Overview and Summary of Significant Accounting Policies - Additional Information (Details)		3 Months Ended			12 Months Ended
		Jun. 30, 2024	Sep. 30, 2022	Mar. 31, 2022	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021	Jan. 31, 2023 robux	Jan. 31, 2022 robux	Jan. 30, 2022 robux
Disaggregation of Revenue [Line Items]
Average lifetime of a paying user			28 months	25 months		28 months		23 months
Increase in revenue					$ 98,000,000
Cost of revenue	[1]				801,162,000	$ 649,115,000	$ 547,658,000
Revenue					3,601,979,000	2,799,274,000	2,225,052,000
Restricted cash					$ 0	0
Payment remittance term (within)					30 days
Intangible asset, useful life (up to)					2 years 2 months 12 days
Developer exchange program, minimum virtual currency earned requirement | robux									30,000	50,000	100,000
Advertising cost					$ 45,400,000	38,300,000	36,200,000
Operating lease, renewal term (up to)					5 years
Net foreign exchange gains (losses)					$ (14,100,000)	$ (2,000,000.0)	$ (5,100,000)
Employee | NQDC Plan
Disaggregation of Revenue [Line Items]
Maximum percentage of salary					90.00%
Maximum granted, percentage					100.00%
Maximum percentage of cash bonus compensation					65.00%
Non-Employee Director Member | NQDC Plan
Disaggregation of Revenue [Line Items]
Maximum percentage of salary					100.00%
RSUs
Disaggregation of Revenue [Line Items]
Vesting period					4 years
One Distribution Channel | Accounts Receivable | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of revenue					29.00%	30.00%
One Distribution Channel | Revenue Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of revenue					30.00%	30.00%	32.00%
Second Distribution Channel | Accounts Receivable | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of revenue					26.00%	26.00%
Second Distribution Channel | Revenue Benchmark | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of revenue					16.00%	17.00%	18.00%
Minimum
Disaggregation of Revenue [Line Items]
Average lifetime of a paying user		28 months
Intangible asset, useful life (up to)					5 years
Maximum
Disaggregation of Revenue [Line Items]
Average lifetime of a paying user		27 months
Intangible asset, useful life (up to)					10 years
Operating lease term					12 years
Service Life
Disaggregation of Revenue [Line Items]
Cost of revenue					$ 20,400,000		$ (79,300,000)
Revenue							$ (344,900,000)

[1] Depreciation of servers and infrastructure equipment included in infrastructure and trust & safety.