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INCOME TAXES - Research and Development Tax Credits (Details) - USD ($) $ in Millions | Jan. 31, 2020 | Jan. 31, 2019
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INCOME TAXES |  |
Research and development tax credit benefit |  | $ 16.6
Unfavorable adjustment | $ 0.4 |
Income tax refunds and prepaid income taxes | 14.5 |
Prepaid Taxes |  | 19.5
Unrecognized income tax benefits related to research and development credits | $ 5.0 | $ 5.1

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