Document And Entity Information - shares	9 Months Ended
	Jun. 26, 2015	Jul. 24, 2015
Entity Registrant Name	Dolby Laboratories, Inc.
Entity Central Index Key	0001308547
Current Fiscal Year End Date	--09-25
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 26, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3
Amendment Flag	false
Class A Common Stock [Member]
Entity Common Stock, Shares Outstanding		51,928,535
Class B Common Stock [Member]
Entity Common Stock, Shares Outstanding		50,743,411