Joint Venture - Additional Information (Detail) - Roblox China Holding Corp $ in Millions |
Feb. 28, 2019
USD ($)
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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% |