XML 16 R55.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Stockholders' Equity And Stock-Based Compensation (Stock Repurchase Authorizations) (Details) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 60 Months Ended | 1 Months Ended
--- | --- | --- | ---
Nov. 30, 2009 | Oct. 31, 2014 | Oct. 31, 2014 | Feb. 29, 2012 | Jul. 31, 2011 | Jul. 31, 2010
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Authorization Amount | $ 250,000 us-gaap_StockRepurchaseProgramAuthorizedAmount | $ 1,100,000 us-gaap_StockRepurchaseProgramAuthorizedAmount |  |  |  |
Additional Stock Approved [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Authorization Amount |  |  | $ 200,000 us-gaap_StockRepurchaseProgramAuthorizedAmount / us-gaap_PlanNameAxis = dlb_AdditionalStockApprovedMember | $ 100,000 us-gaap_StockRepurchaseProgramAuthorizedAmount / us-gaap_PlanNameAxis = dlb_AdditionalStockApprovedMember | $ 250,000 us-gaap_StockRepurchaseProgramAuthorizedAmount / us-gaap_PlanNameAxis = dlb_AdditionalStockApprovedMember | $ 300,000 us-gaap_StockRepurchaseProgramAuthorizedAmount / us-gaap_PlanNameAxis = dlb_AdditionalStockApprovedMember

X
- Details
Name: | us-gaap_EquityClassOfTreasuryStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of a stock repurchase plan authorized by an entity's Board of Directors. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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