Severance and Restructuring Costs - Additional Information (Detail) $ in Millions |
3 Months Ended |
|---|---|
|
Apr. 30, 2019
USD ($)
| |
| Restructuring Cost and Reserve [Line Items] | |
| Restructuring charges for terminated employees | $ 0.1 |
| 2019 Restructuring Program [Member] | |
| Restructuring Cost and Reserve [Line Items] | |
| Severance and restructuring costs | 2.0 |
| 2019 Restructuring Program [Member] | Minimum [Member] | |
| Restructuring Cost and Reserve [Line Items] | |
| Annualized cost savings | $ 6.0 |