Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Oct. 31, 2018 |
Jul. 31, 2018 |
Oct. 31, 2017 |
Oct. 31, 2018 |
Oct. 31, 2017 |
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| Goodwill and Intangible Assets Disclosure [Abstract] | |||||
| Percentage of estimated fair value of reporting unit exceeded its carrying value, including goodwill | 28.70% | ||||
| Impairment charge | $ 0 | ||||
| Other long-lived assets | $ 0 | ||||
| Amortization of intangible assets | $ 400,000 | $ 600,000 | $ 1,200,000 | $ 1,800,000 | |
| X | ||||||||||
- Definition Amortization expense charged to cost of product revenue and operating expense. No definition available.
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| X | ||||||||||
- References No definition available.
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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://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Percentage of fair value of reporting unit in excess of carrying amount. No definition available.
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