v3.5.0.2
Document And Entity Information - USD ($)
$ in Billions
12 Months Ended
Sep. 30, 2016
Oct. 28, 2016
Apr. 01, 2016
Entity Registrant Name Dolby Laboratories, Inc.    
Entity Central Index Key 0001308547    
Current Fiscal Year End Date --09-30    
Entity Filer Category Large Accelerated Filer    
Document Type 10-K    
Document Period End Date Sep. 30, 2016    
Document Fiscal Year Focus 2016    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 1.7
Class A Common Stock [Member]      
Entity Common Stock, Shares Outstanding   57,079,744  
Class B Common Stock [Member]      
Entity Common Stock, Shares Outstanding   44,403,847