Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Income Tax Disclosure [Abstract]
U.S. federal statutory tax rate	35.00%	35.00%	35.00%
Discrete tax benefit				$ 200
Income tax expense (benefit) from discontinued operations		$ (100)	$ 500		$ 1,100
Income tax benefit from sale of discontinued operations					$ 600
Deferred tax asset valuation allowance	$ 5,721	4,836
Unrecognized tax benefits excluding interest and penalties that would impact effective tax rate	900	900	1,000
Liability for unrecognized tax benefits to change significantly in the next 12 months	$ 600	$ 600	$ 700