v2.4.0.8
Document And Entity Information (USD $)
In Billions, except Share data, unless otherwise specified
12 Months Ended
Sep. 26, 2014
Mar. 28, 2014
Oct. 24, 2014
Class A Common Stock [Member]
Oct. 24, 2014
Class B Common Stock [Member]
Entity Registrant Name Dolby Laboratories, Inc.      
Entity Central Index Key 0001308547      
Current Fiscal Year End Date --09-26      
Entity Filer Category Large Accelerated Filer      
Document Type 10-K      
Document Period End Date Sep. 26, 2014      
Document Fiscal Year Focus 2014      
Document Fiscal Period Focus FY      
Amendment Flag false      
Entity Common Stock, Shares Outstanding     50,796,461 51,490,239
Entity Well-known Seasoned Issuer Yes      
Entity Voluntary Filers No      
Entity Current Reporting Status Yes      
Entity Public Float   $ 1.3