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CASH, CASH EQUIVALENTS AND INVESTMENTS - Available-for-Sale Securities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jan. 31, 2025 | Jan. 31, 2024
Cash and Cash Equivalents |  |
Interest receivable | $ 2,100 | $ 1,300
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Current, Statement of Financial Position [Extensible Enumeration] | Investments | Investments
Proceeds from sale of debt securities, available-for-sale | $ 0 | $ 0
Amounts of gains or losses reclassified out of other comprehensive income | 0 | 0
Available-for-sale securities |  |
Amortized Cost | 227,156 | 105,623
Gross Unrealized Gains | 631 | 568
Gross Unrealized Losses | 1,042 | 307
Estimated Fair Value | 226,745 | 105,884
US Treasury notes |  |
Available-for-sale securities |  |
Amortized Cost, Due within one year | 50,676 |
Amortized Cost, Due in one to three years | 84,881 | 96,217
Amortized Cost, Due in three to five years | 91,599 |
Gross Unrealized Gains, Due within one year | 126 |
Gross Unrealized Gains, Due in one to three years | 381 | 568
Gross Unrealized Gains, Due in three to five years | 124 |
Gross Unrealized Losses, Due within one year | 7 |
Gross Unrealized Losses, Due in one to three years | 105 | 230
Gross Unrealized Losses, Due in three to five years | 930 |
Estimated Fair Value, Due within one year | 50,795 |
Estimated Fair Value, Due in one to three years | 85,157 | 96,555
Estimated Fair Value, Due in three to five years | $ 90,793 |
U.S. corporate debt security |  |
Available-for-sale securities |  |
Amortized Cost, Due in one to three years |  | 9,406
Gross Unrealized Losses, Due in one to three years |  | 77
Estimated Fair Value, Due in one to three years |  | $ 9,329

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