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Income Taxes (Withholding Taxes) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Mar. 27, 2015 | Mar. 28, 2014 | Mar. 27, 2015 | Mar. 28, 2014
Income Tax Disclosure [Abstract] |  |  |  |
Withholding taxes | $ 11,942 dlb_LicensingRevenueWithholdingTaxRemittances | $ 12,673 dlb_LicensingRevenueWithholdingTaxRemittances | $ 24,142 dlb_LicensingRevenueWithholdingTaxRemittances | $ 23,098 dlb_LicensingRevenueWithholdingTaxRemittances

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- Definition Licensing Revenue Withholding Tax Remittances + References No definition available. + Details
Name: | dlb_LicensingRevenueWithholdingTaxRemittances
Namespace Prefix: | dlb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration