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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 | $ 2,800,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts | $ 400,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts | $ 3,500,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts | $ 5,900,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts |
Doremi Labs [Member] |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |
Payments to acquire business |  |  |  |  | 98,402,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = dlb_DoremiLabsMember
Contingent consideration earnout period |  |  |  |  | 4 years
Contingent consideration liability | 740,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = dlb_DoremiLabsMember |  |  |  | 20,000,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = dlb_DoremiLabsMember
Cash paid to sellers | 98,402,000 dlb_BusinessCombinationConsiderationTransferredCashReceivedPaid / us-gaap_BusinessAcquisitionAxis = dlb_DoremiLabsMember |  |  |  |
Purchase consideration |  |  |  |  | 99,142,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = dlb_DoremiLabsMember
Cash acquired |  |  |  |  | 8,400,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = dlb_DoremiLabsMember
Change in valuation of intangible assets | 4,600,000 dlb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedPurchaseAccountingAdjustmentIntangibleAssets / us-gaap_BusinessAcquisitionAxis = dlb_DoremiLabsMember |  |  |  |
Receivable reversed | 4,200,000 dlb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedPurchaseAccountingAdjustmentReceivables / us-gaap_BusinessAcquisitionAxis = dlb_DoremiLabsMember |  |  |  |
Increase to goodwill | $ 500,000 dlb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedPurchaseAccountingAdjustmentGoodwil / us-gaap_BusinessAcquisitionAxis = dlb_DoremiLabsMember |  |  |  |

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- Definition Business Combination, Consideration Transferred, Cash Received (Paid) + References No definition available. + Details
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- Definition Business Combination, Contingent Consideration Arrangements, Earnout Period + References No definition available. + Details
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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Purchase Accounting Adjustment, Goodwil + References No definition available. + Details
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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Purchase Accounting Adjustment, Intangible Assets + References No definition available. + Details
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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Purchase Accounting Adjustment, Receivables + References No definition available. + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e1043-128460 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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