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Stockholders' Equity And Stock-Based Compensation (Narrative) (Details) (USD $) | 0 Months Ended | 3 Months Ended | 6 Months Ended | 37 Months Ended | 41 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 19, 2015 | Oct. 21, 2014 | Mar. 27, 2015 | Mar. 28, 2014 | Mar. 27, 2015 | Mar. 28, 2014 | Oct. 31, 2010 | Mar. 28, 2014 | Sep. 26, 2014
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |
Options outstanding to purchase |  |  | 9,233,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  | 9,233,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  |  |  | 7,611,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Weighted average remaining contractual life |  |  |  |  | 7 years 7 months 6 days |  |  |  |
Year end stock price |  |  |  |  | $ 38.10 dlb_YearEndStockPrice |  |  |  |
Percentage of vesting per year |  |  |  |  |  |  | 50.00%dlb_PercentageOfVestingPerYear |  |
Common stock, dividends declared (in dollars per share) | $ 0.1 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.1 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.10 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.00 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.20 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.00 us-gaap_CommonStockDividendsPerShareDeclared |  |  |
Remaining authorization to purchase additional shares |  |  |  |  | $ 227,700,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |
Stock options expected to vest |  |  | 89,600,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  | 89,600,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |
Employee stock options expected to be recognized over a weighted-average period |  |  |  |  | 2 years 10 months 24 days |  |  |  |
Employees and Officers [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |
Options vesting period |  |  |  |  | 4 years |  |  |  |
Awards Granted Prior to November 2010 [Member] | Directors [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |
Options vesting period |  |  |  |  |  |  | 3 years | 1 year |
Awards Granted After November 2010 [Member] | Directors [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |
Options vesting period |  |  |  |  |  |  | 2 years |  |
Awards Granted Under 2005 Stock Plan Prior To February 2011 [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |
Terms for issuance of stock |  |  |  |  | 2 dlb_TermsForIssuanceOfStock / us-gaap_PlanNameAxis = dlb_AwardsGrantedUnderTwoThousandFiveStockPlanPriorToFebruaryTwoThousandElevenMember |  |  |  |
Awards Granted Under 2005 Stock Plan From February 2011 [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |
Terms for issuance of stock |  |  |  |  | 1.6 dlb_TermsForIssuanceOfStock / us-gaap_PlanNameAxis = dlb_AwardsGrantedUnderTwoThousandFiveStockPlanFromFebruaryTwoThousandElevenMember |  |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |
Percentage of compensation withheld by employees to purchase common stock |  |  |  |  | 10.00%dlb_PercentageOfCompensationWithheldByEmployeesToPurchaseCommonStock / us-gaap_PlanNameAxis = dlb_EmployeeStockPurchasePlanMember |  |  |  |
Common stock purchase price determined over percentage of closing price |  |  |  |  | 15.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPricePurchaseDate / us-gaap_PlanNameAxis = dlb_EmployeeStockPurchasePlanMember |  |  |  |
Employee Stock Option [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |
Stock options expected to vest |  |  | 34,000,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember |  | 34,000,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Employee stock options expected to be recognized over a weighted-average period |  |  |  |  | 2 years 2 months 12 days |  |  |  |
Class A Common Stock [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized (shares) |  |  | 500,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | 500,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |  |  | 500,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Common stock, shares issued (shares) |  |  | 51,383,446 us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | 51,383,446 us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |  |  | 50,658,627 us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Common stock, shares outstanding (shares) |  |  | 51,383,446 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | 51,383,446 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |  |  | 50,658,627 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Class A Common Stock [Member] | 2005 Stock Plan. [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |
Shares authorized under plan |  |  | 38,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = dlb_TwoThousandFiveStockPlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | 38,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = dlb_TwoThousandFiveStockPlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |  |  |
Options outstanding to purchase |  |  | 9,200,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = dlb_TwoThousandFiveStockPlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | 9,200,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = dlb_TwoThousandFiveStockPlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |  |  |
Weighted average remaining contractual life |  |  |  |  | 7 years 6 months |  |  |  |
Options vested and exercisable |  |  | 4,200,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber / us-gaap_PlanNameAxis = dlb_TwoThousandFiveStockPlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | 4,200,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber / us-gaap_PlanNameAxis = dlb_TwoThousandFiveStockPlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |  |  |
Class A Common Stock [Member] | Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |
Maximum value of common stock available for eligible employees |  |  |  |  | $ 25,000 dlb_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumValueOfSharesPerEmployee / us-gaap_PlanNameAxis = dlb_EmployeeStockPurchasePlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |  |  |
Purchase period |  |  |  |  | 6 months |  |  |  |
Look back commencement period |  |  |  |  | 1 year |  |  |  |
Overlapping offering period |  |  |  |  | 1 year |  |  |  |
Class A Common Stock [Member] | Employee Stock Purchase Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |
Maximum number of common stock available for eligible employees |  |  |  |  | 1,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee / us-gaap_PlanNameAxis = dlb_EmployeeStockPurchasePlanMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |  |  |
Class B Common Stock [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized (shares) |  |  | 500,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  | 500,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |  |  | 500,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Common stock, shares issued (shares) |  |  | 51,073,661 us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  | 51,073,661 us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |  |  | 51,610,239 us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Common stock, shares outstanding (shares) |  |  | 51,073,661 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  | 51,073,661 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |  |  | 51,610,239 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Class B Common Stock [Member] | 2000 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |
Shares authorized under plan |  |  | 15,100,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = dlb_TwoThousandStockIncentivePlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  | 15,100,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = dlb_TwoThousandStockIncentivePlanMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |  |  |
Options vesting period |  |  |  |  | 4 years |  |  |  |
Options expiration period |  |  |  |  | 10 years |  |  |  |
Options Granted Prior To June 2008 [Member] | Employee Stock Option [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |
Options expiration period |  |  |  |  | 10 years |  |  |  |
Options Granted From June 2008 [Member] | Employee Stock Option [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |  |
Options vesting period |  |  |  |  | 4 years |  |  |  |
Percentage of stock option becoming exercisable subjected to date of grant |  |  |  |  | 25.00%dlb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsBecomingExercisable / us-gaap_PlanNameAxis = us-gaap_EmployeeStockOptionMember / us-gaap_StatementClassOfStockAxis = dlb_OptionsGrantedFromJuneTwoThousandEightMember |  |  |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Discount rate from fair value on purchase date that participants pay for shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The highest quantity of shares an employee can purchase under the plan per 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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