Per Share Data (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 29, 2024	Mar. 31, 2023	Mar. 29, 2024	Mar. 31, 2023
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net income attributable to Dolby Laboratories, Inc.	$ 97,830	$ 95,696	$ 164,811	$ 175,071
Weighted average shares outstanding-basic (in shares)	95,718	95,820	95,547	95,862
Potential common shares from options to purchase common stock (in shares)	639	838	695	683
Potential common shares from restricted stock units (in shares)	495	569	1,143	795
Potential common shares from ESPP (in shares)	4	71	12	52
Weighted average shares outstanding-diluted (in shares)	96,856	97,298	97,397	97,392
Net income per share attributable to Dolby Laboratories, Inc. - Basic (in usd per share)	$ 1.02	$ 1.00	$ 1.72	$ 1.83
Net income per share attributable to Dolby Laboratories, Inc. - Diluted (in usd per share)	$ 1.01	$ 0.98	$ 1.69	$ 1.80
Stock options
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Anti-dilutive securities, excluded from calculations (in shares)	1,217	997	1,129	910
Restricted stock units
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Anti-dilutive securities, excluded from calculations (in shares)	8	1,406	4	177
Employee stock purchase plan
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Anti-dilutive securities, excluded from calculations (in shares)	101	0	72	5