Other Income (Expense), Net (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Component of Other Expense, Nonoperating
Interest income	$ 2,360	$ 1,944	$ 2,195
Foreign currency exchange gain (loss)	(1,872)	(2,394)	(718)
Gain on converstion of equity method investment to controlling interest	0	0	(1,519)
Other, net	(1,008)	(982)	(1,420)
Other income (expense), net	$ 520	$ 1,432	$ (1,576)