Interest expense, net (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012
Interest expense, net [Abstract]
Interest Expense	$ 2,327	$ 2,165
Interest Income, Other	(511)	(728)
Interest expense, net	$ (1,816)	$ (1,437)