Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Statement of Income and Comprehensive Income [Abstract]
Tax amount related to unrealized net gains (losses) on investment securities	$ (9)	$ 10	$ (7)	$ 2
Tax amount related to foreign currency translation adjustments	(534)	38	(623)	(90)
Tax amount related to unrealized net gains (losses) on interest rate derivative contracts	$ 2,306	$ 7,274	$ (1,480)	$ 7,545

Tax effect of the adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into functional currency of the reporting entity. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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Tax effect on the change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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- Definition

Tax effect on gross appreciation or the gross loss in value of the total of unsold securities during the period being reported on.

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