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Debt (Details) (USD $)
12 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2012
Debt [Abstract]      
Revolving credit facility, amount $ 125,000,000 $ 75,000,000  
Revolving credit facility, maturity period 5 years 3 years  
Revolving credit facility, expiration date Jan. 07, 2018 Jun. 17, 2014  
LIBOR margin rate 0.85% 0.90%  
Commitment fee annual rate 0.85% 0.90%  
Commitment fee, annual rate applied to amount not borrowed 0.12% 0.15%  
Outstanding loans and letters of credit maximum amount 62,500,000    
Consolidated earnings before interest, income taxes, depreciation and amortization 40,000,000    
Proceeds from revolving credit facility 35,000,000 18,000,000 114,550,000
Revolving credit facility, amount outstanding $ 98,000,000