Quarterly report pursuant to Section 13 or 15(d)

Nature of Business and Basis of Presentation - Schedule of Effect of Change in Methodology (Detail)

v3.7.0.1
Nature of Business and Basis of Presentation - Schedule of Effect of Change in Methodology (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2017
Jul. 31, 2016
Nature Of Business And Basis Of Presentation [Line Items]        
Cost of revenues - service $ 4,218 $ 8,920 $ 10,198 $ 18,866
Selling and marketing expenses $ 2,439 4,429 $ 5,376 8,499
As Filed Fiscal 2017 [Member]        
Nature Of Business And Basis Of Presentation [Line Items]        
Cost of revenues - service   9,487   19,946
Selling and marketing expenses   3,862   7,419
Adjustment to Conform to Current Year Presentation [Member]        
Nature Of Business And Basis Of Presentation [Line Items]        
Cost of revenues - service   (567)   (1,080)
Selling and marketing expenses   $ 567   $ 1,080