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Note 14. Stock-Based Compensation (Detail) - Stock-Based Compensation Expense (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Nov. 30, 2011	Nov. 30, 2010
Stock-based compensation	$ 5,880	$ 3,677
Tax impact of stock-based compensation	(1,887)	(1,195)
Stock-based compensation, net of tax	$ 3,993	$ 2,482

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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