INCOME TAXES - Income Tax Expense Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Jan. 31, 2019
INCOME TAXES
Computed expected income tax benefit (expense)	$ 6,391	$ (1,382)
Foreign tax rate differential	(754)	13
State income taxes, net of federal tax effect	78	(158)
Stock options	205
Net operating loss deemed unrealizable	(5,316)
Adjustments and other permanent differences	(83)	(210)
Income tax benefit (expense)	521	$ (1,737)
Deferred tax valuation allowance	5,300
Prepaid income taxes	$ 15,300		$ 19,500