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Employee Benefit And Cash Incentive Plans (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2012
Defined Contribution Plans [Line Items]      
Employer contributions $ 1.3 $ 1.9 $ 1.7
Incentive bonus expense $ 6.5 $ 6.7 $ 4.9
Maximum [Member]
     
Defined Contribution Plans [Line Items]      
Employer contributions, percentage 6.00%