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Per Share Data (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Dec. 29, 2023
Dec. 30, 2022
Schedule Of Earnings Per Share Basic And Diluted [Line Items]    
Net income attributable to Dolby Laboratories, Inc. $ 66,981 $ 79,375
Weighted average shares outstanding-basic (in shares) 95,376 95,905
Potential common shares from options to purchase common stock (in shares) 755 533
Potential common shares from restricted stock units (in shares) 1,289 566
Potential common shares from ESPP (in shares) 19 43
Weighted average shares outstanding-diluted (in shares) 97,439 97,047
Net income per share attributable to Dolby Laboratories, Inc. - Basic (in usd per share) $ 0.70 $ 0.83
Net income per share attributable to Dolby Laboratories, Inc. - Diluted (in usd per share) $ 0.69 $ 0.82
Stock options    
Schedule Of Earnings Per Share Basic And Diluted [Line Items]    
Anti-dilutive securities, excluded from calculations (in shares) 1,042 1,509
Restricted stock units    
Schedule Of Earnings Per Share Basic And Diluted [Line Items]    
Anti-dilutive securities, excluded from calculations (in shares) 36 350
Employee stock purchase plan    
Schedule Of Earnings Per Share Basic And Diluted [Line Items]    
Anti-dilutive securities, excluded from calculations (in shares) 95 10