Document And Entity Information - shares	3 Months Ended
	Dec. 29, 2017	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	Dec. 29, 2017
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Amendment Flag	false
Class A Common Stock [Member]
Entity Common Stock, Shares Outstanding		60,791,241
Class B Common Stock [Member]
Entity Common Stock, Shares Outstanding		42,733,597