Quarterly report pursuant to Section 13 or 15(d)

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

v2.4.0.8
Significant Customers and Geographic Information - Schedule of Revenue by Major Customers by Reporting Segments (Detail) (Sales [Member])
3 Months Ended 6 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2013
Jul. 31, 2012
Customer A [Member]
       
Entity Wide Portfolio Carrying Amount, Major Customer [Line Items]        
Entity-Wide Revenue, Major Customer, Percentage 22.00% 17.00% 27.00% 17.00%
Customer B [Member]
       
Entity Wide Portfolio Carrying Amount, Major Customer [Line Items]        
Entity-Wide Revenue, Major Customer, Percentage 15.00% 22.00% 15.00% 19.00%
Customer C [Member]
       
Entity Wide Portfolio Carrying Amount, Major Customer [Line Items]        
Entity-Wide Revenue, Major Customer, Percentage 14.00%   11.00%