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Per Share Data (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Jan. 01, 2016
Dec. 26, 2014
Schedule Of Earnings Per Share Basic And Diluted [Line Items]    
Document Period End Date Jan. 01, 2016  
Net income attributable to Dolby Laboratories, Inc. $ 30,901 $ 41,357
Weighted average shares outstanding-basic 100,734 102,303
Potential common shares from options to purchase common stock 599 992
Potential common shares from restricted stock units 598 980
Weighted average shares outstanding-diluted 101,931 104,275
Net income per share attributable to Dolby Laboratories, Inc. - Basic (in usd per share) $ 0.31 $ 0.40
Net income per share attributable to Dolby Laboratories, Inc. - Diluted (in usd per share) $ 0.30 $ 0.40
Stock Options [Member]    
Schedule Of Earnings Per Share Basic And Diluted [Line Items]    
Anti-dilutive securities, excluded from calculations (in shares) 5,698 2,683
Restricted Stock Units [Member]    
Schedule Of Earnings Per Share Basic And Diluted [Line Items]    
Anti-dilutive securities, excluded from calculations (in shares) 215 159