Per Share Data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Dec. 27, 2013	Dec. 28, 2012
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net income attributable to Dolby Laboratories, Inc.	$ 44,515	$ 51,349
Weighted average shares outstanding-basic	101,750	102,361
Potential common shares from options to purchase Class A and Class B common stock	328	326
Potential common shares from restricted stock units	1,114	836
Weighted average shares outstanding-diluted	103,192	103,523
Net income per share attributable to Dolby Laboratories, Inc. - Basic	$ 0.44	$ 0.50
Net income per share attributable to Dolby Laboratories, Inc. - Diluted	$ 0.43	$ 0.50
Stock Options [Member]
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Anti-dilutive securities, excluded from calculations	6,791	5,178
Restricted Stock Units [Member]
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Anti-dilutive securities, excluded from calculations	1,038	1,327