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Composition Of Certain Financial Statement Captions (Schedule Of Accounts Receivable) (Details) - USD ($) $ in Thousands	Sep. 26, 2025	Sep. 27, 2024
Composition Of Certain Financial Statement Captions [Abstract]
Trade accounts receivable	$ 186,221	$ 170,574
Accounts receivable from patent administration program partners	152,096	150,252
Contract with Customer, Asset, after Allowance for Credit Loss, Current	180,905	197,584
Accounts receivable and contract assets, gross	519,222	518,410
Accounts Receivable And Contract With Customer, Asset, Allowance For Credit Loss, Current	(7,322)	(5,467)
Total accounts receivable and contract assets, net	$ 511,900	$ 512,943

X

- Definition

Accounts Receivable And Contract With Customer, Asset, After Allowance For Credit Loss, Current

+ References

No definition available.

+ Details

Name:	dlb_AccountsReceivableAndContractWithCustomerAssetAfterAllowanceForCreditLossCurrent
Namespace Prefix:	dlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Accounts Receivable And Contract With Customer, Asset, Allowance For Credit Loss, Current

+ References

No definition available.

+ Details

Name:	dlb_AccountsReceivableAndContractWithCustomerAssetAllowanceForCreditLossCurrent
Namespace Prefix:	dlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Accounts Receivable And Contract With Customer, Asset, Before Allowance For Credit Loss, Current

+ References

No definition available.

+ Details

Name:	dlb_AccountsReceivableAndContractWithCustomerAssetBeforeAllowanceForCreditLossCurrent
Namespace Prefix:	dlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Accounts Receivable Related To Patent Administration Program

+ References

No definition available.

+ Details

Name:	dlb_AccountsReceivableRelatedToPatentAdministrationProgram
Namespace Prefix:	dlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Composition Of Certain Financial Statement Captions [Abstract]

+ References

No definition available.

+ Details

Name:	dlb_CompositionOfCertainFinancialStatementCaptionsAbstract
Namespace Prefix:	dlb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Trade Accounts Receivable

+ References

No definition available.

+ Details

Name:	dlb_TradeAccountsReceivable
Namespace Prefix:	dlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount, before allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-3

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant