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Debt and Available Credit Facilities (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jul. 31, 2019
Apr. 30, 2022
Apr. 30, 2021
Apr. 30, 2020
May 30, 2019
Components of Total Debt Outstanding [Abstract]          
Short-term portion of long-term debt [1]   $ 18,750 $ 12,500    
Total long-term debt, less current portion   768,277 809,088    
Total debt   787,027 821,588    
Unamortized issuance costs   300 500    
Annual Maturities of Long-term Debt, Including Short-term Portion [Abstract]          
2023   18,750      
2024   204,688      
2025   563,934      
Total   $ 787,372      
Amended and Restated RCA [Member]          
Debt and Available Credit Facilities [Abstract]          
Term of credit facility   5 years      
Costs incurred $ 4,000        
Total costs capitalized 5,200        
Amortization expense of the lender and non-lender fees in interest expense   $ 1,100 1,100 $ 1,000  
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]   $ 204,343 222,928    
Debt and Available Credit Facilities [Abstract]          
Credit agreement face amount         $ 250,000
Total costs capitalized 900        
Term Loan amount related to lender fees as a reduction to debt 800        
Term Loan amount related to non-lender fees in Other NC Assets 100        
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   $ 563,934 $ 586,160    
Debt and Available Credit Facilities [Abstract]          
Amount of financing available under credit facilities         $ 1,250,000
Total costs capitalized $ 4,300        
Line of Credit [Member]          
Debt and Available Credit Facilities [Abstract]          
Amount of financing available under credit facilities   1,500,000      
Unused lines of credit   $ 700,000      
Weighted average interest rate on total debt outstanding during the period   2.02% 2.03%    
Weighted average interest rate on total debt at period end   2.55% 1.98%    
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      
Minimum increments in which optional credit limit increase may be requested   $ 50,000      
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%      
Other Credit Facilities [Member] | Line of Credit [Member]          
Debt and Available Credit Facilities [Abstract]          
Amount of financing available under credit facilities   $ 1,000      
Outstanding borrowings under revolving credit facilities   $ 0 $ 0    
[1] Relates to our term loan A under the Amended and Restated RCA.
[2] Amounts are shown net of unamortized issuance costs of $0.3 million as of April 30, 2022 and $0.5 million as of April 30, 2021.