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Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net Earnings	$ 66,339	$ 54,882	$ 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	29,850	28,947
Deferred Income Tax Provision	6,173	(3,812)
Stock Compensation Expense	3,493	3,399
Equity in Earnings of Unconsolidated Joint Venture	(9,251)	(9,876)
Distributions from Joint Venture	9,500	4,750
Changes in Operating Assets and Liabilities:
Accounts and Notes Receivable	(45,549)	(38,527)
Inventories	17,159	7,960
Accounts Payable and Accrued Liabilities	8,897	(16,062)
Other Assets	(3,137)	(3,720)
Income Taxes Payable (Receivable)	(1,565)	25,729
Net Cash Provided by Operating Activities	81,909	53,670
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to Property, Plant, and Equipment	(53,073)	(16,160)
Proceeds from Sale of Property, Plant, and Equipment	2,281
Net Cash Used in Investing Activities	(50,792)	(16,160)
CASH FLOWS FROM FINANCING ACTIVITIES
Increase (Decrease) in Credit Facility	30,000	(25,000)
Dividends Paid to Stockholders	(4,790)	(4,853)
Purchase and Retirement of Common Stock	(52,344)	(1,880)
Proceeds from Stock Option Exercises	1,992	1,273
Shares Redeemed to Settle Employee Taxes on Stock Compensation	(956)	(1,378)
Net Cash Used in Financing Activities	(26,098)	(31,838)
NET INCREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH	5,019	5,672
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF PERIOD	48,068	6,561	6,561
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD	$ 53,087	$ 12,233	$ 48,068

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

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- Definition

Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=SL79508275-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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