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Debt (Details Textual) (USD $)
 0 Months Ended 12 Months Ended
Jun. 17, 2011
Aug. 31, 2012
Oct. 17, 2011
Aug. 31, 2011
Debt (Additional Textual) [Abstract]        
Term loan amount   $ 75,000,000    
Term loan fixed interest rate   7.28%    
Term loan maturity period   10 years    
Current portion of term loan   0 10,700,000 10,715,000
Term loan, interest paid   200,000    
Revolving credit facility, amount 75,000,000      
Revolving credit facility, maturity period 3 years      
Revolving credit facility, expiration date Jun. 17, 2014      
LIBOR margin rate 0.90%      
Commitment fee annual rate   0.90%    
Commitment fee, annual rate applied to amount not borrowed   0.15%    
Outstanding loans and letters of credit maximum amount   37,500,000    
Additional withdrawal from revolving credit facility   114,600,000    
Revolving credit facility, amount repaid   69,600,000    
Revolving credit facility, amount outstanding   45,000,000   0
Revolving credit facility, associated interest   400,000    
Minimum [Member]
        
Debt (Textual) [Abstract]        
Consolidated earnings before interest, income taxes, depreciation and amortization   $ 40,000,000