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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Numerator:    
Net income attributable to StepStone Group Inc. – Basic $ 41,650 $ 0
Net income attributable to StepStone Group Inc. – Diluted $ 45,537  
Denominator:    
Weighted-average shares of Class A common stock outstanding – Basic (in shares) 39,042,497  
Weighted-average shares of Class A common stock outstanding - Diluted (in shares) 42,885,231  
Earnings per share of Class A common stock:    
Basic (in dollars per share) $ 1.07  
Diluted (in dollars per share) $ 1.06  
Restricted Stock Units (RSUs)    
Numerator:    
Incremental income from assumed vesting and exchange of restricted share units and Class B units $ 1,378  
Denominator:    
Assumed vesting and exchange of Class B2 units (in shares) 1,353,755  
Class B Common Stock    
Numerator:    
Incremental income from assumed vesting and exchange of restricted share units and Class B units $ 2,509  
Denominator:    
Assumed vesting and exchange of Class B2 units (in shares) 2,488,979