Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets - Schedule of Change in Carrying Amount of Goodwill (Detail)

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Goodwill and Intangible Assets - Schedule of Change in Carrying Amount of Goodwill (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jul. 31, 2018
Jan. 31, 2018
Goodwill Roll Forward    
Goodwill, gross $ 64,858 $ 62,566
Accumulated impairment losses (39,279) (39,279)
Goodwill, net 25,579 23,287
Cumulative translation adjustment (970) 2,292
Goodwill, gross 63,888 64,858
Accumulated impairment losses (39,279) (39,279)
Goodwill, net $ 24,609 $ 25,579