v3.7.0.1
Document And Entity Information - shares
6 Months Ended
Mar. 31, 2017
Apr. 28, 2017
Entity Registrant Name Dolby Laboratories, Inc.  
Entity Central Index Key 0001308547  
Current Fiscal Year End Date --09-29  
Entity Filer Category Large Accelerated Filer  
Document Type 10-Q  
Document Period End Date Mar. 31, 2017  
Document Fiscal Year Focus 2017  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Class A Common Stock [Member]    
Entity Common Stock, Shares Outstanding   57,958,551
Class B Common Stock [Member]    
Entity Common Stock, Shares Outstanding   44,073,597