Summary of Business and Significant Accounting Policies - Schedule of Property and Equipment Estimated Useful Lives (Detail)	6 Months Ended
	Jul. 31, 2020
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	5 years
Minimum | Computers, equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	3 years
Minimum | Buildings and building improvements
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	10 years
Maximum | Computers, equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	9 years
Maximum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	10 years
Maximum | Buildings and building improvements
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	40 years