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Share-Based Compensation Plans (Assumptions Used To Estimate The Stated Fair Value Of The Stock Options Awarded ) (Details) (Stock Options [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Aug. 31, 2011	Aug. 31, 2010
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date share price per share	$ 8.43	$ 5.28
Volatility	59.02%	51.47%
Dividend yield	0.00%	0.00%
Risk-free rate	0.70%	1.57%
Fair value of award	$ 756	$ 493
Derived service period	10 months 24 days	1 year 9 months 18 days

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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