Property and Equipment, Net - Components of Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Apr. 30, 2018	Jan. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 65,382	$ 65,121
Less accumulated depreciation	(13,882)	(12,837)
Total property and equipment, net	51,500	52,284	[1]
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,040	3,040
Building [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	20,984	20,984
Land improvements and building improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	20,166	20,073
Equipment and computers [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	7,912	7,732
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	9,560	9,619
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,705	3,637
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 15	$ 36

[1] See note 1 of the notes to the condensed consolidated financial statements for a summary of adjustments.