Income Taxes - Unrecognized Tax Benefits Excluding Potential Penalties and Interest (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Income Tax Disclosure [Abstract]
Unrecognized tax benefits as beginning of year		$ (3,300)	$ (3,350)
Increases (decreases) as a result of tax positions taken in prior years	254		50
Increases as a result of tax positions taken in current year
Settlements		3,300
Lapse of statute of limitations
Unrecognized tax benefits as of end of year	$ 254		$ (3,300)