Nature of Business and Basis of Presentation - Additional Information (Detail) $ in Millions |
6 Months Ended |
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Jul. 31, 2019
USD ($)
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| Restructuring Plan [Member] | |
| Significant Accounting Policies [Line Items] | |
| Annualized cost savings | $ 6 |
| X | ||||||||||
- Definition Significant Accounting Policies [Line Items] No definition available.
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| X | ||||||||||
- Definition The quantified amount of the future effect on earnings. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Details
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