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Joint Venture - Additional Information (Detail) - Roblox China Holding Corp
$ in Millions
Feb. 28, 2019
USD ($)
Schedule of Equity Method Investments [Line Items]  
Equity method investment ownership percentage 51.00%
Songhua River Investment Limited  
Schedule of Equity Method Investments [Line Items]  
Contribution by non controlling interest to the joint venture $ 50
Minority interest percentage in joint venture 49.00%