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Income Taxes (Schedule Of Provision (Benefit) For Income Taxes And Effective Income Tax Rate) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	May 31, 2012	May 31, 2011	May 31, 2012	May 31, 2011
Income Taxes [Abstract]
Provision (benefit) for income taxes	$ 8,667	$ (2,742)	$ 13,125	$ 2,195
Effective income tax rate	37.60%	37.10%	37.80%	24.00%

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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