XML 77 R61.htm IDEA: XBRL DOCUMENT v3.20.2
Long-Term Debt - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Dec. 16, 2019
Oct. 31, 2019
Oct. 31, 2020
Oct. 31, 2019
Apr. 30, 2020
Revolving Credit Facility          
Debt Instrument [Line Items]          
Line of credit facility, remaining borrowing capacity     $ 646,000,000.0   $ 646,000,000.0
Standby Letters of Credit          
Debt Instrument [Line Items]          
Long-term debt arrangement     4,000,000.0   4,000,000.0
Standby Letters of Credit | Other Financial Institutions          
Debt Instrument [Line Items]          
Long-term debt arrangement     $ 10,100,000   11,300,000
4.625% Senior Unsecured Notes due 2027          
Debt Instrument [Line Items]          
Debt instrument, interest rate 4.625%        
Principal amount $ 400,000,000        
Debt instrument, unamortized discount $ 4,500,000        
Debt instrument, maturity date     Dec. 15, 2027    
Debt instrument, interest rate terms     interest payable semi-annually in arrears on June 15 and December 15 of each year, commencing on June 15, 2020    
Interest payment commencing date     Jun. 15, 2020    
Redemption price, percentage 100.00%        
Dividends payable per fiscal year $ 25,000,000        
Debt Instrument, change in control and rating decline, percentage of principal amount 101.00%        
Debt instrument, proceeds from offering used to repay outstanding debt $ 276,900,000        
Interest rate, effective percentage     4.86%    
Debt instrument, fair value     $ 406,500,000   372,500,000
4.625% Senior Unsecured Notes due 2027 | Maximum          
Debt Instrument [Line Items]          
Leverage ratio to be attained for payment of dividends 3.50        
Redemption before December 15, 2022          
Debt Instrument [Line Items]          
Percentage of principal amount redeemable with equity offering proceeds 35.00%        
Percentage of principal amount of debt redeemed 104.625%        
Credit Agreement          
Debt Instrument [Line Items]          
Credit agreement initiation date Dec. 16, 2019        
Average interest rate   3.37%   3.53%  
Unamortized debt issuance costs     $ 3,800,000   4,200,000
Credit Agreement | Revolving Credit Facility          
Debt Instrument [Line Items]          
Debt instrument term 5 years        
Line of credit facility, maximum borrowing capacity $ 650,000,000.0        
Line of credit facility, maturity date     Dec. 16, 2024    
Long-term debt     $ 0   $ 0
Credit Agreement | Maximum          
Debt Instrument [Line Items]          
Leverage ratio to be attained for payment of dividends 4.25        
Credit Agreement | Maximum | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Applicable margin on variable interest rate     2.00%    
Credit Agreement | Maximum | Base Rate Loans          
Debt Instrument [Line Items]          
Applicable margin on variable interest rate     1.00%    
Credit Agreement | Maximum | Revolving Credit Facility          
Debt Instrument [Line Items]          
Quarterly commitment fee on average daily unused amount of Credit Facilities     0.35%    
Credit Agreement | Minimum          
Debt Instrument [Line Items]          
Pro forma liquidity $ 50,000,000.0        
Credit Agreement | Minimum | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Applicable margin on variable interest rate     1.125%    
Credit Agreement | Minimum | Base Rate Loans          
Debt Instrument [Line Items]          
Applicable margin on variable interest rate     0.125%    
Credit Agreement | Minimum | Revolving Credit Facility          
Debt Instrument [Line Items]          
Quarterly commitment fee on average daily unused amount of Credit Facilities     0.175%