Annual report pursuant to Section 13 and 15(d)

Segment Information, Significant Customers and Geographic Information - Schedule of Revenue by Major Customers by Reporting Segments (Detail)

v2.4.0.8
Segment Information, Significant Customers and Geographic Information - Schedule of Revenue by Major Customers by Reporting Segments (Detail) (Sales [Member])
 12 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2012
Customer A [Member]
      
Revenue, Major Customer [Line Items]      
% of total revenue 24.00% 21.00% 14.00%
Customer B [Member]
      
Revenue, Major Customer [Line Items]      
% of total revenue 15.00% 18.00% 24.00%
Customer C [Member]
      
Revenue, Major Customer [Line Items]      
% of total revenue 10.00%