INCOME TAXES - Net Operating Loss Carryback (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Jan. 31, 2020
INCOME TAXES
Increase in loss carryback period for certain losses	5 years
Domestic net operating loss carryback			$ 39.5
Federal corporate income tax rate (as percent)	21.00%	21.00%
Income tax refunds	$ 12.7