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INCOME TAXES - Research and Development Tax Credits (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2018 | Apr. 30, 2021 | Jan. 31, 2021 | Jan. 31, 2020 | Jan. 31, 2019
INCOME TAXES |  |  |  |  |
Prior period for identify and quantify the amounts of research and development credits | 3 years |  |  |  |
Research and development tax credit benefit |  |  |  | $ 0.4 | $ 16.6
Unrecognized income tax benefits related to research and development credits |  | $ 5.0 |  |  |
Income tax refunds and prepaid income taxes |  |  | $ 26.9 |  |

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