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 | |
| X | ||||||||||
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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