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Per Share Data (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Jul. 01, 2022
Jun. 30, 2023
Jul. 01, 2022
Schedule Of Earnings Per Share Basic And Diluted [Line Items]        
Net income attributable to Dolby Laboratories, Inc. $ 16,399 $ 39,597 $ 191,470 $ 156,331
Weighted average shares outstanding-basic (in shares) 95,658 100,213 95,794 100,936
Potential common shares from options to purchase common stock (in shares) 847 779 746 1,037
Potential common shares from restricted stock units (in shares) 896 409 986 916
Potential common shares from ESPP (in shares) 58 73 62 104
Weighted average shares outstanding-diluted (in shares) 97,459 101,474 97,588 102,993
Net income per share attributable to Dolby Laboratories, Inc. - Basic (in usd per share) $ 0.17 $ 0.40 $ 2.00 $ 1.55
Net income per share attributable to Dolby Laboratories, Inc. - Diluted (in usd per share) $ 0.17 $ 0.39 $ 1.96 $ 1.52
Stock options        
Schedule Of Earnings Per Share Basic And Diluted [Line Items]        
Anti-dilutive securities, excluded from calculations (in shares) 997 756 907 552
Restricted stock units        
Schedule Of Earnings Per Share Basic And Diluted [Line Items]        
Anti-dilutive securities, excluded from calculations (in shares) 5 2,304 142 1,088
Employee stock purchase plan        
Schedule Of Earnings Per Share Basic And Diluted [Line Items]        
Anti-dilutive securities, excluded from calculations (in shares) 5 0 2 0