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Marketable Securities Additional Information (Details) - Equity securities - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2016
Dec. 26, 2015
Schedule of Available-for-sale Securities [Line Items]    
Marketable Securities, Unrealized Gain (Loss) $ 4.0  
Realized Gain (Loss) on Marketable Securities, Cost Method Investments, and Other Investments   $ (25.1)