Goodwill and Intangible Assets - Schedule of Finite-Life Intangible Assets, Future Amortization Expense (Detail) - USD ($) $ in Thousands |
Apr. 30, 2017 |
Jan. 31, 2017 |
|---|---|---|
| Goodwill and Intangible Assets Disclosure [Abstract] | ||
| 2018 (for the remaining nine months) | $ 1,204 | |
| 2019 | 837 | |
| 2020 | 236 | |
| 2021 | 5 | |
| 2022 | 0 | |
| 2023 and thereafter | 0 | |
| Finite-life intangible assets, Net | $ 2,282 | $ 2,603 |