Income Taxes (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Unrecognized tax benefits
Unrecognized tax benefits as beginning of year	$ (3,300)	$ (3,350)	$ (3,327)
Increases (decreases) as a result of tax positions taken in prior years		50	(23)
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		$ (3,300)	$ (3,350)