Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Income Taxes ( Textual) [ Abstract]
Benefit of state net operating loss carryforwards, net of federal effect, from change in tax regulations	$ (1,216)
Increase deferred tax assets excluding state net operating loss carryforwards	679
Unrecognized tax benefits related to uncertain income tax positions	1,957
Unrecognized tax benefits related to uncertain income tax position accrued interest and penalties	341	577	(386)
Recognized liabilities for unrecognized tax benefits that impact effective tax rate	2,985
Recoverable income taxes	648
Gross unrecognized tax benefits increase for uncertain tax positions	399
Approximate gross unrecognized tax benefit that would impact the effective tax rate	$ 278