Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Jan. 31, 2019	Jan. 31, 2018
Property, Plant and Equipment [Abstract]
Land and Land Improvements	$ 967	$ 967
Buildings and Leasehold Improvements	12,165	12,056
Machinery and Equipment	22,810	22,125
Computer Equipment and Software	9,385	7,729
Gross Property, Plant and Equipment	45,327	42,877
Accumulated Depreciation	(34,947)	(33,125)
Net Property Plant and Equipment	$ 10,380	$ 9,752