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Long-Term Debt - Additional Information (Detail) - USD ($)
3 Months Ended
Jun. 15, 2016
Jul. 31, 2016
Apr. 30, 2016
Debt Instrument [Line Items]      
Principal payment on term loan facility   $ 140,000,000  
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   2,800,000 2,800,000
Other Financial Institutions | Standby Letters of Credit      
Debt Instrument [Line Items]      
Long-term debt arrangement   $ 5,600,000 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%    
Long-term debt   $ 275,000,000 $ 140,000,000
Line of credit facility, maturity date   Jun. 15, 2021  
Average interest rate   2.40%  
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