Per Share Data (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 26, 2015	Jun. 27, 2014	Jun. 26, 2015	Jun. 27, 2014
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Document Period End Date			Jun. 26, 2015
Net income attributable to Dolby Laboratories, Inc.	$ 35,506	$ 39,779	$ 134,837	$ 160,162
Weighted average shares outstanding-basic	102,670	102,350	102,494	102,131
Potential common shares from options to purchase common stock	827	616	903	500
Potential common shares from restricted stock units	608	976	730	974
Weighted average shares outstanding-diluted	104,105	103,942	104,127	103,605
Net income per share attributable to Dolby Laboratories, Inc. - Basic (in usd per share)	$ 0.35	$ 0.39	$ 1.32	$ 1.57
Net income per share attributable to Dolby Laboratories, Inc. - Diluted (in usd per share)	$ 0.34	$ 0.38	$ 1.29	$ 1.55
Stock Options [Member]
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Anti-dilutive securities, excluded from calculations (in shares)	4,617	3,563	3,962	3,915
Restricted Stock Units [Member]
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Anti-dilutive securities, excluded from calculations (in shares)	10	184	6	1,756