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Composition Of Certain Financial Statement Captions (Schedule Of Accounts Receivable) (Details) - USD ($) $ in Thousands | Sep. 26, 2025 | Sep. 27, 2024
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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

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- Definition Accounts Receivable And Contract With Customer, Asset, After Allowance For Credit Loss, Current + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Accounts Receivable And Contract With Customer, Asset, Allowance For Credit Loss, Current + References No definition available. + Details
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Namespace Prefix: | dlb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Accounts Receivable And Contract With Customer, Asset, Before Allowance For Credit Loss, Current + References No definition available. + Details
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Namespace Prefix: | dlb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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

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- Definition Composition Of Certain Financial Statement Captions [Abstract] + References No definition available. + Details
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Namespace Prefix: | dlb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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

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- 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