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v2.4.1.9

Goodwill and intangible Assets Finite-Lived Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Mar. 27, 2015 | Mar. 28, 2014 | Sep. 26, 2014
Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | $ 221,044 us-gaap_FiniteLivedIntangibleAssetsGross |  | $ 168,673 us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Amortization | (114,675)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |  | (104,973)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Total | 106,369 us-gaap_FiniteLivedIntangibleAssetsNet |  | 63,700 us-gaap_FiniteLivedIntangibleAssetsNet
Purchases of intangible assets | (6,416)us-gaap_PaymentsToAcquireIntangibleAssets | (12,400)us-gaap_PaymentsToAcquireIntangibleAssets |
Acquired Patents And Technology [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | 142,215 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = dlb_AcquiredPatentsAndTechnologyMember |  | 99,262 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = dlb_AcquiredPatentsAndTechnologyMember
Accumulated Amortization | (68,063)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = dlb_AcquiredPatentsAndTechnologyMember |  | (61,678)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = dlb_AcquiredPatentsAndTechnologyMember
Total | 74,152 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = dlb_AcquiredPatentsAndTechnologyMember |  | 37,584 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = dlb_AcquiredPatentsAndTechnologyMember
Purchases of intangible assets | (6,400)us-gaap_PaymentsToAcquireIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = dlb_AcquiredPatentsAndTechnologyMember |  |
Weighted average useful life | 18 years |  |
Customer Relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | 56,912 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  | 30,717 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Accumulated Amortization | (25,357)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  | (22,739)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Total | 31,555 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  | 7,978 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Other Intangibles [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Cost | 21,917 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |  | 38,694 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Accumulated Amortization | (21,255)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |  | (20,556)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Total | $ 662 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |  | $ 18,138 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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