Other Income, Net (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Component Of Other Income And Expense [Line Items]
Gain from disposal of property and equipment	$ 470	$ 1,293	$ 4,716	$ 2,734
Interest income	17	28	60	151
Currency exchange (loss) gain	(102)	(687)	(768)	273
Other	(265)	487	(47)	946
Total	$ 120	$ 1,121	$ 3,961	$ 4,104