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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] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Remained of FY2023 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 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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 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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 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 decrease 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 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Interest [Abstract] Noncontrolling Interest Noncontrolling Interest [Member]