Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Jul. 31, 2025	Jan. 31, 2025	Jul. 31, 2024
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 179,682	$ 177,096	$ 173,134
Less accumulated depreciation and amortization	(143,562)	(140,668)	(138,154)
Property, plant, and equipment, net	36,120	36,428	34,980
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,731	3,731	3,731
Land improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	706	706	697
Buildings and building improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	52,050	52,030	51,899
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	122,538	119,972	116,284
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 657	$ 657	$ 523