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Summary of Significant Accounting Policies - Schedule of Unrealized Loss Recognized in AOCI (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2017
Sep. 24, 2016
Sep. 26, 2015
Accounting Policies [Abstract]      
Loss recognized in other comprehensive income, net $ 0.8 $ (3.4) $ (3.9)