v3.24.1.u1

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Commitments And Contingencies [Line Items]
Unrecorded purchase commitment	$ 183,800
Letters of credit outstanding	37,500	$ 37,500
Manufacturing
Commitments And Contingencies [Line Items]
Purchase commitments for inventory and license	184,700
Content Publishers
Commitments And Contingencies [Line Items]
Purchase commitments for inventory and license	249,632
Content Publishers | Current Liabilities
Commitments And Contingencies [Line Items]
Purchase commitments for inventory and license	45,500
Content Publishers | Other Long-Term Liabilities
Commitments And Contingencies [Line Items]
Purchase commitments for inventory and license	$ 20,300

X

- Definition

Commitments and contingencies.

+ References

No definition available.

+ Details

Name:	roku_CommitmentsAndContingenciesLineItems
Namespace Prefix:	roku_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

+ References

No definition available.

+ Details

Name:	us-gaap_PurchaseObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 440
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482648/440-10-50-4

+ Details

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	srt_ProductOrServiceAxis=roku_ManufacturingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=roku_ContentPublishersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=roku_CurrentLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_OtherNoncurrentLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: