Goodwill & Other Intangibles - Gross carrying amount and related accumulated amortization of definite-lived intangible assets (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Amount	$ 14,225	$ 13,500	$ 13,219
Accumulated Amortization	(6,069)	(4,819)	(3,807)
Net	8,156	8,681	9,412
Existing Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Amount	7,840	7,500	7,500
Accumulated Amortization	(4,164)	(3,375)	(2,637)
Net	3,676	4,125	4,863
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Amount	3,494	3,494	3,494
Accumulated Amortization	(525)	(300)	(155)
Net	2,969	3,194	3,339
Other Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Amount	2,891	2,506	2,225
Accumulated Amortization	(1,380)	(1,144)	(1,015)
Net	$ 1,511	$ 1,362	$ 1,210