Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Additional Information (Detail)

v3.21.2
Long-Term Debt - Additional Information (Detail) - USD ($)
3 Months Ended
Dec. 16, 2019
Jul. 31, 2021
Apr. 30, 2021
Revolving Credit Facility      
Debt Instrument [Line Items]      
Line of credit facility, remaining borrowing capacity   $ 644,500,000 $ 646,000,000
Standby Letters of Credit      
Debt Instrument [Line Items]      
Long-term debt arrangement   5,500,000 4,000,000.0
Standby Letters of Credit | Other Financial Institutions      
Debt Instrument [Line Items]      
Long-term debt arrangement   $ 11,700,000 11,000,000.0
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   $ 415,500,000 416,500,000
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    
Unamortized debt issuance costs   $ 3,100,000 3,300,000
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 4.00    
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%