Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Apr. 30, 2021	Jan. 31, 2021
Current assets
Cash and cash equivalents	$ 17,764	$ 32,938
Accounts receivable, net	68,064	48,669
Inventories, net	63,407	52,703
Other current assets	7,904	5,776
Total current assets	157,139	140,086
Property, plant and equipment, net	107,905	106,007
Goodwill	109,284	107,677
Intangible assets, net	46,074	44,585
Other assets	10,437	11,016
TOTAL ASSETS	430,839	409,371
Current liabilities
Accounts payable	22,535	18,639
Accrued liabilities	33,836	30,401
Other current liabilities	3,751	2,998
Total current liabilities	60,122	52,038
Long-term debt	2,895	1,981
Other liabilities	23,837	23,997
Liabilities, Total	86,854	78,016
Commitments and contingencies (see Note 11)
Shareholders' equity
Common stock, $1 par value, authorized shares 100,000; issued 67,583 and 67,533, respectively	67,583	67,533
Additional paid-in capital	67,266	66,670
Retained earnings	321,296	311,676
Accumulated other comprehensive loss	(977)	(3,341)
Treasury stock at cost, 31,665 and 31,665 shares, respectively	(111,183)	(111,183)
Total shareholders' equity	343,985	331,355
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 430,839	$ 409,371
Stockholders' Equity, Number of Shares, Par Value and Other Disclosures [Abstract]
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	67,583,000	67,533,000
Treasury Stock, Common, Shares	31,665,000	31,665,000