Per Share Data (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 01, 2022	Mar. 26, 2021	Apr. 01, 2022	Mar. 26, 2021
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net income attributable to Dolby Laboratories, Inc.	$ 36,720	$ 76,217	$ 116,734	$ 211,415
Weighted average shares outstanding-basic (in shares)	101,343	101,464	101,285	101,090
Potential common shares from options to purchase common stock (in shares)	962	2,102	1,160	1,980
Potential common shares from restricted stock units (in shares)	365	939	979	1,258
Potential common shares from ESPP (in shares)	37	76	53	86
Weighted average shares outstanding-diluted (in shares)	102,707	104,581	103,477	104,414
Net income per share attributable to Dolby Laboratories, Inc. - Basic (in usd per share)	$ 0.36	$ 0.75	$ 1.15	$ 2.09
Net income per share attributable to Dolby Laboratories, Inc. - Diluted (in usd per share)	$ 0.36	$ 0.73	$ 1.13	$ 2.02
Employee Stock Option [Member]
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Anti-dilutive securities, excluded from calculations (in shares)	635	283	507	159
Restricted Stock Units (RSUs) [Member]
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Anti-dilutive securities, excluded from calculations (in shares)	2,376	2	920	47
Employee Stock Purchase Plan [Member]
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Anti-dilutive securities, excluded from calculations (in shares)	15	0	0	0