Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Additional Information (Detail)

v3.19.1
Employee Benefit Plans - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Retirement Savings Plan [Member]    
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Defined contribution plan, cost recognized $ 0.5 $ 1.1