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Per Share Data (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2023
Apr. 01, 2022
Mar. 31, 2023
Apr. 01, 2022
Schedule Of Earnings Per Share Basic And Diluted [Line Items]        
Net income attributable to Dolby Laboratories, Inc. $ 95,696 $ 36,720 $ 175,071 $ 116,734
Weighted average shares outstanding-basic (in shares) 95,820 101,343 95,862 101,285
Potential common shares from options to purchase common stock (in shares) 838 962 683 1,160
Potential common shares from restricted stock units (in shares) 569 365 795 979
Potential common shares from ESPP (in shares) 71 37 52 53
Weighted average shares outstanding-diluted (in shares) 97,298 102,707 97,392 103,477
Net income per share attributable to Dolby Laboratories, Inc. - Basic (in usd per share) $ 1.00 $ 0.36 $ 1.83 $ 1.15
Net income per share attributable to Dolby Laboratories, Inc. - Diluted (in usd per share) $ 0.98 $ 0.36 $ 1.80 $ 1.13
Stock options        
Schedule Of Earnings Per Share Basic And Diluted [Line Items]        
Anti-dilutive securities, excluded from calculations (in shares) 997 635 910 507
Restricted stock units        
Schedule Of Earnings Per Share Basic And Diluted [Line Items]        
Anti-dilutive securities, excluded from calculations (in shares) 1,406 2,376 177 920
Employee stock purchase plan        
Schedule Of Earnings Per Share Basic And Diluted [Line Items]        
Anti-dilutive securities, excluded from calculations (in shares) 0 15 5 0