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Share-Based Compensation Plans (Assumptions Used In Estimating The Fair Value Of The Market-Based Performance Award) (Details) (Performance Awards [Member], USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2011
Performance Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares 120,101 177,616 294,158
Vesting price per share $ 22.00 $ 18.05 $ 17.00
Grant date share price per share $ 16.03 $ 9.55 $ 11.34
Volatility 54.20% 54.60% 49.80%
Dividend yield 0.00% 0.00% 0.00%
Risk-free rate 1.37% 0.62% 1.48%
Grant date Jul. 18, 2013 Jul. 19, 2012 Jul. 15, 2011
Fair value of award $ 1,651 $ 1,188 $ 2,647
Derived service period 7 months 6 days 1 year 4 months 24 days 10 months 24 days
Unrecognized compensation expense at 8/31/2013 $ 1,179 $ 148