CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS (Details) - Held-to-maturity Securities	3 Months Ended	12 Months Ended
Apr. 30, 2022	Jan. 31, 2022
Cash and Cash Equivalents
Maturity period	1 year	1 year
Weighted average annual interest rates of CDs (as a percent)	0.90%	0.10%

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