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INCOME TAXES - Research and Development Tax Credits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jan. 31, 2025 | Jan. 31, 2024 | Jan. 31, 2023
INCOME TAXES |  |  |
Prior period for identify and quantify the amounts of research and development credits | 3 years |  |
Research and development tax credit benefit | $ 16,200 |  |
Unrecognized income tax benefits related to research and development credits | 5,000 |  |
Unfavorable tax expense adjustment | 6,200 |  |
Contract Assets | 4,400 |  |
Federal research and development tax credits | 5,800 |  |
Development tax credit |  |  | $ 2,400
Deferred Tax Assets, Operating Loss Carryforwards, Foreign | 13,700 |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 1,400 | $ 2,100 | $ 2,600
Income tax refunds and prepaid income taxes | $ 30,881 | $ 18,267 |

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