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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
	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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effects on dilutive earnings per share

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Represents income tax expense (benefits) associated with research and development activities.

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Represents period for identify and quantify the amounts of research and development credits.

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Represents unrecognized income tax benefits related to research and development credits.

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- Definition

The total amount of unrecognized tax benefits related to research and development credits that, if recognized, would affect the effective tax rate.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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