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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
	Mar. 27, 2015	Dec. 26, 2014	Mar. 27, 2015	Mar. 28, 2014
Stockholders' Equity And Stock-Based Compensation [Abstract]
Shares repurchased (in shares)	390,000us-gaap_StockRepurchasedDuringPeriodShares	389,500us-gaap_StockRepurchasedDuringPeriodShares	779,500us-gaap_StockRepurchasedDuringPeriodShares
Cost	$ 15,411us-gaap_PaymentsForRepurchaseOfCommonStock	$ 16,953us-gaap_PaymentsForRepurchaseOfCommonStock	$ 32,364us-gaap_PaymentsForRepurchaseOfCommonStock	$ 11,660us-gaap_PaymentsForRepurchaseOfCommonStock
Average Price Paid per Share (in dollars per share)	$ 43.51dlb_AveragePricePaidPerShareForRepurchaseActivity		$ 43.51dlb_AveragePricePaidPerShareForRepurchaseActivity	$ 39.47dlb_AveragePricePaidPerShareForRepurchaseActivity

X

- Definition

Average Price Paid Per Share For Repurchase Activity

+ References

No definition available.

+ Details

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Namespace Prefix:	dlb_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	dlb_StockholdersEquityAndStockBasedCompensationAbstract
Namespace Prefix:	dlb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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

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