Income Taxes (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012
A reconciliation of unrecognized tax benefits, excluding interest and penalties
Balance at February 1	$ 780	$ 727
Increases in prior period tax positions	16	31
Increases in current period tax positions	386	79
Reductions related to lapse of statute of limitations	(241)	(57)
Balance at January 31	$ 941	$ 780