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Debt and Available Credit Facilities (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Apr. 30, 2020
May 30, 2019
Components of Total Debt Outstanding [Abstract]        
Short-term portion of long-term debt [1] $ 10,938   $ 9,375  
Total long-term debt, less current portion 835,763   765,650  
Total Debt 846,701   775,025  
Amended and Restated RCA [Member]        
Debt and Available Credit Facilities [Abstract]        
Costs incurred   $ 4,000    
Credit agreement issuance costs capitalized   5,200    
Amortization expense of the lender and non-lender fees in interest expense 300 200    
Term Loan A Facility [Member] | Amended and Restated RCA [Member]        
Components of Total Debt Outstanding [Abstract]        
Total long-term debt, less current portion [2] 232,179   235,263  
Unamortized issuance costs $ 600   700  
Debt and Available Credit Facilities [Abstract]        
Term of credit facility 5 years      
Credit agreement face amount       $ 250,000
Credit agreement issuance 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] | Amended and Restated RCA [Member]        
Components of Total Debt Outstanding [Abstract]        
Total long-term debt, less current portion $ 603,584   $ 530,387  
Debt and Available Credit Facilities [Abstract]        
Term of credit facility 5 years      
Amount of financing available under credit facilities       $ 1,250,000
Credit agreement issuance costs capitalized   $ 4,300    
Revolving Credit Facility [Member] | Syndicate Bank Group led by Bank of America [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      
Revolving Credit Facility [Member] | Syndicate Bank Group led by Bank of America [Member] | Amended and Restated RCA [Member] | Minimum [Member]        
Debt and Available Credit Facilities [Abstract]        
Line of credit facility fee percentage 0.15%      
Revolving Credit Facility [Member] | Syndicate Bank Group led by Bank of America [Member] | Amended and Restated RCA [Member] | Maximum [Member]        
Debt and Available Credit Facilities [Abstract]        
Line of credit facility fee percentage 0.25%      
Revolving Credit Facility [Member] | Syndicate Bank Group led by Bank of America [Member] | Amended and Restated RCA [Member] | LIBOR [Member] | Minimum [Member]        
Debt and Available Credit Facilities [Abstract]        
Applicable margin 0.98%      
Revolving Credit Facility [Member] | Syndicate Bank Group led by Bank of America [Member] | Amended and Restated RCA [Member] | LIBOR [Member] | Maximum [Member]        
Debt and Available Credit Facilities [Abstract]        
Applicable margin 1.50%      
Revolving Credit Facility [Member] | Syndicate Bank Group led by Bank of America [Member] | Amended and Restated RCA [Member] | Base Rate [Member] | Minimum [Member]        
Debt and Available Credit Facilities [Abstract]        
Applicable margin 0.00%      
Revolving Credit Facility [Member] | Syndicate Bank Group led by Bank of America [Member] | Amended and Restated RCA [Member] | Base Rate [Member] | Maximum [Member]        
Debt and Available Credit Facilities [Abstract]        
Applicable margin 0.50%      
Revolving Credit Facility [Member] | Syndicate Bank Group led by Bank of America [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%      
Revolving Credit Facility [Member] | Syndicate Bank Group led by Bank of America [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 $0.6 million as of July 31, 2020 and $0.7 million as of April 30, 2020.