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Consolidated Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES    
Net Earnings $ 118,244 $ 105,581
Adjustments to Reconcile Net Earnings to Net Cash Provided by Operating Activities -    
Depreciation, Depletion and Amortization 59,253 45,249
Inventory Adjustment to Net Realizable Value   8,492
Deferred Income Tax Provision 1,077 2,125
Stock Compensation Expense 7,235 6,158
Excess Tax Benefits from Share Based Payment Arrangements   (5,494)
Equity in Earnings of Unconsolidated Joint Venture (21,831) (20,127)
Distributions from Joint Venture 17,500 21,750
Changes in Operating Assets and Liabilities:    
Accounts and Notes Receivable (30,361) (33,506)
Inventories 13,856 17,521
Accounts Payable and Accrued Liabilities (14,905) 3,337
Other Assets 2,202 (1,005)
Income Taxes Payable 478 10,071
Net Cash Provided by Operating Activities 152,748 160,152
CASH FLOWS FROM INVESTING ACTIVITIES    
Property, Plant and Equipment Additions (44,851) (18,231)
Acquisition Spending (36,761)  
Net Cash Used in Investing Activities (81,612) (18,231)
CASH FLOWS FROM FINANCING ACTIVITIES    
Decrease in Credit Facility (30,000) (382,000)
Issuance of Long-term Debt   350,000
Payment of Debt Issuance Costs   (6,637)
Dividends Paid to Stockholders (9,709) (9,677)
Shares Redeemed to Settle Employee Taxes on Stock Compensation (2,455) (2,965)
Purchase and Retirement of Common Stock (24,903) (60,013)
Proceeds from Stock Option Exercises 20,426 12,992
Excess Tax Benefits from Share Based Payment Arrangements   5,494
Net Cash Used in Financing Activities (46,641) (92,806)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 24,495 49,115
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD 6,561 5,391
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 31,056 $ 54,506