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Note 15. Income Taxes (Detail) - Details of Income Taxes (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Nov. 30, 2011	Nov. 30, 2010
Income before income taxes	$ 67,030	$ 59,554
Provision for income taxes	$ 21,486	$ 17,953
Effective tax rate	32.10%	30.10%

- 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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