FAIR VALUE MEASUREMENTS - OTHER FAIR VALUE DISCLOSURES (Details) (USD $) In Millions, unless otherwise specified	Jul. 31, 2014	Jan. 31, 2014
Term Loans \| Level 3
Assets and Liabilities Measured at Fair Value on Recurring Basis
Term Loans - Disclosure of Fair Value	$ 411	$ 647
1.50% Convertible Senior Notes \| Level 2
Assets and Liabilities Measured at Fair Value on Recurring Basis
Convertible Notes - Disclosure of Fair Value	$ 407

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Convertible Security

-URI http://asc.fasb.org/extlink&oid=6509036

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant