Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net Earnings	$ 113,097	$ 138,942
Adjustments to Reconcile Net Earnings to Net Cash Provided by Operating Activities, Net of Effect of Non-Cash Activity -
Depreciation, Depletion, and Amortization	56,333	62,176
Deferred Income Tax Provision	7,520	10,851
Stock Compensation Expense	12,137	7,559
Equity in Earnings of Unconsolidated Joint Venture	(21,789)	(19,424)
Distributions from Joint Venture	15,000	19,500
Changes in Operating Assets and Liabilities:
Accounts and Notes Receivable	(51,242)	(35,894)
Inventories	35,562	19,290
Accounts Payable and Accrued Liabilities	423	(24,399)
Other Assets	9,244	(3,551)
Income Taxes Payable (Receivable)	8,411	(174)
Net Cash Provided by Operating Activities	184,696	174,876
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to Property, Plant, and Equipment	(60,007)	(93,444)
Acquisition Spending	(30,872)
Proceeds from Sale of Property, Plant, and Equipment		2,281
Net Cash Used in Investing Activities	(90,879)	(91,163)
CASH FLOWS FROM FINANCING ACTIVITIES
Increase in Credit Facility	275,000	10,000
Dividends Paid to Stockholders	(8,815)	(9,582)
Purchase and Retirement of Common Stock	(313,887)	(122,404)
Proceeds from Stock Option Exercises	1,767	1,992
Shares Redeemed to Settle Employee Taxes on Stock Compensation	(2,799)	(1,785)
Net Cash Used in Financing Activities	(48,734)	(121,779)
NET INCREASE IN CASH AND CASH EQUIVALENTS	45,083	(38,066)
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF PERIOD	8,601	48,068
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 53,684	$ 10,002