Nature of Business and Basis of Presentation - Additional Information (Detail) - USD ($) $ in Millions |
9 Months Ended | |
|---|---|---|
Oct. 31, 2019 |
Oct. 31, 2018 |
|
| Restructuring Plan [Member] | ||
| Significant Accounting Policies [Line Items] | ||
| Annualized cost savings | $ 6 | $ 6 |
| X | ||||||||||
- Definition Significant Accounting Policies [Line Items] No definition available.
|
| X | ||||||||||
- Definition The quantified amount of the future effect on earnings. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|