v3.7.0.1
Document And Entity Information - shares
9 Months Ended
Jun. 30, 2017
Jul. 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 Jun. 30, 2017  
Document Fiscal Year Focus 2017  
Document Fiscal Period Focus Q3  
Amendment Flag false  
Class A Common Stock [Member]    
Entity Common Stock, Shares Outstanding   58,014,060
Class B Common Stock [Member]    
Entity Common Stock, Shares Outstanding   44,023,597