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Investments (Details) (USD $)	9 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Jan. 31, 2014
Investments (Details) [Line Items]
Proceeds from Equity Method Investment, Dividends or Distributions	$ 19,881,000	$ 200,000
Patriot And Big River [Member]
Investments (Details) [Line Items]
Retained Earnings, Undistributed Earnings from Equity Method Investees	37,000,000		32,600,000
Proceeds from Equity Method Investment, Dividends or Distributions	19,900,000	200,000
Proportionate Share of Restricted Net Assets	$ 448,700,000		$ 366,200,000

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- Definition

Proportionate share of restricted net assets as of the reporting date.

+ References

No definition available.

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- Definition

This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 13

-Article 5

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Amount of consolidated retained earnings that represent undistributed (not yet received) earnings from 50% or less owned persons accounted for by the equity method (equity method investees).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 852

-SubTopic 20

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6462270&loc=d3e57205-112772

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