Quarterly report pursuant to Section 13 or 15(d)

Segment Information, Significant Customers and Geographic Information - Additional Information (Detail)

v3.7.0.1
Segment Information, Significant Customers and Geographic Information - Additional Information (Detail)
3 Months Ended
Apr. 30, 2017
Segment
Customer
Apr. 30, 2016
Segment Reporting Information [Line Items]    
Number of reportable segment | Segment 1  
Total Revenues [Member]    
Segment Reporting Information [Line Items]    
Number of customers accounted | Customer 1  
Total Revenues [Member] | Customer Concentration Risk [Member]    
Segment Reporting Information [Line Items]    
Concentration risk percentage 28.00% 32.00%