INCOME TAXES - INCOME TAX (PROVISION) BENEFIT (Detail) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Income (Loss) before taxes by component
Domestic													$ 4,057	$ 2,732	$ 1,994
Foreign													(886)	(774)	(11)
Income before income taxes													3,171	1,958	1,983
Federal—current													(127)	(129)	(84)
Federal—deferred													8,291	0	621
State—current													(20)	(16)	(10)
State—deferred													2,748	0	13
Foreign—current													29	146	3
Total	$ 11,012	$ (17)	$ (74)	$ 0	$ 96	$ 0	$ (79)	$ (16)	$ (32)	$ 578	$ 0	$ (3)	$ 10,921	$ 1	$ 543