Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net Earnings	$ 70,894	$ 68,860	$ 256,632
Adjustments to Reconcile Net Earnings to Net Cash Provided by Operating Activities, Net of Effect of Non-Cash Activity:
Depreciation, Depletion and Amortization	113,518	122,535	114,015
Impairment Losses	224,267	220,265
Deferred Income Tax Provision	75,987	(28,371)	(49,354)
Stock Compensation Expense	19,823	15,109	14,079
Equity in Earnings of Unconsolidated Joint Venture	(42,585)	(38,565)	(43,419)
Distributions from Joint Venture	33,500	34,250	31,500
Changes in Operating Assets and Liabilities:
Accounts and Notes Receivable	(25,005)	10,180	(2,560)
Inventories	26,729	(19,016)	(5,114)
Accounts Payable and Accrued Liabilities	17,265	(31,949)	24,173
Other Assets	7,841	(3,284)	4,196
Income Taxes Payable (Receivable)	(122,933)	270	(6,483)
Net Cash Provided by Operating Activities	399,301	350,284	337,665
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to Property, Plant, and Equipment	(132,119)	(168,873)	(131,957)
Acquisition Spending	(699,361)		(36,761)
Proceeds from Sales of Property, Plant, and Equipment	400	2,281
Net Cash Used in Investing Activities	(831,080)	(166,592)	(168,718)
CASH FLOWS FROM FINANCING ACTIVITIES
Increase in Revolving Credit Facility	250,000	70,000	15,000
Repayment of Private Placement Senior Unsecured Notes	(36,500)		(81,214)
Issuance of Term Loan	665,000
Dividends Paid to Stockholders	(17,142)	(18,927)	(19,438)
Purchase and Retirement of Common Stock	(313,887)	(271,988)	(61,078)
Proceeds from Stock Option Exercises	3,298	2,103	24,264
Shares Redeemed to Settle Employee Taxes on Stock Compensation	(4,063)	(4,347)	(4,974)
Payment of Debt Issuance Costs	(4,880)
Net Cash Provided by (Used in) Financing Activities	541,826	(223,159)	(127,440)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	110,047	(39,467)	41,507
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	8,601	48,068	6,561
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 118,648	$ 8,601	$ 48,068

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