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Composition Of Certain Financial Statement Captions (Schedule Of Other Non-Current Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 27, 2015	Sep. 26, 2014
Composition Of Certain Financial Statement Captions [Abstract]
Supplemental retirement plan obligations	$ 2,400us-gaap_OtherPostretirementBenefitsPayableNoncurrent	$ 2,409us-gaap_OtherPostretirementBenefitsPayableNoncurrent
Non-current tax liabilities	49,180dlb_NonCurrentTaxLiabilities	30,715dlb_NonCurrentTaxLiabilities
Other liabilities	13,135us-gaap_OtherLiabilities	10,591us-gaap_OtherLiabilities
Other non-current liabilities	$ 64,715us-gaap_OtherLiabilitiesNoncurrent	$ 43,715us-gaap_OtherLiabilitiesNoncurrent

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- Details

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- Definition

Non-Current Tax Liabilities

+ References

No definition available.

+ Details

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X

- Definition

The aggregate carrying amount, as of the balance sheet date, of liabilities not separately disclosed in the balance sheet.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Article 9



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.15)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.24)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 24

-Article 5

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- Definition

The total amount of the entity's noncurrent obligation as of the balance sheet date under any other retirement plan(s), such as one or more defined contribution plans.

+ References

No definition available.

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