property, Plant and Equipment [Table Text Block] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Sublease income Sublease Income Balance, beginning of period: Balance, end of period: Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Partnership and LLC interests Partnership and LLC Interests [Member] Partnership and LLC Interests Minimum Minimum [Member] Adoption Date Trading Arrangement Adoption Date Related Party Transactions [Abstract] Due from affiliates Due from affiliates, net Other Receivables Exchange One Exchange One [Member] Exchange One Settlement of non-controlling interests related to awards of carried interest allocations Noncontrolling Interest, Increase From Settlement Of Non-Controlling Interests Related To Awards Of Carried Interest Allocations Noncontrolling Interest, Increase From Settlement Of Non-Controlling Interests Related To Awards Of Carried Interest Allocations Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Incentive fees Total incentive fees Incentive Fees [Member] Incentive Fees Federal tax at statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Audit Information [Abstract] Audit Information Total remaining principal Long-Term Debt, Gross Distributions received from investments Proceeds from Equity Method Investment, Distribution, Return of Capital Exercise Price Award Exercise Price Schedule of Components of deferred tax assets and liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Accrued compensation and benefits Increase (Decrease) in Employee Related Liabilities Arrangement Duration Trading Arrangement Duration Intangibles and Goodwill Goodwill and Intangible Assets Disclosure [Text Block] Schedule of Variable Interest Entities [Table] Variable Interest Entity [Table] Non-Controlling Interests in Subsidiaries Subsidiaries [Member] Investments, at fair value Investments Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Debt instrument, term Debt Instrument, Term 2029 Finite-Lived Intangible Asset, Expected Amortization, Year Four All Individuals All Individuals [Member] Temporary Equity [Line Items] Temporary Equity [Line Items] Fund Credit Facility Fund Credit Facility [Member] Fund Credit Facility Variable Rate [Axis] Variable Rate [Axis] Income Tax Disclosure [Abstract] Entities [Table] Entities [Table] Other income (loss) Other Nonoperating Income (Expense) Intangibles, net Intangible Assets, Net (Excluding Goodwill) Investment in fund, before eliminations Investment In Fund, Before Eliminations Investment In Fund, Before Eliminations Remeasurement of lease liabilities Remeasurement Of Lease Liabilities Remeasurement Of Lease Liabilities Profits interests percent Share-Based Compensation Arrangement By Share-Based Payment Award, Profits Interest Share-Based Compensation Arrangement By Share-Based Payment Award, Profits Interest Shares redeemed (in shares) Stock Redeemed or Called During Period, Shares Related Party [Domain] Related and Nonrelated Parties [Domain] Changes in liability fair value hierarchy levels Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net Percentage of total net cash savings due to exchanging limited partners Incremental Net Cash Tax Savings Due To Exchanging Limited Partners, Percent Incremental Net Cash Tax Savings Due To Exchanging Limited Partners, Percent Fund reimbursement revenues Management And Advisory Fees, Net, Fund Reimbursement Revenues [Member] Management And Advisory Fees, Net, Fund Reimbursement Revenues Class A2 Interests Class A2 Interests [Member] Class A2 Interests Liability Class [Axis] Liability Class [Axis] Net unrealized gains on investments Unrealized Gain (Loss) on Investments Foreign taxes Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Other assets and receivables Other assets and receivables Increase (Decrease) in Other Operating Assets Statement of Partners' Capital [Abstract] Unrealized gain (loss) on defined benefit plan, net Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Accrued carried interest allocations Equity Method Investments, Accrued Carried Interest Allocations Equity Method Investments, Accrued Carried Interest Allocations Federal Deferred Federal Income Tax Expense (Benefit) Cash, Cash Equivalents and Restricted Cash Cash and Cash Equivalents, Policy [Policy Text Block] Two Investments Two Investments [Member] Two Investments Impairment charges, finite-lived intangible assets Impairment of Intangible Assets, Finite-Lived Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Thereafter Finite-Lived Intangible Asset, Expected Amortization, after Year Five Proceeds from sale of investments of Consolidated Funds Proceeds From Sale of Consolidated Funds Proceeds From Sale of Consolidated Funds Property and equipment impairment Impairment, Long-Lived Asset, Held-for-Use Measure: Measure [Axis] Asset Class [Domain] Asset Class [Domain] Investments: Investments [Abstract] Preferred stock, authorized (in shares) Preferred Stock, Shares Authorized O 2025 Q1 Dividends O 2025 Q1 Dividends [Member] O 2025 Q1 Dividends Accrued carried interest-related compensation Equity Method Investment, Accrued Carried Interest Related Compensation Payable Equity Method Investment, Accrued Carried Interest Related Compensation Payable Entity Emerging Growth Company Entity Emerging Growth Company Total liabilities Liabilities, Fair Value Disclosure Equity reallocation between controlling and non-controlling interests Adjustments To Additional Paid In Capital, Reallocation Of Noncontrolling Interest Adjustments To Additional Paid In Capital, Reallocation Of Noncontrolling Interest Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Legacy Greenspring investments in funds and accrued carried interest allocations Legacy Investments In Funds And Accrued Carried Interest Allocations Legacy Investments In Funds And Accrued Carried Interest Allocations Shares available for issuance as consideration (in shares) Stockholder's Equity, Transaction Agreements, Shares Available For Issuance As Consideration Stockholder's Equity, Transaction Agreements, Shares Available For Issuance As Consideration Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Equity Component [Domain] Equity Component [Domain] Reconciliation of cash, cash equivalents and restricted cash: Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents [Abstract] Legacy gross carried interest allocation, focused comingled funds Legacy Gross Carried Interest Allocation, Focused Commingled Funds [Member] Legacy Gross Carried Interest Allocation, Focused Commingled Funds Adjustments to reconcile net income (loss) to net cash provided by operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Membership ownership percentage Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest Fair value adjustment for acquisition-related contingent consideration Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Changes in assets fair value hierarchy levels Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net Entity Shell Company Entity Shell Company Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Accumulated Other Comprehensive Income Comprehensive Income, Policy [Policy Text Block] Schedule of Dividends Dividends Declared [Table Text Block] Statement [Table] Statement [Table] Measurement Frequency [Domain] Measurement Frequency [Domain] Counterparty Name [Axis] Counterparty Name [Axis] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Schedule of Carrying Value of the Assets and Liabilities of the Company's Variable Interest Entities Schedule of Variable Interest Entities [Table Text Block] Numerator: Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] Private Wealth Funds Private Wealth Funds [Member] Private Wealth Funds Deferred tax effect resulting from transactions affecting ownership in the Partnership, including net amounts payable under Tax Receivable Agreements Deferred Tax Effect From Purchase Of Units, Net Deferred Tax Effect From Purchase Of Units, Net Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activities Level I Fair Value, Inputs, Level 1 [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Statement of Cash Flows [Abstract] Senior Notes Senior Notes [Member] Non-cash operating, investing, and financing activities: Noncash Investing and Financing Items [Abstract] Schedule of Long-Term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Economic interest Economic Ownership Interest Economic Ownership Interest Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Income Taxes Income Tax Disclosure [Text Block] Consolidated Entities, Excluding Legacy Entities Consolidated Entities, Excluding Legacy Entities [Member] Consolidated Entities, Excluding Legacy Entities FY2029 Lessee, Operating Lease, Liability, to be Paid, Year Four Payments on revolving credit facility Repayments of Long-Term Lines of Credit Organization, Consolidation and Presentation of Financial Statements [Abstract] Weighted-average discount rate for operating leases Operating Lease, Weighted Average Discount Rate, Percent Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Contributions from redeemable non-controlling interests in Consolidated Funds Adjustments To Reconcile Net Income (Loss) To Cash Provided By (Used In) Financing Activities [Abstract] Adjustments To Reconcile Net Income (Loss) To Cash Provided By (Used In) Financing Activities Focused commingled funds Incentive Fees, Focused Commingled Funds [Member] Incentive Fees, Focused Commingled Funds Credit Facility [Axis] Credit Facility [Axis] Other Income (Expense) Other Income And Other Expense [Policy Text Block] Other Income And Other Expense Entity Registrant Name Entity Registrant Name Accounts payable, accrued expenses and other liabilities Accounts Payable and Other Accrued Liabilities Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Depreciation and amortization Depreciation, Depletion and Amortization Carried Interest Allocations Carried Interest Allocation [Member] Carried Interest Allocation Equity method investments Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] State and local Deferred State and Local Income Tax Expense (Benefit) Fair Value as of Grant Date Award Grant Date Fair Value Class A common stock issued in exchange for Class B and Class C partnership units (in shares) Stockholders' Equity, Units Exchanged In Offering, Shares Stockholders' Equity, Units Exchanged In Offering, Shares Affiliated Entity Affiliated Entity [Member] Three Investments Three Investments [Member] Three Investments Level II Fair Value, Inputs, Level 2 [Member] Payments to related parties under Tax Receivable Agreements Payments to related partied under Tax Receivable Agreements Payments To Related Parties, Tax Receivable Agreements Payments To Related Parties, Tax Receivable Agreements Stockholders’ equity: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Geographical [Domain] Geographical [Domain] Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Consolidation Consolidation, Policy [Policy Text Block] Distributions to non-controlling interests Payments of Ordinary Dividends, Noncontrolling Interest Restatement Determination Date: Restatement Determination Date [Axis] Title of 12(b) Security Title of 12(b) Security Concentration Risk Type [Axis] Concentration Risk Type [Axis] Common stock Common Stock, Value, Issued Class B common stock purchased at par value in connection with vesting of Class B2 units (in shares) Stockholders' Equity, Stock Purchased At Par Value In Connection With Vesting of Class B2 Units Stockholders' Equity, Stock Purchased At Par Value In Connection With Vesting of Class B2 Units Document Financial Statement Error Correction Document Financial Statement Error Correction [Flag] Purchase period Share-Based Compensation Arrangement By Share-based Payment Award, Purchase Period Share-Based Compensation Arrangement By Share-based Payment Award, Purchase Period Share-Based Payment Arrangement [Abstract] State and local income tax Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Other Deferred Tax Assets, Other Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Comingled Funds Concentration Risk Comingled Funds Concentration Risk [Member] Comingled Funds Concentration Risk Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Total deferred tax liabilities Deferred Tax Liabilities, Gross Basic (in dollars per share) Basic (in dollars per share) Earnings Per Share, Basic Proceeds from issuance of Class A common stock of shares under ESPP Proceeds from Issuance of Common Stock Operating cash flows used for operating leases Operating Lease, Payments Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Schedule of Product Information [Table] Nature of Operation, Product Information, Concentration of Risk [Table] Investment in the Partnership Deferred Tax Assets, Investments Ownership [Domain] Ownership [Domain] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Dividends Payable [Line Items] Dividends Payable [Line Items] O 2024 Q1 Dividends O 2024 Q1 Dividends [Member] O 2024 Q1 Dividends Property and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Concentrations of Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] 2026 Finite-Lived Intangible Asset, Expected Amortization, Year One Equity Method Investment, Nonconsolidated Investee [Domain] Equity Method Investment, Nonconsolidated Investee [Domain] Contributions Noncontrolling Interest, Increase from Subsidiary Equity Issuance Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Business Combinations Business Combinations Policy [Policy Text Block] Investments Equity Method Investments and Joint Ventures Disclosure [Text Block] Total revenues Revenues Equity-Based Compensation Share-Based Payment Arrangement [Text Block] Class B2 units Class B2 Unit [Member] Class B2 Unit Entity Address, City or Town Entity Address, City or Town Leases Lessee, Leases [Policy Text Block] Legacy Greenspring accrued carried interest-related compensation Legacy Investment, Accrued Carried Interest Related Compensation Payable Legacy Investment, Accrued Carried Interest Related Compensation Payable Partner Type [Axis] Partner Type [Axis] Dividends [Axis] Dividends [Axis] Equity-based compensation Share-Based Payment Arrangement, Expense Exchange of units Stock Issued During Period, Value, Conversion of Convertible Securities Other Commitments [Table] Other Commitments [Table] Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Schedule of Intangible Assets, Net Schedule of Finite-Lived Intangible Assets [Table Text Block] Number of annual exchanges Transaction Agreement, Number of Annual Exchanges Transaction Agreement, Number of Annual Exchanges Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Revenues Revenue from Contract with Customer [Text Block] Document Fiscal Year Focus Document Fiscal Year Focus Due to affiliates Increase (Decrease) in Due to Related Parties Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Total assets Assets, Fair Value Disclosure Foreign income before income tax Income (Loss) from Continuing Operations before Income Taxes, Foreign 2030 Finite-Lived Intangible Asset, Expected Amortization, Year Five Document Period End Date Document Period End Date Sale of Stock [Axis] Sale of Stock [Axis] Proceeds from sale of non-controlling interests Contributions from redeemable non-controlling interests in Consolidated Funds Proceeds from Noncontrolling Interests Carried interest allocation as percentage of cumulative fund or account performance Revenue, Carried Interest Allocation As Percentage Of Cumulative Fund Or Account Performance Revenue, Carried Interest Allocation As Percentage Of Cumulative Fund Or Account Performance Total lease liabilities Lessee, Operating Lease, Liability, to be Paid Class Of Partnership Unit [Domain] Class Of Partnership Unit [Domain] Class Of Partnership Unit [Domain] RSUs, beginning balance (in shares) RSUs, ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Asset Class [Axis] Asset Class [Axis] Insider Trading Arrangements [Line Items] Due from affiliates Increase (Decrease) in Due from Related Parties FY2028 Lessee, Operating Lease, Liability, to be Paid, Year Three Deferred revenue, revenue recognized Contract with Customer, Liability, Revenue Recognized Exchange Three Exchange Three [Member] Exchange Three Document Transition Report Document Transition Report Schedule of Noncontrolling Interests In Consolidated Funds Redeemable Noncontrolling Interest [Table Text Block] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Entity Current Reporting Status Entity Current Reporting Status Retained Earnings Retained Earnings [Member] Amortization of deferred financing costs Amortization of Debt Issuance Costs Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Non-Controlling Interests Consolidation, Subsidiaries or Other Investments, Consolidated Entities, Policy [Policy Text Block] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Executive Category: Executive Category [Axis] Spread on base commitment fee percentage if utilization greater than 50% Line Of Credit Facility, Commitment Fee Percentage, Spread On Base If Utilization Greater Than 50 Percent Line Of Credit Facility, Commitment Fee Percentage, Spread On Base If Utilization Greater Than 50 Percent Schedule of Components of provision for income taxes Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Letters of credit Letter of Credit [Member] Equity issued for redemption of redeemable non-controlling interests Stock Issued For Acquisitions Stock Issued For Acquisitions Company Selected Measure Name Company Selected Measure Name