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Document and Entity Information Document
Aug. 10, 2021
Cover [Abstract]  
Document Type 8-K
Document Period End Date Aug. 10, 2021
Entity Registrant Name STEPSTONE GROUP INC.
Entity Central Index Key 0001796022
Amendment Flag false
Entity Incorporation, State or Country Code DE
Entity File Number 001-39510
Entity Tax Identification Number 84-3868757
Entity Address, Address Line One 450 Lexington Avenue, 31st Floor
Entity Address, City or Town New York,
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10017
City Area Code 212
Local Phone Number 351-6100
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Class A common stock, par value $0.001 per share
Trading Symbol STEP
Security Exchange Name NASDAQ
Entity Emerging Growth Company true
Entity Ex Transition Period false