Per Share Data (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 01, 2022	Jun. 25, 2021	Jul. 01, 2022	Jun. 25, 2021
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net income attributable to Dolby Laboratories, Inc.	$ 39,597	$ 54,621	$ 156,331	$ 266,036
Weighted average shares outstanding-basic (in shares)	100,213	101,351	100,936	101,177
Potential common shares from options to purchase common stock (in shares)	779	2,062	1,037	2,033
Potential common shares from restricted stock units (in shares)	409	1,169	916	1,319
Potential common shares from ESPP (in shares)	73	51	104	78
Weighted average shares outstanding-diluted (in shares)	101,474	104,633	102,993	104,607
Net income per share attributable to Dolby Laboratories, Inc. - Basic (in usd per share)	$ 0.40	$ 0.54	$ 1.55	$ 2.63
Net income per share attributable to Dolby Laboratories, Inc. - Diluted (in usd per share)	$ 0.39	$ 0.52	$ 1.52	$ 2.54
Stock options
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Anti-dilutive securities, excluded from calculations (in shares)	756	283	552	200
Restricted stock units
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Anti-dilutive securities, excluded from calculations (in shares)	2,304	0	1,088	12
Employee stock purchase plan
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Anti-dilutive securities, excluded from calculations (in shares)	0	1	0	2