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Derivative Instruments and Hedging Activities (Details) - USD ($)
$ in Millions
3 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Apr. 30, 2019
Derivative Instruments and Hedging Activities [Abstract]      
Total debt outstanding $ 730.5    
Unamortized debt issuance costs 0.8    
Variable rate loans outstanding 731.3    
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 0.2 $ 1.0  
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 $ 0.3   $ 0.5
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%    
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] | June 2019 Interest Rate Swap (Variable Rate Loans) [Member] | LIBOR [Member]      
Derivative Instruments and Hedging Activities [Abstract]      
Inception date Jun. 24, 2019    
Fixed interest rate to be paid 1.65%    
Term of variable rate 1 month    
Term of derivative instrument 3 years    
Expiration date Jul. 15, 2022    
Notional amount of derivative liability $ 100.0