Income taxes UTP (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012
Deferred Tax Liability Not Recognized [Line Items]
Balance at beginning of the year	$ 1,213	$ 1,202
Increases (decreases) in positions taken in a prior period	30	(52)
Increases in positions taken in a current period	200	89
Decreases due to lapse of statute of limitations	(70)	(26)
Balance at end of the year	1,373
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	81	82
Unrecognized Tax Benefits, Income Tax Penalties Accrued	$ 66