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Reconciliations of Income Tax Expense at U.S. Federal Statutory Income Tax Rate Compared to Actual Income Tax Expense (Parenthetical) (Detail)	12 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2010
Income Taxes [Line Items]
Percentage of statutory income tax rate	35.00%	35.00%	35.00%

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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