Annual report pursuant to Section 13 and 15(d)

Severance and Restructuring Costs - Additional Information (Detail)

v3.19.1
Severance and Restructuring Costs - Additional Information (Detail)
$ in Millions
 12 Months Ended
Jan. 31, 2019
USD ($)
Employee
Jan. 31, 2018
USD ($)
Employee
Restructuring Cost and Reserve [Line Items]    
Restructuring charges for terminated employees $ 1.6 $ 4.2
2019 Restructuring Program [Member]    
Restructuring Cost and Reserve [Line Items]    
Annualized cost savings 6.0  
Severance and restructuring costs 2.0  
2017 Restructuring Program [Member]    
Restructuring Cost and Reserve [Line Items]    
Total restructuring charges incurred   7.2
Former Employees [Member]    
Restructuring Cost and Reserve [Line Items]    
Additional severance charges $ 0.8 $ 0.5
Number of employees terminated | Employee 19 14