Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net Earnings	$ 461,540	$ 374,247	$ 339,444
Adjustments to Reconcile Net Earnings to Net Cash Provided by Operating Activities, Net of Effect of Noncash Activity:
Depreciation, Depletion, and Amortization	138,554	128,811	129,087
Write-off of debt issuance costs	0	6,101	0
Deferred Income Tax Provision	4,475	6,383	59,319
Stock Compensation Expense	17,155	14,264	15,293
Gain on Sale of Businesses	0	0	(61,203)
Equity in Earnings of Unconsolidated Joint Venture	(35,474)	(32,488)	(37,441)
Distributions from Joint Venture	27,000	27,250	36,000
Changes in Operating Assets and Liabilities:
Accounts and Notes Receivable	(12,035)	(29,209)	2,127
Inventories	(47,946)	(912)	30,002
Accounts Payable and Accrued Liabilities	(7,797)	27,192	9,541
Other Assets	4,955	(1,331)	(6,455)
Income Taxes Receivable	(8,701)	(3,137)	127,359
Net Cash Provided by Operating Activities	541,726	517,171	643,073
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to Property, Plant, and Equipment	(110,143)	(74,121)	(53,933)
Acquisition Spending	(158,451)	0	0
Proceeds from Sale of Businesses	0	0	91,022
Net Cash Provided by (Used in) Investing Activities	(268,594)	(74,121)	37,089
CASH FLOWS FROM FINANCING ACTIVITIES
Borrowings Under Revolving Credit Facility	200,000	200,000	0
Repayment of Borrowings Under Revolving Credit Facility	(43,000)	0	(560,000)
Proceeds from 2.500% Senior Unsecured Notes	0	743,692	0
Repayment of 4.500% Senior Unsecured Notes	0	(350,000)	0
Repayment of Term Loan	(7,500)	(665,000)	0
Dividends Paid to Stockholders	(37,496)	(30,770)	(4,163)
Purchase and Retirement of Common Stock	(387,717)	(589,742)	0
Proceeds from Stock Option Exercises	5,418	21,366	40,455
Premium Paid on Early Retirement of Senior Notes	0	(8,407)	0
Payment of Debt Issuance Costs	(903)	(7,985)	(2,396)
Shares Redeemed to Settle Employee Taxes on Stock Compensation	(6,108)	(5,308)	(4,186)
Net Cash Used in Financing Activities	(277,306)	(692,154)	(530,290)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(4,174)	(249,104)	149,872
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	19,416	268,520	118,648
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 15,242	$ 19,416	$ 268,520