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Per Share Data (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 01, 2016	Mar. 27, 2015	Apr. 01, 2016	Mar. 27, 2015
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Document Period End Date			Apr. 01, 2016
Net income attributable to Dolby Laboratories, Inc.	$ 67,398	$ 57,974	$ 98,299	$ 99,331
Weighted average shares outstanding-basic	100,456	102,509	100,600	102,406
Potential common shares from options to purchase common stock	748	889	674	941
Potential common shares from restricted stock units	351	506	442	750
Weighted average shares outstanding-diluted	101,555	103,904	101,716	104,097
Net income per share attributable to Dolby Laboratories, Inc. - Basic (in usd per share)	$ 0.67	$ 0.57	$ 0.98	$ 0.97
Net income per share attributable to Dolby Laboratories, Inc. - Diluted (in usd per share)	$ 0.66	$ 0.56	$ 0.97	$ 0.95
Stock Options [Member]
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Anti-dilutive securities, excluded from calculations (in shares)	7,124	4,604	6,349	3,684
Restricted Stock Units [Member]
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Anti-dilutive securities, excluded from calculations (in shares)	733	934	184	106

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