Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Schedule of Effect of Change in Methodology (Detail)

v3.8.0.1
Summary of Significant Accounting Policies - Schedule of Effect of Change in Methodology (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2016
Significant Accounting Policies [Line Items]      
Cost of revenues - service $ 22,001 $ 35,740 $ 44,159
Selling and marketing expenses $ 12,614 16,158 $ 15,197
As Filed Fiscal 2017 [Member]      
Significant Accounting Policies [Line Items]      
Cost of revenues - service   37,865  
Selling and marketing expenses   14,033  
Adjustment to Conform to Current Year Presentation [Member]      
Significant Accounting Policies [Line Items]      
Cost of revenues - service   (2,125)  
Selling and marketing expenses   $ 2,125