Investments and Restricted Deposits (Detail) - Schedule Of Income Loss Recognized From Equity Method Investments (USD $) In Thousands, unless otherwise specified	3 Months Ended
Apr. 30, 2013	Apr. 30, 2012
Income Loss From Equity Method Investments	$ 1,599	$ 442
Big River [Member]
Income Loss From Equity Method Investments	644	557
Patriot [Member]
Income Loss From Equity Method Investments	$ 955	$ (115)

- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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