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Income Taxes - Summary of Reconciliation of Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]
Unrecognized tax benefits at the beginning of the year	$ 1,498	$ 1,581
Increases in tax positions for prior years	34	46
Decreases in tax positions for prior years	(1,308)	(32)
Lapse of statute of limitations	0	(97)
Unrecognized tax benefits at the ending of the year	$ 224	$ 1,498

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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