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CASH, CASH EQUIVALENTS AND INVESTMENTS - Available-for-Sale Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 31, 2024 | Oct. 31, 2023 | Oct. 31, 2024 | Oct. 31, 2023 | Jan. 31, 2024
Cash and Cash Equivalents |  |  |  |  |
Interest receivable | $ 1,300 |  | $ 1,300 |  | $ 1,300
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Current, Statement of Financial Position [Extensible Enumeration] | Investments |  | Investments |  | Investments
Proceeds from sale of debt securities, available-for-sale | $ 0 | $ 0 | $ 0 | $ 0 |
Amounts of gains or losses reclassified out of other comprehensive income | 0 | $ 0 | 0 | $ 0 |
Available-for-sale securities |  |  |  |  |
Amortized Cost | 206,394 |  | 206,394 |  | $ 105,623
Gross Unrealized Gains | 1,074 |  | 1,074 |  | 568
Gross Unrealized Losses | 1,025 |  | 1,025 |  | 307
Fair Value | 206,443 |  | 206,443 |  | 105,884
US Treasury notes |  |  |  |  |
Available-for-sale securities |  |  |  |  |
Amortized cost, Due within one year | 50,323 |  | 50,323 |  |
Amortized cost, Due in one to three years | 72,751 |  | 72,751 |  | 96,217
Amortized Cost, Due in three to five years | 73,274 |  | 73,274 |  |
Gross Unrealized Gains, Due within one year | 161 |  | 161 |  |
Gross Unrealized Gains, Due in one to three years | 488 |  | 488 |  | 568
Gross Unrealized Gains, Due in three to five years | 425 |  | 425 |  |
Gross Unrealized Losses, Due within one year | 32 |  | 32 |  |
Gross Unrealized Losses, Due in one to three years | 96 |  | 96 |  | 230
Gross Unrealized Losses, Due in three to five years | 784 |  | 784 |  |
Fair Value, Due in within one year | 50,452 |  | 50,452 |  |
Fair Value, Due in one to three years | 73,143 |  | 73,143 |  | 96,555
Fair Value, Due in three to five years | 72,915 |  | 72,915 |  |
U.S. corporate debt security |  |  |  |  |
Available-for-sale securities |  |  |  |  |
Amortized cost, Due in one to three years | 10,046 |  | 10,046 |  | 9,406
Gross Unrealized Losses, Due in one to three years | 113 |  | 113 |  | 77
Fair Value, Due in one to three years | $ 9,933 |  | $ 9,933 |  | $ 9,329

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