XML 45 R34.htm IDEA: XBRL DOCUMENT
v3.4.0.3

Basis Of Presentation (Details) - segment | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 01, 2016 | Mar. 27, 2015 | Apr. 01, 2016 | Sep. 30, 2016 | Sep. 25, 2015
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of weeks in fiscal year | 14 years | 13 years |  |  | 52 years
Number of Operating Segments |  |  | 1 |  |
Scenario, Forecast [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Number of weeks in fiscal year |  |  |  | 53 years |

X
- Definition Duration of Fiscal Period + References No definition available. + Details
Name: | dlb_DurationofFiscalPeriod
Namespace Prefix: | dlb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Significant Accounting Policies [Line Items] + References No definition available. + Details
Name: | dlb_SignificantAccountingPoliciesLineItems
Namespace Prefix: | dlb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
Name: | us-gaap_NumberOfOperatingSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |