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Other Income (Expense), Net (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Oct. 31, 2011
Component of Other Expense, Nonoperating [Line Items]
Interest Income	$ 458	$ 519	$ 1,407	$ 1,588
Foreign currency exchange gain (loss)	(243)	211	(1,059)	(183)
Gain on Converstion of Equity Method Investment To Controlling Interest	0	1,519	0	1,519
Other, net	(158)	(413)	(587)	(1,034)
Other income (expense), net	$ 57	$ 1,836	$ (239)	$ 1,890

The aggregate foreign currency transaction gain (loss) (both realized and unrealized) included in determining net income for the reporting period. Excludes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. For certain enterprises, primarily banks, that are dealers in foreign exchange, foreign currency transaction gains (losses) may be disclosed as dealer gains (losses).

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