v3.8.0.1
Document And Entity Information - shares
6 Months Ended
Mar. 30, 2018
Jan. 26, 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 Mar. 30, 2018  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Class A Common Stock [Member]    
Entity Common Stock, Shares Outstanding   62,434,488
Class B Common Stock [Member]    
Entity Common Stock, Shares Outstanding   41,677,918