Income Taxes - Schedule of Income Taxes from Continuing Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Current provision (benefit):
U.S. Federal	$ 1,355	$ (890)	$ 2,125
U.S. State	192	51	(72)
International	41	41	54
Total current provision (benefit)	1,588	(798)	2,107
Deferred provision (benefit):
U.S. Federal	(1,505)	(2,006)	1,085
U.S. State	(117)	(271)	(85)
Total deferred (benefit) provision	(1,622)	(2,277)	1,000
Income tax (benefit) provision	$ (34)	$ (3,075)	$ 3,107