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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2012
Income Tax [Line Items]
Effective tax rate	35.00%	31.00%
Liabilities recorded for uncertain tax positions and related interest and penalties	$ 122		$ 120

- 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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