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Investments and Restricted Deposits (Detail) (USD $)	3 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Jan. 31, 2013
Restricted Investments	$ 203,000		$ 203,000
Retained Earnings, Undistributed Earnings from Equity Method Investees	22,600,000		21,200,000
Proceeds from Equity Method Investment, Dividends or Distributions	200,000	2,000,000
Patriot And Big River [Member]
Proportionate Share of Restricted Net Assets	370,400,000		367,600,000
Money Market Funds [Member]
Money Market Mutual Fund Fair Value Disclosure	$ 300,000		$ 300,000

X

- Definition

Fair value of money market mutual fund as of the reporting date.

+ References

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+ Details

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X

- Definition

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

+ References

No definition available.

+ Details

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X

- 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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X

- Definition

Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

+ References

No definition available.

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X

- Definition

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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