Other Income (Expense), Net (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Component of Other Expense, Nonoperating [Line Items]
Interest Income	$ 1,944	$ 2,195	$ 1,390
Foreign currency exchange gain (loss)	(2,394)	(718)	(1,148)
Gain (Loss) on Converstion of Equity Method Investment To Controlling Interest	0	1,519	0
Other, net	(982)	(1,420)	(2,358)
Other income (expense), net	$ (1,432)	$ 1,576	$ (2,116)