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Derivative Instruments and Activities (Details)
$ in Thousands, € in Millions
12 Months Ended
Apr. 30, 2021
USD ($)
Apr. 30, 2020
USD ($)
Apr. 30, 2019
USD ($)
Apr. 30, 2021
EUR (€)
Derivative Instruments and Activities [Abstract]        
Total debt outstanding $ 821,588 $ 775,025    
Unamortized debt issuance costs 500 700    
Variable rate loans outstanding 822,100      
Foreign exchange transaction losses (7,977) 2,773 $ (6,016)  
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]        
Derivative Instruments and Activities [Abstract]        
Notional Amount 400 300    
Unrecognized gains to be reclassified into net income in the next twelve months 3,200      
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Expense [Member]        
Derivative Instruments and Activities [Abstract]        
Net gains (losses) reclassified from Accumulated Other Comprehensive Loss (3,700) 400 $ 4,700  
Interest Rate Swaps [Member] | Recurring [Member] | Level 2 [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]        
Derivative Instruments and Activities [Abstract]        
Assets fair value of derivative instrument $ 5,600 8,300    
Interest Rate Swaps [Member] | April 2021 Interest Rate Swap Variable Rate Loans [Member] | LIBOR [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]        
Derivative Instruments and Activities [Abstract]        
Hedged Item Amended and Restated RCA      
Inception date Apr. 12, 2021      
Nature of Swap Pay fixed/receive variable      
Notional Amount $ 100 0    
Fixed Interest Rate 0.50%     0.50%
Term of variable rate 1 month      
Term of derivative instrument 3 years      
Expiration date Apr. 15, 2024      
Interest Rate Swaps [Member] | February 2020 Interest Rate Swap Variable Rate Loans [Member] | LIBOR [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]        
Derivative Instruments and Activities [Abstract]        
Hedged Item Amended and Restated RCA      
Inception date Feb. 26, 2020      
Nature of Swap Pay fixed/receive variable      
Notional Amount $ 100 100    
Fixed Interest Rate 1.15%     1.15%
Term of variable rate 1 month      
Term of derivative instrument 3 years      
Expiration date Mar. 15, 2023      
Interest Rate Swaps [Member] | August 2019 Interest Rate Swap (Variable Rate Loans) [Member] | LIBOR [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]        
Derivative Instruments and Activities [Abstract]        
Hedged Item Amended and Restated RCA      
Inception date Aug. 07, 2019      
Nature of Swap Pay fixed/receive variable      
Notional Amount $ 100 100    
Fixed Interest Rate 1.40%     1.40%
Term of variable rate 1 month      
Term of derivative instrument 3 years      
Expiration date Aug. 15, 2022      
Interest Rate Swaps [Member] | June 2019 Interest Rate Swap (Variable Rate Loans) [Member] | LIBOR [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]        
Derivative Instruments and Activities [Abstract]        
Hedged Item Amended and Restated RCA      
Inception date Jun. 24, 2019      
Nature of Swap Pay fixed/receive variable      
Notional Amount $ 100 $ 100    
Fixed Interest Rate 1.65%     1.65%
Term of variable rate 1 month      
Term of derivative instrument 3 years      
Expiration date Jul. 15, 2022      
Interest Rate Swaps [Member] | April 2016 Interest Rate Swap (Variable Rate Loans) [Member] | LIBOR [Member]        
Derivative Instruments and Activities [Abstract]        
Inception date Apr. 04, 2016      
Notional Amount $ 350,000      
Fixed Interest Rate 0.92%     0.92%
Term of variable rate 1 month      
Term of derivative instrument 3 years      
Expiration date May 15, 2019      
Forward Exchange Contracts [Member] | Not Designated as Hedging Instrument [Member]        
Derivative Instruments and Activities [Abstract]        
Open derivative contract $ 38,800     € 32
Foreign exchange transaction losses $ (800)