v3.24.1.u1

Leases - Additional Information (Details) $ in Millions	Mar. 31, 2024 USD ($)
Lessee Lease Description [Line Items]
Commitment relating to operating lease, that have not yet commenced	$ 0.0
Expected sublease receivable	$ 43.9
Sublease term	5 years 8 months 12 days
Minimum
Lessee Lease Description [Line Items]
Remaining lease term, operating lease	1 year
Maximum
Lessee Lease Description [Line Items]
Remaining lease term, operating lease	10 years

X

- Definition

Commitment relating to operating lease, that have not yet commenced.

+ References

No definition available.

+ Details

Name:	roku_CommitmentRelatingToOperatingLeaseThatHaveNotYetCommenced
Namespace Prefix:	roku_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Expected Sublease Income Receivable

+ References

No definition available.

+ Details

Name:	roku_OperatingLeaseExpectedSubleaseReceivable
Namespace Prefix:	roku_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Sublease, Weighted Average Remaining Term

+ References

No definition available.

+ Details

Name:	roku_SubleaseWeightedAverageRemainingTerm
Namespace Prefix:	roku_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147478964/842-20-50-3

+ Details

Name:	us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Remaining lease term of operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147478964/842-20-50-3

+ Details

Name:	us-gaap_LesseeOperatingLeaseRemainingLeaseTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: