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Acquisitions (Narrative) (Details) (USD $)
3 Months Ended 12 Months Ended 0 Months Ended
Mar. 27, 2015
Dec. 26, 2014
Mar. 28, 2014
Sep. 26, 2014
Oct. 31, 2014
Business Acquisition, Contingent Consideration [Line Items]          
Acquisition related costs $ 2,800,000us-gaap_BusinessCombinationAcquisitionRelatedCosts $ 400,000us-gaap_BusinessCombinationAcquisitionRelatedCosts $ 3,500,000us-gaap_BusinessCombinationAcquisitionRelatedCosts $ 5,900,000us-gaap_BusinessCombinationAcquisitionRelatedCosts  
Doremi Labs [Member]          
Business Acquisition, Contingent Consideration [Line Items]          
Payments to acquire business         98,402,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= dlb_DoremiLabsMember
Contingent consideration earnout period         4 years
Contingent consideration liability 740,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= dlb_DoremiLabsMember
      20,000,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= dlb_DoremiLabsMember
Cash paid to sellers 98,402,000dlb_BusinessCombinationConsiderationTransferredCashReceivedPaid
/ us-gaap_BusinessAcquisitionAxis
= dlb_DoremiLabsMember
       
Purchase consideration         99,142,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= dlb_DoremiLabsMember
Cash acquired         8,400,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= dlb_DoremiLabsMember
Change in valuation of intangible assets 4,600,000dlb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedPurchaseAccountingAdjustmentIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= dlb_DoremiLabsMember
       
Receivable reversed 4,200,000dlb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedPurchaseAccountingAdjustmentReceivables
/ us-gaap_BusinessAcquisitionAxis
= dlb_DoremiLabsMember
       
Increase to goodwill $ 500,000dlb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedPurchaseAccountingAdjustmentGoodwil
/ us-gaap_BusinessAcquisitionAxis
= dlb_DoremiLabsMember