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INCOME TAXES - Income Tax Expense Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Computed expected income tax (expense) benefit	$ (5,226)	$ 10,030	$ (9,916)
State income taxes, net of federal tax effect	(7)	81	683
Net operating loss carryback benefit	4,392
Excess executive compensation	(420)	(420)	(866)
Net operating loss carryforward adjustments	242		1,730
Foreign tax rate differential	173	(722)	86
Bad debt loss	160	6,205
Elimination of net operating loss benefit		(7,239)
Goodwill impairment losses		(763)	(266)
Other permanent differences, net	(468)	31	(421)
Federal research and development tax credits			13,866
Adjustments and other differences	80	(150)	(245)
Income tax (expense) benefit	(1,074)	7,053	4,651
Deferred tax valuation allowance	11,797	$ 11,588
Tax benefit from subsidiaries	200
Research and development state tax credit			$ 2,800
Income tax benefit recorded as an adjustment to the estimated favorable income tax impact of bad debt loss on loans	6,800
United Kingdom
Deferred tax valuation allowance	$ 7,100

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