Quarterly report pursuant to Section 13 or 15(d)

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

v3.10.0.1
Segment Information, Significant Customers and Geographic Information - Schedule of Revenue by Major Customers by Reporting Segments (Detail)
3 Months Ended 6 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2018
Jul. 31, 2017
Customer A [Member] | Customer Concentration Risk [Member] | Total Revenues [Member]        
Entity Wide Revenue Major Customer [Line Items]        
% of total revenues 19.00% 26.00% 19.00% 25.00%