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Related Party Transactions (Details) - USD ($)
shares in Millions, $ in Millions
Sep. 26, 2015
Sep. 27, 2014
Sep. 28, 2013
Equity, Class of Treasury Stock [Line Items]      
Short-term non-interest bearing loans outstanding to investment/profit sharing plan $ 0.0 $ 0.4  
Shares authorized for repurchase     4.0
Class B Common Stock      
Equity, Class of Treasury Stock [Line Items]      
Shares authorized for repurchase   2.5 1.5
Purchase price of shares   $ 65.0 $ 37.1