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INCOME TAXES - Research and Development Tax Credits (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Oct. 31, 2018 | Oct. 31, 2018 | 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 | $ 16.5 | $ 16.5 | $ 5.0 | $ 11.0 | $ 0.5
Effects on dilutive earnings per share, research and development activities | $ 1.05 | $ 1.05 |  |  |
Deferred tax valuation allowance | $ 0.7 | $ 0.7 |  |  |
Unrecognized income tax benefits related to research and development credits | $ 5.3 | $ 5.3 |  |  |
Unrecognized tax benefits related to research and development credits that would impact effective tax rate, if recognized |  |  | $ 2.3 | $ 2.7 | $ 0.3

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