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