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Related-Party Transactions (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended		3 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013 One Earth Energy [Member]	Oct. 31, 2012 One Earth Energy [Member]
Related-Party Transactions (Details) [Line Items]
Related Party Transaction, Purchases from Related Party	$ 208.0	$ 199.9	$ 57.6	$ 79.0

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- Details

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- Definition

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

+ References

No definition available.

+ Details

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