INCOME TAXES - Income Tax Expense Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
INCOME TAXES
Federal corporate income tax rate (as percent)				21.00%	21.00%
Computed expected income tax benefit (expense)			$ 7,532	$ (6,266)
State income taxes, net of federal tax effect			490	(1,176)
Net operating loss deemed unrealizable			(6,112)
Bad debt loss			(5,016)
Foreign tax differential			(838)	94
Stock options			204	5
Adjustments and other permanent differences			640	(708)
Income tax benefit (expense)	$ 6,411	$ (6,314)	6,932	$ (8,051)
Deferred tax valuation allowance	6,100		6,100
Partial income tax benefit Offset	$ 5,900		$ 5,900