FAIR VALUE MEASUREMENTS - OTHER FAIR VALUE DISCLOSURES (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Jul. 31, 2017	Jan. 31, 2017
Term Loans \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Term Loans - Fair Value	$ 427	$ 410
1.50% Convertible Senior Notes \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions
1.50% Convertible Senior Notes - Fair Value	$ 388	$ 381
Minimum \| Option to Acquire Noncontrolling Interests
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Fair Value Inputs, Discount Rate	12.50%	12.50%
Minimum \| Contingent Consideration
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Fair Value Inputs, Discount Rate	3.00%	3.00%
Maximum \| Option to Acquire Noncontrolling Interests
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Fair Value Inputs, Discount Rate	14.00%	14.00%
Maximum \| Contingent Consideration
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Fair Value Inputs, Discount Rate	20.00%	20.00%

Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

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