Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income tax provisions	$ 2,857	$ 1,929	$ 5,507	$ 4,879
Effective tax rates	41.60%	33.00%	42.90%	31.50%
U.S. federal statutory tax rate	35.00%		35.00%
Unrecognized tax benefits excluding interest and penalties that would impact effective tax rate	$ 1,000		$ 1,000		$ 900