v3.10.0.1
Document And Entity Information - shares
9 Months Ended
Jun. 29, 2018
Jul. 27, 2018
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-Q  
Document Period End Date Jun. 29, 2018  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q3  
Amendment Flag false  
Class A Common Stock [Member]    
Entity Common Stock, Shares Outstanding   64,363,621
Class B Common Stock [Member]    
Entity Common Stock, Shares Outstanding   39,283,678