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Long-Term Debt - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 15, 2016
USD ($)
Oct. 31, 2018
USD ($)
Oct. 31, 2017
Oct. 31, 2018
USD ($)
Oct. 31, 2017
USD ($)
Apr. 30, 2018
USD ($)
Debt Instrument [Line Items]            
Principal payment on term loan facility       $ 12,031,000 $ 10,313,000  
Revolving Credit Facility            
Debt Instrument [Line Items]            
Line of credit facility borrowings   $ 0   0   $ 0
Line of credit facility, remaining borrowing capacity   122,100,000   122,100,000    
Standby Letters of Credit            
Debt Instrument [Line Items]            
Long-term debt arrangement   2,900,000   2,900,000   2,900,000
Standby Letters of Credit | Other Financial Institutions            
Debt Instrument [Line Items]            
Long-term debt arrangement   8,100,000   8,100,000   7,400,000
Credit Agreement            
Debt Instrument [Line Items]            
Credit agreement initiation date Jun. 15, 2016          
Line of credit facility, maximum borrowing capacity $ 400,000,000          
Line of credit facility borrowings 275,000,000          
Principal payment on term loan facility $ 140,000,000          
Unamortized debt issuance costs   $ 2,300,000   $ 2,300,000   2,700,000
Credit Agreement | Maximum            
Debt Instrument [Line Items]            
Pro forma leverage ratio 2.50          
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 | Minimum            
Debt Instrument [Line Items]            
Pro forma domestic liquidity $ 50,000,000          
Credit Agreement | Minimum | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Applicable margin on variable interest rate       1.25%    
Credit Agreement | Minimum | Base Rate Loans            
Debt Instrument [Line Items]            
Applicable margin on variable interest rate       0.25%    
Credit Agreement | Term Facility            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity $ 275,000,000          
Term loan amortization percentage year one 7.50%          
Term loan amortization percentage year two 7.50%          
Term loan amortization percentage year three 10.00%          
Term loan amortization percentage year four 10.00%          
Term loan amortization percentage year five 10.00%          
Principal payment on term loan facility       $ 12,000,000    
Average interest rate   3.39% 2.49% 3.31% 2.41%  
Line of credit facility, maturity date       Jun. 15, 2021    
Long-term debt   $ 226,900,000   $ 226,900,000   $ 238,900,000
Credit Agreement | Term Facility | Maximum            
Debt Instrument [Line Items]            
Quarterly fee on average daily unused amount of Credit Facilities       0.35%    
Credit Agreement | Term Facility | Minimum            
Debt Instrument [Line Items]            
Quarterly fee on average daily unused amount of Credit Facilities       0.20%    
Credit Agreement | Revolving Credit Facility            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity $ 125,000,000          
Line of credit facility, maturity date       Jun. 15, 2021