Income Taxes - Roll Forward of Uncertainties in its Income Tax Provision Liability (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013
Income Tax Disclosure [Abstract]
Gross balance at February 1	$ 2,259	$ 2,407
Additions based on tax positions related to the current year	218	146
Reductions for tax positions of prior years	(310)	(165)
Gross balance at January 31	$ 2,167	$ 2,259