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CASH, CASH EQUIVALENTS AND INVESTMENTS - Available-for-Sale Securities (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jul. 31, 2023 | Jul. 31, 2022
Cash and Cash Equivalents |  |
Interest receivable | $ 600 |
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Current, Statement of Financial Position [Extensible Enumeration] | Investments |
Net unrealized holding losses for the Company's AFS securities | $ 700 | $ 700
Proceeds from sale of debt securities, available-for-sale | 0 |
Amounts of gains or losses reclassified out of other comprehensive income | 0 |
Available-for-sale securities |  |
Fair Value | 59,992 |
US Treasury notes |  |
Available-for-sale securities |  |
Amortized cost, Due in one to two years | 25,162 |
Amortized Cost, Due in two to three years | 35,550 |
Amortized Cost | 60,712 |
Gross Unrealized Losses, Due in one to two years | 276 |
Gross Unrealized Losses, Due in two to three years | 444 |
Gross Unrealized Losses | 720 |
Fair value, Due in one to two years | 24,886 |
Fair Value, Due in two to three years | 35,106 |
Fair Value | $ 59,992 |
Minimum | US Treasury notes |  |
Cash and Cash Equivalents |  |
Available-for-sale securities term | 2 years |
Maximum | US Treasury notes |  |
Cash and Cash Equivalents |  |
Available-for-sale securities term | 3 years |

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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) maturing in first and second fiscal year following current fiscal year. + References No definition available. + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year to second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
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