Property and Equipment, Net - Components of Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Apr. 30, 2020	Jan. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 80,108	$ 80,102
Less accumulated depreciation	(27,222)	(25,350)
Total property and equipment, net	52,886	54,752
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,040	3,040
Building
Property, Plant and Equipment [Line Items]
Property and equipment, gross	20,984	20,984
Land improvements and building improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	22,392	22,392
Equipment and computers
Property, Plant and Equipment [Line Items]
Property and equipment, gross	10,871	11,066
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	12,807	12,849
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	9,369	9,385
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 645	$ 386