Subsequent Events (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Apr. 30, 2015
Subsequent Events (Details) [Line Items]
Subsequent Event, Description	On May 19, 2015, the members of Patriot approved a merger agreement with a subsidiary of CHS Inc. (“CHS”) that would result in CHS acquiring 100% of the ownership interest in Patriot.
Additional Proceeds From Sales Of Business Affiliate And Productive Assets	$ 5
Subsequent Event [Member]
Subsequent Events (Details) [Line Items]
Proceeds from Sales of Business, Affiliate and Productive Assets	$ 44

Aggregate cash proceeds received from a combination of transactions in which noncurrent assets are sold, which may include the sale of a business, an investment in an affiliate (including an equity method investee), property, plant and equipment and intangible assets. Excludes sales of trading, available-for-sale, and held-to-maturity securities.

No definition available.

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