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Derivative Instruments and Hedging Activities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2018
Jan. 31, 2017
Apr. 30, 2017
Derivative [Line Items]          
Variable rate loans outstanding $ 428.2 $ 865.7 $ 428.2 $ 865.7  
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Expense [Member]          
Derivative [Line Items]          
Net gain (losses) reclassified from Accumulated Other Comprehensive Loss 0.4   0.8   $ (1.1)
Interest Rate Swaps [Member] | Recurring [Member] | Level 2 [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]          
Derivative [Line Items]          
Assets fair value of derivative instrument $ 5.1   $ 5.1   $ 3.9
Interest Rate Swaps [Member] | April 2016 Interest Rate Swap (Variable Rate Loans) [Member] | LIBOR [Member]          
Derivative [Line Items]          
Inception date     Apr. 04, 2016    
Fixed interest rate to be paid 0.92%   0.92%    
Description of variable rate basis     one-month LIBOR    
Term of variable rate     1 month    
Term of derivative instrument     3 years    
Expiration date     May 15, 2019    
Notional amount of derivative liability $ 350.0 350.0 $ 350.0 350.0  
Forward Exchange Contracts [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Transaction Gains (Losses) [Member]          
Derivative [Line Items]          
Gain (loss) on fair value of derivative instruments   (11.5)   (53.2)  
Forward Exchange Contracts [Member] | Recurring [Member] | Level 2 [Member] | Not Designated as Hedging Instrument [Member] | Prepaid and Other Current Assets [Member]          
Derivative [Line Items]          
Gain recognized on derivative instruments   $ 54.5   $ 54.5