Segment Information, Significant Customers and Geographic Information - Long-Lived Assets by Geographic Locations (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2015	Jan. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets by geographic location	$ 28,502	$ 33,272
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets by geographic location	21,214	20,714
Long-lived assets, Percentage	74.00%	62.00%
Europe and Middle East [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets by geographic location	6,028	11,097
Long-lived assets, Percentage	22.00%	33.00%
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets by geographic location	$ 1,260	$ 1,461
Long-lived assets, Percentage	4.00%	5.00%