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Derivative Instruments and Hedging Activities (Details)
£ in Millions, $ in Millions
3 Months Ended
Jul. 31, 2017
USD ($)
Jul. 31, 2016
USD ($)
Contract
Apr. 30, 2017
USD ($)
Jul. 31, 2016
GBP (£)
Contract
Derivative [Line Items]        
Variable rate loans outstanding $ 551.6      
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 0.1 $ (0.5)    
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 $ 3.4   $ 3.9  
Liability fair value of derivative instrument   2.1    
Interest Rate Swaps [Member] | Recurring [Member] | Level 2 [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Other Accrued Liabilities [Member]        
Derivative [Line Items]        
Liability fair value of derivative instrument   0.1    
Interest Rate Swaps [Member] | Recurring [Member] | Level 2 [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Other Long-Term Liabilities [Member]        
Derivative [Line Items]        
Liability fair value of derivative instrument   $ 2.0    
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%      
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      
Interest Rate Swaps [Member] | August 2014 Interest Rate Swap (Variable Rate Loans) [Member] | LIBOR [Member]        
Derivative [Line Items]        
Inception date Aug. 15, 2014      
Fixed interest rate to be paid 0.65%      
Description of variable rate basis one-month LIBOR      
Term of variable rate 1 month      
Term of derivative instrument 2 years      
Expiration date Aug. 15, 2016      
Notional amount of derivative liability $ 150.0      
Forward Exchange Contracts [Member] | Not Designated as Hedging Instrument [Member]        
Derivative [Line Items]        
Number of open derivative contracts held | Contract   2   2
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   $ 39.3    
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   $ 40.6    
Foreign Exchange Forward One [Member] | Not Designated as Hedging Instrument [Member]        
Derivative [Line Items]        
Notional amount of derivative liability | £       £ 274
Foreign Exchange Forward Two [Member] | Not Designated as Hedging Instrument [Member]        
Derivative [Line Items]        
Notional amount of derivative liability | £       £ 75