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Credit Facility - Interest Rate Swaps (Details)
$ in Millions
Oct. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Oct. 31, 2016
USD ($)
instrument
Line of Credit Facility [Line Items]      
Effective portion of cash flow hedges included in accumulated other comprehensive loss, before tax $ 1.7   $ 0.2
Interest Rate Swap      
Line of Credit Facility [Line Items]      
Number of interest rate swap agreements | instrument     3
Notional amount   $ 500.0 $ 105.0
Derivative, fixed interest rate     1.05%
Minimum | Interest Rate Swap      
Line of Credit Facility [Line Items]      
Derivative, fixed interest rate   1.65%  
Maximum | Interest Rate Swap      
Line of Credit Facility [Line Items]      
Derivative, fixed interest rate   1.69%