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CONTENT ASSETS - Schedule of Amortization of Content Assets (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2026 | Mar. 31, 2025
Capitalized Licensed Content Costs [Abstract] |  |
Licensed content | $ 36,033 | $ 37,661
Produced content | 9,714 | 10,383
Total amortization costs | $ 45,747 | $ 48,044

X
- Definition Amortization expense of content assets. + References No definition available. + Details
Name: | roku_AmortizationExpenseOfContentAssets
Namespace Prefix: | roku_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortization expense of licensed content assets. + References No definition available. + Details
Name: | roku_AmortizationExpenseOfLicensedContentAssets
Namespace Prefix: | roku_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortization expense of produced content assets. + References No definition available. + Details
Name: | roku_AmortizationExpenseOfProducedContentAssets
Namespace Prefix: | roku_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Capitalized licensed content costs. + References No definition available. + Details
Name: | roku_CapitalizedLicensedContentCostsAbstract
Namespace Prefix: | roku_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration