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Investment, Accrued Carried Interest Related Compensation Payable Distributions Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Accounts payable, accrued expenses and other liabilities Accounts Payable and Other Accrued Liabilities Equity-Based Compensation Compensation Related Costs, Policy [Policy Text Block] Investments: Investments [Abstract] Minimum Minimum [Member] Denominator: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Exercise Price Award Exercise Price Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] 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 Common Class B Member, Issuable In Connection With Vesting Of Class B2 Units Common Class B Member, Issuable In Connection With 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Payment, Tax Withholding, Share-Based Payment Arrangement Accounting for Differing Fiscal Periods Fiscal Period, Policy [Policy Text Block] Changes in unrealized (gains) losses included in earnings related to financial instruments still held at the reporting date Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) Net income (loss) Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Deferred income tax assets Deferred Income Tax Assets, Net Additions Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases 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 Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Retained Earnings Retained Earnings [Member] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Total liabilities and stockholders’ equity Liabilities and Equity Other income (expense) Nonoperating Income (Expense) [Abstract] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Ownership [Domain] Ownership [Domain] Changes in fair value hierarchy levels Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net Basic (in dollars per share) Basic (in dollars per share) Earnings Per Share, Basic Lease right-of-use assets, net Operating Lease, Right-of-Use Asset Accounting Policies [Abstract] Service agreements Service Agreements [Member] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Sale of Stock [Domain] Sale of Stock [Domain] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Remainder of FY2024 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Performance fee-related compensation: Share-Based Payment Arrangement, Recognized Amount [Abstract] Net income (loss) attributable to StepStone Group Inc. – Diluted Net Income (Loss) Available to Common Stockholders, Diluted Arrangement Duration Trading Arrangement Duration 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 Entity Address, City or Town Entity Address, City or Town Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Related Party Related Party [Member] Class C Common Stock Common Class C [Member] Consolidation Consolidation, Policy [Policy Text Block] Document Transition Report Document Transition Report Award Timing Predetermined Award Timing Predetermined [Flag] Termination Date Trading Arrangement Termination Date Common stock, shares authorized (in shares) Common Stock, Shares Authorized Economic interest Economic Ownership Interest Economic Ownership Interest Consolidated Entities, Excluding Legacy Entities Consolidated Entities, Excluding Legacy Entities [Member] Consolidated Entities, Excluding Legacy Entities Proceeds from sale of non-controlling interests Contributions from redeemable non-controlling interests in Consolidated Funds Proceeds from Noncontrolling Interests Secured Overnight Financing Rate (SOFR) Secured Overnight Financing Rate (SOFR) [Member] Secured Overnight Financing Rate (SOFR) 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] Tax Receivable Agreements Tax Receivable Agreement, Policy [Policy Text Block] Tax Receivable Agreement, Policy Decrease in valuation allowance Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Revolver Long-Term Debt, Gross Liability Class [Axis] Liability Class [Axis] Related Party Transactions [Abstract] All Trading Arrangements All Trading Arrangements [Member] Measurement Input Type [Axis] Measurement Input Type [Axis] Membership ownership percentage Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest All Adjustments to Compensation All Adjustments to Compensation [Member] Award Timing Disclosures [Line Items] Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Cash flows from financing activities of 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, Consolidated Funds Focused commingled funds Incentive Fees, Focused Commingled Funds [Member] Incentive Fees, Focused Commingled Funds Compensation Amount Outstanding Recovery Compensation Amount Consolidated Funds Consolidated Funds [Member] Consolidated Funds Additional paid-in capital Additional Paid in Capital Net income (loss) Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Carried interest allocations Carried Interest Allocation [Member] Carried Interest Allocation 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 Subsequent Event Type [Axis] Subsequent Event Type [Axis] 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 Statement of Comprehensive Income [Abstract] Three Investments Three Investments [Member] Three Investments Incremental income from assumed vesting and exchange of restricted share units and Class B units Dilutive Securities, Effect on Basic Earnings Per Share, Options and Restrictive Stock Units Payments to related parties under Tax Receivable Agreements Payments to related parties under Tax Receivable Agreements Payments To Related Parties, Tax Receivable Agreements Payments To Related Parties, Tax Receivable Agreements Income Taxes Income Tax, Policy [Policy Text Block] FY2027 Finite-Lived Intangible Asset, Expected Amortization, Year Three Forfeited (in shares) Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Contributed capital Partners' Capital Account, Contributions Insider Trading Arrangements [Line Items] Distributions received from investments Proceeds from Equity Method Investment, Distribution, Return of Capital Related Party [Axis] Related Party, Type [Axis] Other assets and receivables Other Assets Entity Registrant Name Entity Registrant Name Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Award Timing Method Award Timing Method [Text Block] Assumed vesting of RSUs and exchange of Class B2 units (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Other assets and receivables Increase (Decrease) in Other Operating Assets FY2026 Finite-Lived Intangible Asset, Expected Amortization, Year Two Adjustment to Compensation, Amount Adjustment to Compensation Amount Fair value adjustment for acquisition-related contingent consideration Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Non-controlling interests Less: Amounts attributable to non-controlling interests Equity, Attributable to Noncontrolling Interest Document Period End Date Document Period End Date Comingled Funds Concentration Risk Comingled Funds Concentration Risk [Member] Comingled Funds Concentration Risk Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Partner Type of Partners' Capital Account, Name [Domain] Partner Type of Partners' Capital Account, Name [Domain] Adoption Date Trading Arrangement Adoption Date Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Entity Central Index Key Entity Central Index Key Equity-based compensation Liability based awards, expense Share-Based Payment Arrangement, Expense Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Numerator: Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] Intangible assets, gross Finite-Lived Intangible Assets, Gross Income tax expense (benefit) Income Tax Expense (Benefit) Non-U.S. countries Non-US [Member] Deferred tax effect resulting from transactions affecting ownership in the Partnership, net of amounts payable under Tax Receivable Agreements Adjustments To Additional Paid In Capital, Deferred Tax Effect Of Exchange Adjustments To Additional Paid In Capital, Deferred Tax Effect Of Exchange Vested (in shares) Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Vested Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Vested Fair Value Measurements Fair Value Disclosures [Text Block] Number of operating segments Number of Operating Segments Revenue Benchmark Revenue Benchmark [Member] Name Trading Arrangement, Individual Name Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Amortization of deferred financing costs Deferred Debt Issuance Cost, Writeoff Equity [Abstract] Weighted-average remaining lease term for operating leases Operating Lease, Weighted Average Remaining Lease Term Revenues Revenue from contracts with customer Revenue from Contract with Customer, Excluding Assessed Tax Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Amendment Flag Amendment Flag Noncontrolling Interests In Consolidated Funds Redeemable Noncontrolling Interest [Table Text Block] Partnership and LLC interests Partnerships and LLC Interests [Member] Partnerships and LLC Interests Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Weighted-average discount rate for operating leases Operating Lease, Weighted Average Discount Rate, Percent Comprehensive income (loss) before non-controlling interests Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Credit Facility [Domain] Credit Facility [Domain] 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 Class B2 units Class B2 Unit [Member] Class B2 Unit Basis spread on variable interest rate Debt Instrument, Basis Spread on Variable Rate 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 Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [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 Diluted (in shares) Weighted-average shares of Class A common stock outstanding - Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [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 Revenues Revenue from Contract with Customer [Text Block] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Company Selected Measure Amount Company Selected Measure Amount 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 Additional Paid-in Capital Additional Paid-in Capital [Member] Total assets Total assets Assets Name Awards Close in Time to MNPI Disclosures, Individual Name Investment income (loss) Income (Loss) from Equity Method Investments Common stock, number of votes Common Stock, Number of Votes Common Stock, Number of Votes Cover [Abstract] Subsequent Events Subsequent Events [Text Block] Equity-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition United States UNITED STATES Fair Value, Recurring Fair Value, Recurring [Member] 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 Non-NEOs Non-NEOs [Member] Total lease liabilities Lessee, Operating Lease, Liability, to be Paid 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 Class Of Partnership Unit [Domain] Class Of Partnership Unit [Domain] Class Of Partnership Unit [Domain] Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Subsidiary, Sale of Stock [Line Items] Subsidiary, Sale of Stock [Line Items] 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] 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 Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] 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 Non-PEO NEO Non-PEO NEO [Member] Equity Component [Domain] Equity Component [Domain] Adjustment to Compensation: Adjustment to Compensation [Axis] Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Basic (in shares) Weighted-average shares of Class A common stock outstanding – Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Entity Current Reporting Status Entity Current Reporting Status Concentration Risk Type [Domain] Concentration Risk Type [Domain] Net Realized Gains (Losses) on Investments Realized Investment Gains (Losses) Reclassifications Reclassification, Comparability Adjustment [Policy Text Block] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Revenues Revenues [Abstract] Current Events Current Events [Policy Text Block] Current Events Consolidated Entities [Domain] Consolidated Entities [Domain] Product Information [Line Items] Product Information [Line Items] Related Party Transaction [Axis] Related Party Transaction [Axis] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Due to affiliates Increase (Decrease) in Due to Related Parties Statement [Line Items] Statement [Line Items] Exchange of Class B and Class C units for Class A common stock and redemption of corresponding Class B common shares Stock Issued During Period, Value, Conversion of Convertible Securities Partner Type [Axis] Partner Type [Axis] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount 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 Debt Obligations Schedule of Debt [Table Text Block] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Client relationships Customer Relationships [Member] Proceeds from revolving credit facility Proceeds from Long-Term Lines of Credit Stockholders’ equity: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Noncontrolling Interest Noncontrolling Interest [Member]