RECENT ACCOUNTING PRONOUNCEMENTS (Details) $ in Millions	3 Months Ended
Apr. 30, 2017 USD ($)
ASU No. 2016-09
RECENT ACCOUNTING PRONOUNCEMENTS
Cumulative-effect adjustment to retained earnings	$ 56

Amount of the cumulative effect on retained earnings net of related income tax effect.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22663-107794

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