Annual report pursuant to Section 13 and 15(d)

Nature of Business and Basis of Presentation - Additional Information (Detail)

v3.20.1
Nature of Business and Basis of Presentation - Additional Information (Detail)
$ in Millions
12 Months Ended
Jan. 31, 2019
USD ($)
Restructuring Plan [Member]  
Significant Accounting Policies [Line Items]  
Annualized cost savings $ 6