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Derivatives Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 01, 2017
Jun. 25, 2016
Jul. 01, 2017
Jun. 25, 2016
Sep. 26, 2015
Sep. 24, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]            
Interest Rate Cap Agreements Aggregate Premium Payable         $ 13.2  
Principal Amount Of Borrowings $ 1,000.0   $ 1,000.0      
Interest Payment Duration three-year          
Loss reclassified from accumulated other comprehensive loss to the statement of income $ (1.6) $ (1.2) (4.9) $ (2.2)    
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred     4.4      
Interest Rate Cash Flow Hedge Asset at Fair Value 2.6   2.6     $ 1.4
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments 1.1 0.2 4.0 0.8    
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax 3.5 $ 0.2 1.1 $ 0.6    
Notional Amount $ 42.3   $ 42.3