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Total Income Tax Expense Computed by Applying US Federal Statutory Tax Rates to Pre-Tax Income (Parenthetical) (Detail)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Reconciliation of Provision of Income Taxes [Line Items]
Total expense (benefit), U.S. Statutory tax rate	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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