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Related Party Transactions (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 29, 2017
Sep. 30, 2016
Sep. 25, 2015
Aug. 05, 2015
Related party rent expense $ 3,142 $ 3,097 $ 3,136  
Distributions to principal stockholder (2,094) (214) (5,615)  
Deconsolidation of Subsidiary        
Gain on sale (pretax) 0 0 26,221  
Proceeds from sale of ownership interest in subsidiary (net) $ 0 $ 0 27,216  
Cash acquired by purchaser     $ 4,100  
Dolby Properties, LLC [Member]        
Ownership interest (percent)     37.50%  
Deconsolidation of Subsidiary        
Cash consideration received [1]       $ 31,263
Less: net book value of Dolby Properties, LLC       $ (5,042)
Gain on sale (pretax)     $ 26,200  
Dolby Properties Brisbane, LLC [Member]        
Ownership interest (percent) 49.00%      
Dolby Properties Burbank, LLC [Member]        
Ownership interest (percent) 49.00%      
Dolby Properties United Kingdom, LLC [Member]        
Ownership interest (percent) 49.00%      
Dolby Properties, LP [Member]        
Ownership interest (percent) 10.00%      
[1] (1)Net cash proceeds from the sale of $27.2 million as disclosed within our consolidated statements of cash flows is derived by deducting cash balances of $4.1 million held by the Subsidiary and acquired by the Purchaser from gross cash consideration received of $31.3 million.