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INCOME TAXES - Research and Development Tax Credits (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Oct. 31, 2019 | Jan. 31, 2019 | Oct. 31, 2017
INCOME TAXES |  |  |
Period for identify and quantify the amounts of research and development credits | 3 years |  |
Research and development tax credit benefit |  |  | $ 16.6
Unfavorable adjustment | $ 0.4 |  |
Unrecognized income tax benefits related to research and development credits | $ 4.9 | $ 5.1 |

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