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INCOME TAXES - Research and Development Tax Credits (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Jan. 31, 2019 | Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2016
INCOME TAXES |  |  |  |
Period for identify and quantify the amounts of research and development credits | 3 years |  |  |
Income tax expense (benefits) associated with research and development activities | $ 16.6 | $ 5.2 | $ 10.9 | $ 0.5
Effects on dilutive earnings per share, research and development activities | $ 1.06 |  |  |
Unrecognized income tax benefits related to research and development credits | $ 5.1 |  |  |
Unrecognized tax benefits related to research and development credits that would impact effective tax rate, if recognized | $ 2.2 | $ 2.6 | $ 0.3 |

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