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Derivative Instruments and Hedging Activities (Details) - USD ($)
$ in Millions
3 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Apr. 30, 2018
Derivative Instruments and Hedging Activities [Abstract]      
Variable rate loans outstanding $ 507.5   $ 360.0
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Expense [Member]      
Derivative Instruments and Hedging Activities [Abstract]      
Net gain (losses) reclassified from Accumulated Other Comprehensive Loss 1.0 $ 0.1  
Interest Rate Swaps [Member] | Recurring [Member] | Level 2 [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]      
Derivative Instruments and Hedging Activities [Abstract]      
Assets fair value of derivative instrument $ 4.3   5.1
Interest Rate Swaps [Member] | April 2016 Interest Rate Swap (Variable Rate Loans) [Member] | LIBOR [Member]      
Derivative Instruments and Hedging Activities [Abstract]      
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   $ 350.0