Income Taxes (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011
Unrecognized tax benefits
Beginning balance, February 1, 2011 and 2010	$ 408	$ 1,611
Gross increases for tax positions of prior years	458
Gross decreases for tax positions of prior years		(45)
Gross increases for tax positions of current year
Settlements		(7)
Lapse of statutes of limitation	(78)	(1,151)
Unrecognized tax benefits balance at January 31, 2012 and 2011	$ 788	$ 408