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Stockholders' Equity And Stock-Based Compensation (Stock Repurchase) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Mar. 27, 2015 | Dec. 26, 2014 | Mar. 27, 2015 | Mar. 28, 2014
Stockholders' Equity And Stock-Based Compensation [Abstract] |  |  |  |
Shares repurchased (in shares) | 390,000 us-gaap_StockRepurchasedDuringPeriodShares | 389,500 us-gaap_StockRepurchasedDuringPeriodShares | 779,500 us-gaap_StockRepurchasedDuringPeriodShares |
Cost | $ 15,411 us-gaap_PaymentsForRepurchaseOfCommonStock | $ 16,953 us-gaap_PaymentsForRepurchaseOfCommonStock | $ 32,364 us-gaap_PaymentsForRepurchaseOfCommonStock | $ 11,660 us-gaap_PaymentsForRepurchaseOfCommonStock
Average Price Paid per Share (in dollars per share) | $ 43.51 dlb_AveragePricePaidPerShareForRepurchaseActivity |  | $ 43.51 dlb_AveragePricePaidPerShareForRepurchaseActivity | $ 39.47 dlb_AveragePricePaidPerShareForRepurchaseActivity

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- Definition Average Price Paid Per Share For Repurchase Activity + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | dlb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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Period Type: | duration