v3.10.0.1
Document And Entity Information - shares
3 Months Ended
Dec. 28, 2018
Jan. 25, 2019
Entity Registrant Name Dolby Laboratories, Inc.  
Entity Central Index Key 0001308547  
Current Fiscal Year End Date --09-27  
Entity Filer Category Large Accelerated Filer  
Document Type 10-Q  
Document Period End Date Dec. 28, 2018  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Class A Common Stock [Member]    
Entity Common Stock, Shares Outstanding   64,386,897
Class B Common Stock [Member]    
Entity Common Stock, Shares Outstanding   38,229,820