Deferred Revenue and Deferred Cost - Schedule of Deferred Revenue and Related Cost (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2013	Jan. 31, 2012
Deferred Revenue and Deferred Cost [Line Items]
Deferred revenue on product shipments	$ 3,827	$ 6,968
Deferred revenue from licenses	485	1,955
Deferred cost of revenue on product shipments	(861)	(721)
Total deferred income	$ 3,451	$ 8,202