Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net Earnings	$ 374,247	$ 339,444	$ 70,894
Adjustments to Reconcile Net Earnings to Net Cash Provided by Operating Activities, Net of Effect of Non-Cash Activity:
Depreciation, Depletion, and Amortization	128,811	129,087	113,518
Write-off of debt issuance costs	6,101
Impairment Losses			224,267
Deferred Income Tax Provision	6,383	59,319	75,987
Stock Compensation Expense	14,264	15,293	19,823
Gain on Sale of Businesses		(61,203)
Equity in Earnings of Unconsolidated Joint Venture	(32,488)	(37,441)	(42,585)
Distributions from Joint Venture	27,250	36,000	33,500
Changes in Operating Assets and Liabilities:
Accounts and Notes Receivable	(29,209)	2,127	(25,005)
Inventories	(912)	30,002	26,729
Accounts Payable and Accrued Liabilities	27,192	9,541	17,265
Other Assets	(1,331)	(6,455)	7,841
Income Taxes Receivable	(3,137)	127,359	(122,933)
Net Cash Provided by Operating Activities	517,171	643,073	399,301
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to Property, Plant, and Equipment	(74,121)	(53,933)	(132,119)
Acquisition Spending			(699,361)
Proceeds from Sale of Businesses		91,022
Proceeds from Sales of Property, Plant, and Equipment			400
Net Cash Provided by (Used in) Investing Activities	(74,121)	37,089	(831,080)
CASH FLOWS FROM FINANCING ACTIVITIES
(Decrease) Increase in Revolving Credit Facility	200,000	(560,000)	250,000
Issuance (Repayment) of Term Loan	(665,000)		665,000
Repayment of Senior Unsecured Notes			(36,500)
Dividends Paid to Stockholders	(30,770)	(4,163)	(17,142)
Purchase and Retirement of Common Stock	(589,742)		(313,887)
Proceeds from Stock Option Exercises	21,366	40,455	3,298
Premium Paid on Early Retirement of Senior Notes	(8,407)
Payment of Debt Issuance Costs	(7,985)	(2,396)	(4,880)
Shares Redeemed to Settle Employee Taxes on Stock Compensation	(5,308)	(4,186)	(4,063)
Net Cash (Used in) Provided by Financing Activities	(692,154)	(530,290)	541,826
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	(249,104)	149,872	110,047
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT BEGINNING OF PERIOD	268,520	118,648	8,601
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT END OF PERIOD	19,416	$ 268,520	$ 118,648
2.500% Senior Unsecured Notes [Member]
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from 2.500% Senior Unsecured Notes	743,692
4.500% Senior Unsecured Notes [Member]
CASH FLOWS FROM FINANCING ACTIVITIES
Repayment of Senior Unsecured Notes	$ (350,000)