CASH, CASH EQUIVALENTS AND INVESTMENTS (Details) - USD ($) $ in Millions	6 Months Ended
	Jul. 31, 2024	Jan. 31, 2024
Cash and Cash Equivalents
Accrued dividends	$ 0.6	$ 0.7
Accrued interest	$ 1.6	$ 1.3
Held-to-maturity Securities
Cash and Cash Equivalents
Maturity period	1 year
Weighted average annual interest rates of CDs (as a percent)	5.40%	5.40%
Accrued interest	$ 1.8	$ 4.5