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Long-Term Debt - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 15, 2016
Oct. 31, 2016
Oct. 31, 2016
Apr. 30, 2016
Debt Instrument [Line Items]        
Principal payment on term loan facility     $ 145,156,000  
Revolving Credit Facility        
Debt Instrument [Line Items]        
Line of credit facility borrowings   $ 0 0 $ 0
Standby Letters of Credit        
Debt Instrument [Line Items]        
Long-term debt arrangement   3,000,000 3,000,000 2,800,000
Other Financial Institutions | Standby Letters of Credit        
Debt Instrument [Line Items]        
Long-term debt arrangement   6,900,000 $ 6,900,000 6,400,000
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      
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   5,200,000    
Long-term debt   $ 269,800,000 $ 269,800,000 $ 140,000,000
Line of credit facility, maturity date     Jun. 15, 2021  
Average interest rate   2.44% 2.43%  
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