Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024
Assets, Current [Abstract]
Cash and cash equivalents	$ 8,887	$ 7,153
Trade accounts receivables, net	126,398	114,477
Inventories	81,199	74,600
Prepaid expenses and other current assets	5,503	6,596
Total current assets	221,987	202,826
Property, Plant and Equipment [Abstract]
PROPERTY, PLANT, AND EQUIPMENT:	396,244	386,648
Less accumulated depreciation	182,604	177,774
Net property, plant, and equipment	213,640	208,874
Other Assets [Abstract]
Right-of-use assets	12,157	11,713
Goodwill	114,046	103,399
Intangible assets, net of accumulated amortization	124,563	116,626
Deferred compensation plan asset	11,365	9,584
Other	4,980	4,912
Total other assets	267,111	246,234
Total assets	702,738	657,934
Liabilities, Current [Abstract]
Accounts payable — trade	47,795	56,387
Accrued payroll and employee benefits	12,501	19,532
Income tax payable	11,751	1,943
Current portion of long-term debt	9,913	9,913
Environmental remediation	7,700	7,700
Other current liabilities	8,332	7,832
Total current liabilities	97,992	103,307
LONG-TERM DEBT, LESS CURRENT PORTION	123,840	88,818
LONG-TERM LEASE LIABILITY	9,816	9,530
PENSION WITHDRAWAL LIABILITY	3,443	3,538
DEFERRED INCOME TAXES	22,367	22,406
DEFERRED COMPENSATION LIABILITY	12,244	11,764
EARNOUT LIABILITY	11,577	11,235
OTHER LONG-TERM LIABILITIES	241	1,310
Total liabilities	281,520	251,908
COMMITMENTS AND CONTINGENCIES
SHAREHOLDERS’ EQUITY:
Common stock; authorized: 60,000,000 shares of $0.01 par value; 20,734,331 and 20,790,261 shares issued and outstanding as of June 30, 2024 and March 31, 2024, respectively	207	208
Additional paid-in capital	27,932	38,154
Retained earnings	390,070	364,549
Accumulated other comprehensive income	3,009	3,115
Total shareholders’ equity	421,218	406,026
Total liabilities and shareholders’ equity	$ 702,738	$ 657,934