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Debt and Available Credit Facilities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2021
Oct. 31, 2020
Apr. 30, 2021
May 30, 2019
Components of Total Debt Outstanding [Abstract]            
Short-term portion of long-term debt [1] $ 12,500   $ 12,500   $ 12,500  
Total long-term debt, less current portion 1,032,505   1,032,505   809,088  
Total debt 1,045,005   1,045,005   821,588  
Unamortized issuance costs 400   $ 400   500  
Amended and Restated RCA [Member]            
Debt and Available Credit Facilities [Abstract]            
Term of credit facility     5 years      
Amortization expense of the lender and non-lender fees in interest expense 300 $ 300 $ 500 $ 500    
Term Loan A Facility [Member]            
Debt and Available Credit Facilities [Abstract]            
Term of credit facility     5 years      
Term Loan A Facility [Member] | Amended and Restated RCA [Member]            
Components of Total Debt Outstanding [Abstract]            
Total long-term debt, less current portion [2] 217,187   $ 217,187   222,928  
Debt and Available Credit Facilities [Abstract]            
Credit agreement face amount           $ 250,000
Revolving Credit Facility [Member]            
Debt and Available Credit Facilities [Abstract]            
Term of credit facility     5 years      
Revolving Credit Facility [Member] | Amended and Restated RCA [Member]            
Components of Total Debt Outstanding [Abstract]            
Total long-term debt, less current portion 815,318   $ 815,318   $ 586,160  
Debt and Available Credit Facilities [Abstract]            
Amount of financing available under credit facilities           $ 1,250,000
Syndicate Bank Group led by Bank of America [Member] | Revolving Credit Facility [Member] | Amended and Restated RCA [Member]            
Debt and Available Credit Facilities [Abstract]            
Optional credit limit increase available on request 500,000   500,000      
Minimum increments in which optional credit limit increase may be requested 50,000   50,000      
Unused borrowing capacity under our Amended and Restated RCA and other facilities $ 435,300   $ 435,300      
Syndicate Bank Group led by Bank of America [Member] | Revolving Credit Facility [Member] | Amended and Restated RCA [Member] | Minimum [Member]            
Debt and Available Credit Facilities [Abstract]            
Line of credit facility fee percentage     0.15%      
Syndicate Bank Group led by Bank of America [Member] | Revolving Credit Facility [Member] | Amended and Restated RCA [Member] | Maximum [Member]            
Debt and Available Credit Facilities [Abstract]            
Line of credit facility fee percentage     0.25%      
Syndicate Bank Group led by Bank of America [Member] | Revolving Credit Facility [Member] | Amended and Restated RCA [Member] | LIBOR [Member] | Minimum [Member]            
Debt and Available Credit Facilities [Abstract]            
Applicable margin     0.98%      
Syndicate Bank Group led by Bank of America [Member] | Revolving Credit Facility [Member] | Amended and Restated RCA [Member] | LIBOR [Member] | Maximum [Member]            
Debt and Available Credit Facilities [Abstract]            
Applicable margin     1.50%      
Syndicate Bank Group led by Bank of America [Member] | Revolving Credit Facility [Member] | Amended and Restated RCA [Member] | Base Rate [Member] | Minimum [Member]            
Debt and Available Credit Facilities [Abstract]            
Applicable margin     0.00%      
Syndicate Bank Group led by Bank of America [Member] | Revolving Credit Facility [Member] | Amended and Restated RCA [Member] | Base Rate [Member] | Maximum [Member]            
Debt and Available Credit Facilities [Abstract]            
Applicable margin     0.50%      
Syndicate Bank Group led by Bank of America [Member] | Revolving Credit Facility [Member] | Amended and Restated RCA [Member] | Federal Funds Effective Rate [Member]            
Debt and Available Credit Facilities [Abstract]            
Margin rate over reference rate used in determining base rate     0.50%      
Syndicate Bank Group led by Bank of America [Member] | Revolving Credit Facility [Member] | Amended and Restated RCA [Member] | Eurocurrency Rate [Member]            
Debt and Available Credit Facilities [Abstract]            
Margin rate over reference rate used in determining base rate     1.00%      
[1] Relates to our term loan A under the Amended and Restated RCA.
[2] Amounts are shown net of unamortized issuance costs of $0.4 million as of October 31, 2021 and $0.5 million as of April 30, 2021.