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Related-Party Transactions (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended		3 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013 One Earth Energy [Member]	Jul. 31, 2012 One Earth Energy [Member]
Related-Party Transactions (Details) [Line Items]
Related Party Transaction, Purchases from Related Party	$ 150.4	$ 120.9	$ 78.7	$ 64.4

X

- Details

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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

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