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Goodwill and intangible Assets Goodwill Rollforward (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Mar. 27, 2015 | Oct. 31, 2014
Goodwill [Roll Forward] |  |
Balance at September 26, 2014 | $ 277,574 us-gaap_Goodwill |
Acquired goodwill (preliminary) | 40,372 us-gaap_GoodwillAcquiredDuringPeriod |
Translation adjustments | (5,077)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments |
Balance at March 27, 2015 | 312,869 us-gaap_Goodwill |
Doremi Labs [Member] |  |
Goodwill [Roll Forward] |  |
Balance at September 26, 2014 |  | 39,672 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dlb_DoremiLabsMember
Acquired goodwill (preliminary) | 39,700 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = dlb_DoremiLabsMember |
Balance at March 27, 2015 |  | 39,672 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dlb_DoremiLabsMember
Other Acquisitions [Member] |  |
Goodwill [Roll Forward] |  |
Acquired goodwill (preliminary) | $ 700 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = dlb_OtherAcquisitionsMember |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Definition Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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