Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Additional Information (Detail)

v3.3.1.900
Long-Term Debt - Additional Information (Detail) - USD ($)
Sep. 23, 2015
Oct. 31, 2015
Jun. 03, 2015
Apr. 30, 2015
Debt Instrument [Line Items]        
Long-term debt   $ 0   $ 0
Standby Letters of Credit        
Debt Instrument [Line Items]        
Long-term debt arrangement   2,900,000   2,800,000
Amendment No. 3, Credit Agreement        
Debt Instrument [Line Items]        
Adjusted EBITDA $ 100,000,000      
Value of common shares repurchases permitted, dividends paid and permitted acquisitions for any fiscal year 135,000,000      
Value of common shares repurchases permitted and dividends paid for any fiscal year $ 85,000,000      
Amendment No. 3, Credit Agreement | Minimum        
Debt Instrument [Line Items]        
Quarterly fee on average daily unused amount of Credit Facilities 0.25%      
Amendment No. 3, Credit Agreement | Maximum        
Debt Instrument [Line Items]        
Quarterly fee on average daily unused amount of Credit Facilities 0.40%      
Amendment No. 3, Credit Agreement | London Interbank Offered Rate (LIBOR) | Minimum        
Debt Instrument [Line Items]        
Applicable margin on variable interest rate 1.125%      
Amendment No. 3, Credit Agreement | London Interbank Offered Rate (LIBOR) | Maximum        
Debt Instrument [Line Items]        
Applicable margin on variable interest rate 1.875%      
Amendment No. 3, Credit Agreement | Base Rate Loans | Minimum        
Debt Instrument [Line Items]        
Applicable margin on variable interest rate 0.125%      
Amendment No. 3, Credit Agreement | Base Rate Loans | Maximum        
Debt Instrument [Line Items]        
Applicable margin on variable interest rate 0.875%      
Amendment No. 3, Credit Agreement | Term Facility        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity $ 150,000,000      
Amendment No. 3, Credit Agreement | Revolving Credit Facility        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity $ 100,000,000      
Line of credit facility, extended maturity date Sep. 23, 2020      
Amendment No. 2, Credit Agreement        
Debt Instrument [Line Items]        
Adjusted EBITDA     $ 70,000,000  
Value of common shares repurchases permitted, dividends paid and permitted acquisitions for any fiscal year     125,000,000  
Value of common shares repurchases permitted and dividends paid for any fiscal year     75,000,000  
Amendment No. 2, Credit Agreement | Revolving Credit Facility        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity     $ 150,000,000  
Other Financial Institutions | Standby Letters of Credit        
Debt Instrument [Line Items]        
Long-term debt arrangement   $ 1,400,000   $ 1,600,000