CASH, CASH EQUIVALENTS AND INVESTMENTS (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2024	Jan. 31, 2024
Cash and Cash Equivalents
Accrued dividends	$ 0.6	$ 0.7
Accrued interest		$ 1.3
Held-to-maturity Securities
Cash and Cash Equivalents
Maturity period	1 year
Weighted average annual interest rates of CDs (as a percent)	5.50%	5.40%
Accrued interest	$ 1.5	$ 4.5