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Per Share Data (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Sep. 26, 2025
Sep. 27, 2024
Sep. 29, 2023
Schedule Of Earnings Per Share Basic And Diluted [Line Items]      
Net income attributable to Dolby Laboratories, Inc. $ 255,018 $ 261,825 $ 200,656
Weighted Average Number of Shares Outstanding, Basic 95,868 95,544 95,771
Potential common shares from options to purchase Class A and Class B common stock 358 586 763
Potential common shares from restricted stock units 1,213 1,158 1,139
Incremental Common Shares Attributable To Employee Stock Purchase Plan 40 37 60
Weighted Average Number of Shares Outstanding, Diluted 97,479 97,325 97,733
Basic (usd per share) $ 2.66 $ 2.74 $ 2.10
Net income per share attributable to Dolby Laboratories, Inc. - Diluted $ 2.62 $ 2.69 $ 2.05
Employee Stock [Member]      
Schedule Of Earnings Per Share Basic And Diluted [Line Items]      
Anti-dilutive securities, excluded from calculations 1 3 2
Employee Stock Option [Member]      
Schedule Of Earnings Per Share Basic And Diluted [Line Items]      
Anti-dilutive securities, excluded from calculations 1,448 1,152 930
Restricted Stock Units [Member]      
Schedule Of Earnings Per Share Basic And Diluted [Line Items]      
Anti-dilutive securities, excluded from calculations 1 10 7