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)

v3.3.1.900
Segment Information, Significant Customers and Geographic Information - Schedule of Revenue by Major Customers by Reporting Segments (Detail) - Customer Concentration Risk [Member] - Total Revenue [Member]
 12 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2014
Revenue, Major Customer [Line Items]      
% of total revenues 10.00% 10.00% 10.00%
Customer A [Member]      
Revenue, Major Customer [Line Items]      
% of total revenues 28.00% 17.00% 24.00%
Customer B [Member]      
Revenue, Major Customer [Line Items]      
% of total revenues 10.00% 17.00% 15.00%
Customer C [Member]      
Revenue, Major Customer [Line Items]      
% of total revenues     10.00%