Annual report pursuant to Section 13 and 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 ($)
3 Months Ended 12 Months Ended
Oct. 31, 2017
Jan. 31, 2018
Jan. 31, 2017
Goodwill Roll Forward      
Goodwill, gross   $ 62,566,000 $ 55,962,000
Accumulated impairment losses   (39,279,000) (15,787,000)
Goodwill, net   23,287,000 40,175,000
Acquisition of DCC Labs     7,255,000
Goodwill impairment charge $ 0 0 (23,492,000)
Cumulative translation adjustment   2,292,000 (651,000)
Goodwill, gross   64,858,000 62,566,000
Accumulated impairment losses   (39,279,000) (39,279,000)
Goodwill, net   $ 25,579,000 $ 23,287,000