Summary of Business and Significant Accounting Policies - Schedule of Estimated Useful Lives by Asset Classification (Detail)	12 Months Ended
	Jan. 31, 2020
Building
Property, Plant and Equipment [Line Items]
Estimated useful life	30 years
Land and building improvements
Property, Plant and Equipment [Line Items]
Estimated useful life description	10 years (land improvements) and estimated useful life of building (building improvements)
Equipment and computers
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated useful life description	Shorter of remaining life of the lease term or estimated useful life