Per Share Data (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 30, 2022	Dec. 31, 2021
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net income attributable to Dolby Laboratories, Inc.	$ 79,375	$ 80,014
Weighted average shares outstanding-basic (in shares)	95,905	101,230
Potential common shares from options to purchase common stock (in shares)	533	1,348
Potential common shares from restricted stock units (in shares)	566	1,201
Potential common shares from ESPP (in shares)	43	22
Weighted average shares outstanding-diluted (in shares)	97,047	103,801
Net income per share attributable to Dolby Laboratories, Inc. - Basic (in usd per share)	$ 0.83	$ 0.79
Net income per share attributable to Dolby Laboratories, Inc. - Diluted (in usd per share)	$ 0.82	$ 0.77
Stock options
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Anti-dilutive securities, excluded from calculations (in shares)	1,509	413
Restricted stock units
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Anti-dilutive securities, excluded from calculations (in shares)	350	203
Employee stock purchase plan
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Anti-dilutive securities, excluded from calculations (in shares)	10	15