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Composition Of Certain Financial Statement Captions (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |
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Mar. 27, 2015 | Mar. 28, 2014 | Sep. 26, 2014
Composition Of Certain Financial Statement Captions [Line Items] |  |  |
Capital expenditures incurred, not yet paid | $ 27,824 us-gaap_CapitalExpendituresIncurredButNotYetPaid | $ 2,662 us-gaap_CapitalExpendituresIncurredButNotYetPaid |
Raw materials | 9,752 us-gaap_InventoryRawMaterials |  | 1,013 us-gaap_InventoryRawMaterials
Capital expenditures incurred, but not yet paid |  |  | 8,700 dlb_AccrualforUnpaidPropertyPlantandEquipmentAdditions
Other Noncurrent Assets [Member] |  |  |
Composition Of Certain Financial Statement Captions [Line Items] |  |  |
Raw materials | $ 1,800 us-gaap_InventoryRawMaterials / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentAssetsMember |  | $ 1,700 us-gaap_InventoryRawMaterials / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentAssetsMember

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- Definition Accrual for Unpaid, Property, Plant and Equipment Additions + References No definition available. + Details
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- Definition Future cash outflow to pay for purchases of fixed assets that have occurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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