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Revenue Recognition (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Sep. 26, 2025	Jun. 27, 2025	Mar. 28, 2025	Dec. 27, 2024	Sep. 26, 2025
Revenue from Contract with Customer [Abstract]
Expected timing of satisfaction period, or less					1 year
Revenue adjustment	$ (1.0)	$ (4.0)	$ 1.0	$ 17.0
Revenue recognized					$ 31.2

X

- Definition

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction1

+ References

No definition available.

+ Details

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Namespace Prefix:	dlb_
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Balance Type:	na
Period Type:	duration

X

- Definition

Amount of revenue recognized arising from contract liability from change in timeframe for performance obligation to be satisfied.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-10

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

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Period Type:	duration

X

- References

No definition available.

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Balance Type:	na
Period Type:	duration