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Derivative Instruments and Hedging Activities (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Oct. 31, 2019
Oct. 31, 2018
Oct. 31, 2019
Oct. 31, 2018
Apr. 30, 2019
Derivative Instruments and Hedging Activities [Abstract]          
Total debt outstanding $ 794.7   $ 794.7    
Unamortized debt issuance costs 0.8   0.8    
Variable rate loans outstanding 795.5   795.5    
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 0.3 $ 1.1 0.5 $ 2.0  
Interest Rate Swaps [Member] | Recurring [Member] | Level 2 [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]          
Derivative Instruments and Hedging Activities [Abstract]          
Liabilities fair value of derivative instrument $ 0.7   $ 0.7    
Assets fair value of derivative instrument         $ 0.5
Interest Rate Swaps [Member] | August 2019 Interest Rate Swap (Variable Rate Loans) [Member] | LIBOR [Member]          
Derivative Instruments and Hedging Activities [Abstract]          
Inception date     Aug. 07, 2019    
Fixed interest rate to be paid 1.40%   1.40%    
Term of variable rate     1 month    
Term of derivative instrument     3 years    
Expiration date     Aug. 15, 2022    
Notional amount of derivative liability $ 100.0   $ 100.0    
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%   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   $ 100.0    
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%   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   $ 350.0