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Composition Of Certain Financial Statement Captions (Schedule Of Accounts Receivable) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 27, 2015 | Sep. 26, 2014
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Composition Of Certain Financial Statement Captions [Abstract] |  |
Trade accounts receivable | $ 91,792 dlb_TradeAccountsReceivable | $ 78,189 dlb_TradeAccountsReceivable
Accounts receivable related to patent administration program | 7,816 dlb_AccountsReceivableRelatedToPatentAdministrationProgram | 9,594 dlb_AccountsReceivableRelatedToPatentAdministrationProgram
Accounts receivable, gross | 99,608 us-gaap_AccountsReceivableGrossCurrent | 87,783 us-gaap_AccountsReceivableGrossCurrent
Less: allowance for doubtful accounts | (1,046)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | (1,615)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accounts receivable, net | $ 98,562 us-gaap_AccountsReceivableNetCurrent | $ 86,168 us-gaap_AccountsReceivableNetCurrent

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- Definition Accounts Receivable Related To Patent Administration Program + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Details
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- Definition Trade Accounts Receivable + References No definition available. + Details
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Namespace Prefix: | dlb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business. + 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 210.5-02.3) -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 03 -Paragraph 3 -Subparagraph a, b -Article 5 + Details
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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + 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 210.5-02.3-4) -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 3 -Subparagraph a(1) -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 + Details
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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | credit
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