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Long-Term Debt - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Dec. 16, 2019
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2020
Jan. 31, 2019
Apr. 30, 2019
Revolving Credit Facility            
Debt Instrument [Line Items]            
Line of credit facility, remaining borrowing capacity   $ 646,000,000.0   $ 646,000,000.0   $ 420,200,000
Line of credit facility borrowings           226,900,000
Standby Letters of Credit            
Debt Instrument [Line Items]            
Long-term debt arrangement   4,000,000.0   4,000,000.0   2,900,000
Standby Letters of Credit | Other Financial Institutions            
Debt Instrument [Line Items]            
Long-term debt arrangement   11,100,000   $ 11,100,000   8,500,000
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%          
Percentage of principal amount redeemable with equity offering proceeds 35.00%          
Redemption price, percentage of principal amount redeemed 104.625%          
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   $ 402,000,000   $ 402,000,000    
4.625% Senior Unsecured Notes due 2027 | Maximum            
Debt Instrument [Line Items]            
Leverage ratio to be attained for payment of dividends 3.50          
Credit Agreement            
Debt Instrument [Line Items]            
Credit agreement initiation date Dec. 16, 2019          
Average interest rate   2.94% 3.64% 3.44% 3.42%  
Unamortized debt issuance costs   $ 4,500,000   $ 4,500,000   4,000,000.0
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   $ 226,900,000
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%