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FAIR VALUE MEASUREMENTS - Financial Instruments on a Recurring Basis (Details) - USD ($) $ in Thousands | Jul. 31, 2024 | Jan. 31, 2024
--- | --- | ---
Fair value of assets and liabilities measured on recurring and nonrecurring basis |  |
Available-for-sale securities | $ 182,705 | $ 105,884
Level 1 Inputs | Fair value, recurring |  |
Fair value of assets and liabilities measured on recurring and nonrecurring basis |  |
Totals | 144,956 | 126,646
Level 1 Inputs | Fair value, recurring | Money market funds |  |
Fair value of assets and liabilities measured on recurring and nonrecurring basis |  |
Cash equivalents | 144,956 | 126,646
Level 2 Inputs | Fair value, recurring |  |
Fair value of assets and liabilities measured on recurring and nonrecurring basis |  |
Totals | 182,705 | 105,884
Level 2 Inputs | Fair value, recurring | U.S. Treasury notes |  |
Fair value of assets and liabilities measured on recurring and nonrecurring basis |  |
Available-for-sale securities | 172,658 | 96,555
Level 2 Inputs | Fair value, recurring | U.S. corporate debt security |  |
Fair value of assets and liabilities measured on recurring and nonrecurring basis |  |
Available-for-sale securities | $ 10,047 | $ 9,329

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