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Derivatives Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Mar. 31, 2018
Apr. 01, 2017
Sep. 30, 2017
Sep. 26, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]            
Interest Rate Cap Agreements Aggregate Premium Payable         $ 1.9 $ 13.2
Borrowed principal $ 1,000.0   $ 1,000.0      
Loss reclassified from accumulated other comprehensive loss to the statement of income (0.3) $ (1.2) (2.6) $ (3.3)    
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred     1.6      
Interest Rate Cash Flow Hedge Asset at Fair Value         $ 4.8  
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments 2.1 1.8 2.3 3.0    
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax 1.7 $ 3.9 0.2 $ 4.5    
Notional Amount $ 106.1   $ 106.1