XML 70 R60.htm IDEA: XBRL DOCUMENT
v3.23.1

Stockholders' Equity And Stock-Based Compensation (Narrative) (Details) |  |  |  |  | 1 Months Ended | 6 Months Ended | 41 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 15, 2022 shares | Dec. 15, 2021 shares | Dec. 15, 2020 shares | Dec. 16, 2019 shares | Dec. 30, 2022 | Mar. 31, 2023 USD ($) vote shares | Mar. 28, 2014 | Sep. 30, 2022 shares
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Shares, Granted (in shares) |  |  |  |  |  | 1,591,000 |  |
Vested in period (in shares) |  |  |  |  |  | 1,103,000 |  |
Options outstanding to purchase |  |  |  |  |  |  |  | 4,059,000
Remaining authorization to purchase additional shares | $ |  |  |  |  |  | $ 261,600,000 |  |
Stock options |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Stock options expected to vest | $ |  |  |  |  |  | $ 14,900,000 |  |
Employee stock options expected to be recognized over a weighted-average period |  |  |  |  |  | 2 years 7 months 6 days |  |
Performance-Based Stock Options [Member] |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  | 7 years |  |
Compensation requisite measurement period |  |  |  |  |  | 3 years |  |
Shares exercisable (in shares) |  |  |  |  |  | 315,839 |  |
Restricted stock units |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  | 4 years |  |
Stock options expected to vest | $ |  |  |  |  |  | $ 231,500,000 |  |
Employee stock options expected to be recognized over a weighted-average period |  |  |  |  |  | 2 years 9 months 18 days |  |
Restricted stock units | Employees and Officers [Member] |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  | 4 years |  |
Restricted stock units | Awards Granted Prior to November 2010 [Member] | Directors [Member] |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  | 1 year |
Performance-Based Restricted Stock Units [Member] |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Compensation requisite measurement period |  |  |  |  |  | 3 years |  |
Performance-Based Restricted Stock Units [Member] | Executive Officer [Member] |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Percentage Vested of Target Award |  | 200.00% | 200.00% |  |  | 200.00% |  |
Shares exercisable (in shares) |  | 120,602 | 132,276 |  |  |  |  |
Options outstanding to purchase |  | 60,301 | 66,138 |  |  | 204,709 |  |
Performance-Based Restricted Stock Units [Member] | Vesting Shares At 200% Of The Target Award Amount | Executive Officer [Member] |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Options outstanding to purchase |  |  |  |  |  | 409,418 |  |
Performance Shares | Executive Officer [Member] |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Shares, Granted (in shares) | 90,613 |  |  | 62,000 |  |  |  |
Award vesting rights, percentage | 200.00% |  |  |  | 81.00% |  |  |
Vested in period (in shares) | 181,226 |  |  |  |  |  |  |
Awards Granted Under 2005 Stock Plan Prior To February 2011 [Member] |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Terms for issuance of stock (in shares) |  |  |  |  |  | 2 |  |
Awards Granted Under 2005 Stock Plan From February 2011 [Member] |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Terms for issuance of stock (in shares) |  |  |  |  |  | 1.6 |  |
Employee stock purchase plan |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Percentage of compensation withheld by employees to purchase common stock |  |  |  |  |  | 10.00% |  |
Discount from market price on purchase date |  |  |  |  |  | 15.00% |  |
Class A Common Stock [Member] |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Common stock, shares authorized (shares) |  |  |  |  |  | 500,000,000 |  | 500,000,000
Common stock, shares issued (shares) |  |  |  |  |  | 59,671,342 |  | 59,798,862
Common stock, shares outstanding (shares) |  |  |  |  |  | 59,671,342 |  | 59,798,862
Common stock, number of votes per share | vote |  |  |  |  |  | 1 |  |
Class A Common Stock [Member] | 2005 Stock Plan. [Member] |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Shares authorized under plan |  |  |  |  |  | 64,000,000 |  |
Options outstanding to purchase |  |  |  |  |  | 4,060,000 |  |
Class A Common Stock [Member] | Employee stock purchase plan |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Maximum value of common stock available for eligible employees | $ |  |  |  |  |  | $ 25,000 |  |
Maximum number of common stock available for eligible employees (in shares) |  |  |  |  |  | 1,000 |  |
Purchase period |  |  |  |  |  | 6 months |  |
Look back commencement period |  |  |  |  |  | 1 year |  |
Class B Common Stock [Member] |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Common stock, shares authorized (shares) |  |  |  |  |  | 500,000,000 |  | 500,000,000
Common stock, shares issued (shares) |  |  |  |  |  | 36,085,779 |  | 36,085,779
Common stock, shares outstanding (shares) |  |  |  |  |  | 36,085,779 |  | 36,085,779
Common stock, number of votes per share | vote |  |  |  |  |  | 10 |  |
Options Granted From June Two Thousand Eight Member | Stock options |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  | 4 years |  |
Options Granted From June Two Thousand Eight Member | Stock options | One year anniversary date |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  | 1 year |  |
Percentage of stock option becoming exercisable subjected to date of grant |  |  |  |  |  | 25.00% |  |
Options Granted From June Two Thousand Eight Member | Stock options | Over 36 equally installment periods following one year anniversary date |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  | 36 months |  |
Awards Granted After November 2010 Member [Member] | Restricted stock units |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  | 1 year |  |
Minimum [Member] | Performance-Based Stock Options [Member] |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Percentage Vested of Target Award |  |  |  |  |  | 0.00% |  |
Minimum [Member] | Performance-Based Restricted Stock Units [Member] |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Percentage Vested of Target Award |  |  |  |  |  | 0.00% |  |
Minimum [Member] | Options Granted From June Two Thousand Eight Member | Stock options |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Options expiration period |  |  |  |  |  | 3 months |  |
Maximum [Member] | Performance-Based Stock Options [Member] |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Percentage Vested of Target Award |  |  |  |  |  | 125.00% |  |
Maximum [Member] | Performance-Based Restricted Stock Units [Member] |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Percentage Vested of Target Award |  |  |  |  |  | 200.00% |  |
Maximum [Member] | Options Granted From June Two Thousand Eight Member | Stock options |  |  |  |  |  |  |  |
Stockholders' Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |  |
Options expiration period |  |  |  |  |  | 10 years |  |

X
- Definition Common Stock, Number of Votes + References No definition available. + Details
Name: | dlb_CommonStockNumberofVotes
Namespace Prefix: | dlb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of compensation withheld by employees to purchase common stock. + References No definition available. + Details
Name: | dlb_PercentageOfCompensationWithheldByEmployeesToPurchaseCommonStock
Namespace Prefix: | dlb_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage Of Target Award + References No definition available. + Details
Name: | dlb_PercentageOfTargetAward
Namespace Prefix: | dlb_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share based compensation arrangement by share based payment award maximum value of shares per employee. + References No definition available. + Details
Name: | dlb_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumValueOfSharesPerEmployee
Namespace Prefix: | dlb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Share based compensation arrangement by share based payment award options becoming exercisable. + References No definition available. + Details
Name: | dlb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsBecomingExercisable
Namespace Prefix: | dlb_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share-based Compensation Arrangement by Share-based Payment Award, Look Back Commencement Period + References No definition available. + Details
Name: | dlb_SharebasedCompensationArrangementbySharebasedPaymentAwardLookBackCommencementPeriod
Namespace Prefix: | dlb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share-based Compensation Arrangement by Share-based Payment Award, Purchase Period + References No definition available. + Details
Name: | dlb_SharebasedCompensationArrangementbySharebasedPaymentAwardPurchasePeriod
Namespace Prefix: | dlb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Stockholders' Equity And Stock-Based Compensation [Line Items] + References No definition available. + Details
Name: | dlb_StockholdersEquityAndStockBasedCompensationLineItems
Namespace Prefix: | dlb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Terms for issuance of stock. + References No definition available. + Details
Name: | dlb_TermsForIssuanceOfStock
Namespace Prefix: | dlb_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_CommonStockSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_CommonStockSharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_CommonStockSharesOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualRequisiteServicePeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Discount rate from fair value on purchase date that participants pay for shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPricePurchaseDate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The highest quantity of shares an employee can purchase under the plan per period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(iii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of vesting of award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=dlb_PerformanceBasedStockOptionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_TitleOfIndividualAxis=dlb_EmployeeandOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=dlb_AwardsGrantedPriortoNovember2010Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_TitleOfIndividualAxis=srt_DirectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=dlb_PerformanceBasedRestrictedStockUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_TitleOfIndividualAxis=srt_ExecutiveOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=dlb_VestingSharesAt200OfTheTargetAwardAmountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=dlb_AwardsGrantedUnderTwoThousandFiveStockPlanPriorToFebruaryTwoThousandElevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=dlb_AwardsGrantedUnderTwoThousandFiveStockPlanFromFebruaryTwoThousandElevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=dlb_EmployeeStockPurchasePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=dlb_TwoThousandFiveStockPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=dlb_OptionsGrantedFromJuneTwoThousandEightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=dlb_AwardsGrantedAfterNovember2010MemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |