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RELATED PARTIES (Detail) (One Earth Energy [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
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Jan. 31, 2013 | Jan. 31, 2012
One Earth Energy [Member] |  |
Related Party Transaction, Purchases from Related Party | $ 275.8 | $ 265.5

X
- Definition Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration