Selected Balance Sheet Information - USD ($) $ in Thousands	Jul. 31, 2021	Jan. 31, 2021
Accounts receivable, net:
Accounts receivable, net	$ 70,591	$ 48,669
Inventories, net:
Finished goods	12,788	7,684
In process	1,849	759
Materials	61,055	44,260
Inventories, net	75,692	52,703
Other current assets:
Income tax receivable	701	1,440
Prepaid Expense and other	7,849	4,336
Other Assets, Current	8,550	5,776
Property, plant and equipment, net:
Land	3,117	3,117
Buildings and Improvements	87,444	84,651
Machinery and Equipment	176,381	169,252
Financing Lease Right-of-Use Asset	1,561	1,282
Property, Plant and Equipment, Gross, Total	268,503	258,302
Accumulated depreciation	(159,620)	(152,295)
Property, Plant and Equipment, Net, Total	108,883	106,007
Other Assets (Noncurrent):
Equity investments	1,835	1,595
Operating Lease, Right-of-Use Asset	5,816	6,850
Deferred Income Taxes	2,038	360
Other	1,706	2,211
Other assets	11,395	11,016
Accrued liabilities:
Salaries and related	6,953	4,881
Benefits	6,597	6,255
Insurance obligations	1,700	1,896
Warranties	3,085	2,068
Income Taxes	1,370	238
Other taxes	1,996	2,386
Acquisition-related contingent consideration liability, current	2,000	2,000
Lease liability, current	1,916	2,482
Other	13,556	8,195
Accrued Liabilities	39,173	30,401
Other liabilities:
Postretirement benefits	9,012	8,996
Lease liability, noncurrent	4,898	5,426
Deferred Income Tax Liabilities, Net	1,345	2,091
Uncertain tax positions	2,823	2,692
Other, Noncurrent	4,932	4,792
Other Liabilities, Noncurrent	23,010	23,997
Allowance for uncollectable Account Receivable[Member]
Accounts receivable, net:
Trade accounts	71,413	47,879
Unbilled receivables	1,084	2,734
Allowance for doubtful accounts	(1,906)	(1,944)
Accounts receivable, net	$ 70,591	$ 48,669