DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION (Details) - VIE - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Apr. 30, 2019	Jan. 31, 2019
Description of the Business
Cost of property, plant and equipment	$ 3.2	$ 2.1
Total amounts of notes receivable	$ 3.4	$ 2.1

Carrying amount as of the balance sheet date, net of allowance for doubtful accounts, of account and note receivables due from other than related parties.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3-4)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_AccountsAndNotesReceivableNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant