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Debt (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Nov. 30, 2013
Aug. 31, 2012
Debt Instrument [Line Items]    
Revolving credit facility, amount $ 125.0 $ 75.0
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 62.5  
Revolving credit facility, amount outstanding 63.0  
Minimum [Member]
    
Debt Instrument [Line Items]    
Consolidated earnings before interest, income taxes, depreciation and amortization $ 40.0