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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2012
Income Tax [Line Items]
Effective tax rate	30.00%	34.00%
Liabilities recorded for uncertain tax positions and related interest and penalties	$ 141		$ 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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