v2.4.0.8
Document And Entity Information (USD $)
In Billions, except Share data, unless otherwise specified
12 Months Ended
Sep. 25, 2015
Mar. 27, 2015
Oct. 30, 2015
Class A Common Stock [Member]
Oct. 30, 2015
Class B Common Stock [Member]
Entity Registrant Name Dolby Laboratories, Inc.      
Entity Central Index Key 0001308547      
Current Fiscal Year End Date --09-25      
Entity Filer Category Large Accelerated Filer      
Document Type 10-K      
Document Period End Date Sep. 25, 2015      
Document Fiscal Year Focus 2015      
Document Fiscal Period Focus FY      
Amendment Flag false      
Entity Common Stock, Shares Outstanding     51,635,498 49,215,750
Entity Well-known Seasoned Issuer Yes      
Entity Voluntary Filers No      
Entity Current Reporting Status Yes      
Entity Public Float   $ 1.1