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Stockholders' Equity And Stock-Based Compensation (Schedule Of Stock-Based Compensation Expense By Plan) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Mar. 27, 2015 | Mar. 28, 2014 | Mar. 27, 2015 | Mar. 28, 2014
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |
Stock-based compensation expense | $ 16,667 us-gaap_AllocatedShareBasedCompensationExpense | $ 17,753 us-gaap_AllocatedShareBasedCompensationExpense | $ 34,509 us-gaap_AllocatedShareBasedCompensationExpense | $ 32,807 us-gaap_AllocatedShareBasedCompensationExpense
Share-based Compensation |  |  | 34,509 us-gaap_ShareBasedCompensation | 32,807 us-gaap_ShareBasedCompensation
Benefit from income taxes | (4,890)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | (5,290)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | (10,041)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | (9,686)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Total stock-based compensation, net of tax | 11,777 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax | 12,463 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax | 24,468 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax | 23,121 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Stock Option [Member] |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |
Stock-based compensation expense | 5,729 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = us-gaap_StockOptionMember | 5,387 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = us-gaap_StockOptionMember |  |
Share-based Compensation |  |  | 12,012 us-gaap_ShareBasedCompensation / us-gaap_PlanNameAxis = us-gaap_StockOptionMember | 9,257 us-gaap_ShareBasedCompensation / us-gaap_PlanNameAxis = us-gaap_StockOptionMember
Restricted Stock Units [Member] |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |
Stock-based compensation expense | 10,077 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = us-gaap_RestrictedStockUnitsRSUMember | 11,565 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = us-gaap_RestrictedStockUnitsRSUMember |  |
Share-based Compensation |  |  | 20,292 us-gaap_ShareBasedCompensation / us-gaap_PlanNameAxis = us-gaap_RestrictedStockUnitsRSUMember | 21,822 us-gaap_ShareBasedCompensation / us-gaap_PlanNameAxis = us-gaap_RestrictedStockUnitsRSUMember
Employee Stock Purchase Plan [Member] |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |
Stock-based compensation expense | 861 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = dlb_EmployeeStockPurchasePlanMember | 801 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = dlb_EmployeeStockPurchasePlanMember |  |
Share-based Compensation |  |  | 2,205 us-gaap_ShareBasedCompensation / us-gaap_PlanNameAxis = dlb_EmployeeStockPurchasePlanMember | 1,728 us-gaap_ShareBasedCompensation / us-gaap_PlanNameAxis = dlb_EmployeeStockPurchasePlanMember
Cost of Sales [Member] |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |
Stock-based compensation expense | 224 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 217 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 470 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 407 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Cost Of Service [Member] |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |
Stock-based compensation expense | 115 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = dlb_CostOfServiceMember | 113 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = dlb_CostOfServiceMember | 237 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = dlb_CostOfServiceMember | 200 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = dlb_CostOfServiceMember
Research and Development Expense [Member] |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |
Stock-based compensation expense | 4,938 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember | 4,889 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember | 10,212 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember | 9,196 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember
Selling and Marketing Expense [Member] |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |
Stock-based compensation expense | 5,576 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember | 6,332 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember | 11,485 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember | 11,357 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember
General and Administrative Expense [Member] |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |
Stock-based compensation expense | $ 5,814 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember | $ 6,202 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember | $ 12,105 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember | $ 11,647 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References No definition available. + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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