REVENUE RECOGNITION REVENUE RECOGNITION - COSTS TO OBTAIN AND FULFILL CONTRACTS (Details) $ in Millions	3 Months Ended	9 Months Ended
Oct. 31, 2018 USD ($)	Oct. 31, 2018 USD ($)
Sales Commission
Capitalized Contract Cost [Line Items]
Capitalized Contract Cost, Net	$ 29.1	$ 29.1
Capitalized Contract Cost, Amortization	10.8	32.4
Costs to Fulfill
Capitalized Contract Cost [Line Items]
Capitalized Contract Cost, Net	14.0	14.0
Capitalized Contract Cost, Amortization	6.0	13.8
Prepaid Expenses and Other Current Assets \| Sales Commission
Capitalized Contract Cost [Line Items]
Capitalized Contract Cost, Net	5.1	5.1
Other Assets \| Sales Commission
Capitalized Contract Cost [Line Items]
Capitalized Contract Cost, Net	24.0	24.0
Deferred cost of revenue \| Costs to Fulfill
Capitalized Contract Cost [Line Items]
Capitalized Contract Cost, Net	9.7	9.7
Long-term deferred cost of revenue \| Costs to Fulfill
Capitalized Contract Cost [Line Items]
Capitalized Contract Cost, Net	$ 4.3	$ 4.3

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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