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Debt (Details) (USD $)
 9 Months Ended 12 Months Ended
May 31, 2013
May 31, 2012
Aug. 31, 2012
Debt Instrument [Line Items]      
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    
Proceeds from revolving credit facility 18,000,000 99,550,000  
Revolving credit facility, amount outstanding 63,000,000    
Minimum [Member]
      
Debt Instrument [Line Items]      
Consolidated earnings before interest, income taxes, depreciation and amortization $ 40,000,000