Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]
Valuation allowance	$ 37,500,000	$ 42,300,000
Unrecognized tax benefits	234,000	224,000	1,498,000
Impact on effective tax rate if recognized	154,000	154,000
Interest and penalties	$ 110,000	$ 100,000