(Provision) Benefit for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Current:
Federal	$ 475	$ (826)	$ (1,846)
State	137	250	407
Foreign	(2,731)	9,028	3,501
Total current	(2,119)	8,452	2,062
Deferred:
Federal and state	695	468	(163)
Foreign	361	(5,492)	349
Total deferred	1,056	(5,024)	186
Provision (benefit) for income taxes	$ (1,063)	$ 3,428	$ 2,248