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Other Income (Expense), Net (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Component of Other Expense, Nonoperating [Line Items]
Interest income	$ 2,195	$ 1,390	$ 1,003
Foreign currency exchange loss	(718)	(1,148)	(423)
Gain on conversion of equity method investment to controlling interest	1,519
Equity in losses of unconsolidated entities	(127)	(938)	(995)
Other, net	(1,293)	(1,420)	(513)
Other income (expense), net	$ 1,576	$ (2,116)	$ (928)

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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