Annual report pursuant to Section 13 and 15(d)

Segment Information, Significant Customers and Geographic Information (Details)

v2.4.0.6
Segment Information, Significant Customers and Geographic Information (Details)
12 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2011
Customer A [Member]
     
Entity-Wide Revenue, Major Customer, Percentage 18.00% 24.00% 27.00%
Customer B [Member]
     
Entity-Wide Revenue, Major Customer, Percentage 12.00% 11.00% 11.00%
Customer C [Member]
     
Entity-Wide Revenue, Major Customer, Percentage     11.00%