INCOME TAXES - Unrecognized tax benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
INCOME TAXES
Balance at beginning of year	$ 0	$ 16
Additions for tax positions	0	10
Settlements	0	(26)
Balance at end of year	$ 0	$ 0