Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income tax provisions	$ 1,292	$ 1,470
Effective tax rates	34.00%	28.90%
U.S. federal statutory tax rate	35.00%	35.00%
Discrete tax benefit	$ 200	$ 200
Permanent tax differences	300
Unrecognized tax benefits excluding interest and penalties that would impact effective tax rate	$ 1,000		$ 900