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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
	Mar. 27, 2015	Mar. 28, 2014	Mar. 27, 2015	Mar. 28, 2014
Stockholders' Equity And Stock-Based Compensation [Line Items]
Stock-based compensation expense	$ 16,667us-gaap_AllocatedShareBasedCompensationExpense	$ 17,753us-gaap_AllocatedShareBasedCompensationExpense	$ 34,509us-gaap_AllocatedShareBasedCompensationExpense	$ 32,807us-gaap_AllocatedShareBasedCompensationExpense
Share-based Compensation			34,509us-gaap_ShareBasedCompensation	32,807us-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	11,777us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax	12,463us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax	24,468us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax	23,121us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Stock Option [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Stock-based compensation expense	5,729us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = us-gaap_StockOptionMember	5,387us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = us-gaap_StockOptionMember
Share-based Compensation			12,012us-gaap_ShareBasedCompensation / us-gaap_PlanNameAxis = us-gaap_StockOptionMember	9,257us-gaap_ShareBasedCompensation / us-gaap_PlanNameAxis = us-gaap_StockOptionMember
Restricted Stock Units [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Stock-based compensation expense	10,077us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = us-gaap_RestrictedStockUnitsRSUMember	11,565us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = us-gaap_RestrictedStockUnitsRSUMember
Share-based Compensation			20,292us-gaap_ShareBasedCompensation / us-gaap_PlanNameAxis = us-gaap_RestrictedStockUnitsRSUMember	21,822us-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	861us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = dlb_EmployeeStockPurchasePlanMember	801us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = dlb_EmployeeStockPurchasePlanMember
Share-based Compensation			2,205us-gaap_ShareBasedCompensation / us-gaap_PlanNameAxis = dlb_EmployeeStockPurchasePlanMember	1,728us-gaap_ShareBasedCompensation / us-gaap_PlanNameAxis = dlb_EmployeeStockPurchasePlanMember
Cost of Sales [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Stock-based compensation expense	224us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember	217us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember	470us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember	407us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Cost Of Service [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Stock-based compensation expense	115us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = dlb_CostOfServiceMember	113us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = dlb_CostOfServiceMember	237us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = dlb_CostOfServiceMember	200us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = dlb_CostOfServiceMember
Research and Development Expense [Member]
Stockholders' Equity And Stock-Based Compensation [Line Items]
Stock-based compensation expense	4,938us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember	4,889us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember	10,212us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember	9,196us-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	5,576us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember	6,332us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember	11,485us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember	11,357us-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	$ 5,814us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember	$ 6,202us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember	$ 12,105us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember	$ 11,647us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember

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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.

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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.

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