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CASH, CASH EQUIVALENTS AND INVESTMENTS - Available-for-Sale Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 31, 2025 | Jul. 31, 2024 | Jul. 31, 2025 | Jul. 31, 2024 | Jan. 31, 2025
Cash and Cash Equivalents |  |  |  |  |
Interest receivable | $ 2,500 |  | $ 2,500 |  | $ 2,100
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 | 294,953 |  | 294,953 |  | $ 227,156
Gross Unrealized Gains | 2,228 |  | 2,228 |  | 631
Gross Unrealized Losses | 517 |  | 517 |  | 1,042
Estimated Fair Value | 296,664 |  | 296,664 |  | 226,745
US Treasury notes |  |  |  |  |
Available-for-sale securities |  |  |  |  |
Amortized Cost, Due within one year | 60,809 |  | 60,809 |  | 50,676
Amortized Cost, Due in one to three years | 69,085 |  | 69,085 |  | 84,881
Amortized Cost, Due in three to five years | 165,059 |  | 165,059 |  | 91,599
Gross Unrealized Gains, Due within one year | 33 |  | 33 |  | 126
Gross Unrealized Gains, Due in one to three years | 661 |  | 661 |  | 381
Gross Unrealized Gains, Due in three to five years | 1,534 |  | 1,534 |  | 124
Gross Unrealized Losses, Due within one year | 38 |  | 38 |  | 7
Gross Unrealized Losses, Due in one to three years | 10 |  | 10 |  | 105
Gross Unrealized Losses, Due in three to five years | 469 |  | 469 |  | 930
Estimated Fair Value, Due within one year | 60,804 |  | 60,804 |  | 50,795
Estimated Fair Value, Due in one to three years | 69,736 |  | 69,736 |  | 85,157
Estimated Fair Value, Due in three to five years | $ 166,124 |  | $ 166,124 |  | $ 90,793

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