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Long-Term Debt - Additional Information (Detail)
12 Months Ended
Jun. 15, 2016
USD ($)
Apr. 30, 2017
USD ($)
Apr. 30, 2016
USD ($)
Debt Instrument [Line Items]      
Principal payment on term loan facility   $ 155,469,000 $ 10,000,000
Long-term debt   259,531,000  
Revolving Credit Facility      
Debt Instrument [Line Items]      
Line of credit facility borrowings   0 0
Standby Letters of Credit      
Debt Instrument [Line Items]      
Long-term debt arrangement   3,000,000 2,800,000
Other Financial Institutions | Standby Letters of Credit      
Debt Instrument [Line Items]      
Long-term debt arrangement   8,100,000 6,400,000
CSV of COLI Contracts      
Debt Instrument [Line Items]      
Outstanding policy loans   $ 67,200,000 68,400,000
CSV of COLI Contracts | Minimum      
Debt Instrument [Line Items]      
Average interest rate   4.76%  
CSV of COLI Contracts | Maximum      
Debt Instrument [Line Items]      
Average interest rate   8.00%  
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    
Credit Agreement | Minimum      
Debt Instrument [Line Items]      
Pro forma domestic liquidity $ 50,000,000    
Credit Agreement | Maximum      
Debt Instrument [Line Items]      
Pro forma leverage ratio 2.50    
Credit Agreement | London Interbank Offered Rate (LIBOR) | Minimum      
Debt Instrument [Line Items]      
Applicable margin on variable interest rate   1.25%  
Credit Agreement | London Interbank Offered Rate (LIBOR) | Maximum      
Debt Instrument [Line Items]      
Applicable margin on variable interest rate   2.00%  
Credit Agreement | Base Rate Loans | Minimum      
Debt Instrument [Line Items]      
Applicable margin on variable interest rate   0.25%  
Credit Agreement | Base Rate Loans | Maximum      
Debt Instrument [Line Items]      
Applicable margin on variable interest rate   1.00%  
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   $ 15,500,000  
Average interest rate   2.23%  
Long-term debt   $ 259,500,000 $ 140,000,000
Line of credit facility, maturity date   Jun. 15, 2021  
Credit Agreement | Term Facility | Minimum      
Debt Instrument [Line Items]      
Quarterly fee on average daily unused amount of Credit Facilities   0.20%  
Credit Agreement | Term Facility | Maximum      
Debt Instrument [Line Items]      
Quarterly fee on average daily unused amount of Credit Facilities   0.35%  
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