RELATED PARTIES (Details) (One Earth Energy [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
Jan. 31, 2014	Jan. 31, 2013
One Earth Energy [Member]
RELATED PARTIES (Details) [Line Items]
Related Party Transaction, Purchases from Related Party	$ 262.4	$ 275.8

Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

No definition available.

Name:	us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration