v2.4.0.6
Document And Entity Information (USD $)
In Billions, except Share data, unless otherwise specified
12 Months Ended
Sep. 28, 2012
Mar. 30, 2012
Nov. 02, 2012
Class A Common Stock [Member]
Nov. 02, 2012
Class B Common Stock [Member]
Entity Registrant Name Dolby Laboratories, Inc.      
Entity Central Index Key 0001308547      
Current Fiscal Year End Date --09-28      
Entity Filer Category Large Accelerated Filer      
Document Type 10-K      
Document Period End Date Sep. 28, 2012      
Document Fiscal Year Focus 2012      
Document Fiscal Period Focus FY      
Amendment Flag false      
Entity Common Stock, Shares Outstanding     45,837,295 56,598,329
Entity Well-known Seasoned Issuer Yes      
Entity Voluntary Filers No      
Entity Current Reporting Status Yes      
Entity Public Float   $ 1.7