Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
Nov. 30, 2014	Nov. 30, 2013
Cash Flows From Operating Activities:
Net Income	$ 48,659,422us-gaap_NetIncomeLoss	$ 49,354,707us-gaap_NetIncomeLoss
Adjustments To Reconcile Net Income To Net Cash Provided By Operating Activities:
Provision For Doubtful Accounts	311,491us-gaap_ProvisionForDoubtfulAccounts	(28,980)us-gaap_ProvisionForDoubtfulAccounts
Amortization and Depreciation	35,111,985us-gaap_DepreciationAndAmortization	31,985,669us-gaap_DepreciationAndAmortization
Deferred Income Tax Expense	3,628,040us-gaap_DeferredIncomeTaxExpenseBenefit	2,962,278us-gaap_DeferredIncomeTaxExpenseBenefit
Property, Plant and Equipment, Disposals	2,651,182us-gaap_GainLossOnDispositionOfAssets1
Net Loss (Gain) On Insurance Settlement or On Sale of Property, Plant & Equipment	(1,194,944)	(8,255,844)
Amortization of Deferred Borrowing Costs	1,078,285us-gaap_AmortizationOfFinancingCosts	1,042,945us-gaap_AmortizationOfFinancingCosts
Share Based Compensation Expense	3,342,071us-gaap_ShareBasedCompensation	2,988,596us-gaap_ShareBasedCompensation
Effects of Changes In Assets & Liabilities:
Accounts Receivable	(15,482,965)	30,308,868
Inventories	(4,715,190)us-gaap_IncreaseDecreaseInInventories	(4,328,441)us-gaap_IncreaseDecreaseInInventories
Prepaid Expenses and Other	3,596,377	(404,189)
Other Assets	(161,370)	(4,157,077)
Net Change In Billings Related To Costs and Estimated Earnings On Uncompleted Contracts	(7,874,605)	(4,022,948)
Accounts Payable	19,875,079	(2,053,323)
Other Accrued Liabilities and Income Taxes Payable	(5,896,790)	(777,868)
Net Cash Provided By Operating Activities	82,928,068	94,614,393
Cash Flows Used For Investing Activities:
Proceeds From Sale Or Insurance Settlement of Property, Plant, and Equipment	1,320,999	910,180
Purchase of Property, Plant and Equipment	(19,858,893)	(34,948,472)
Acquisition of Subsidiaries, Net of Cash Acquired	(10,500,000)	(275,702,030)
Net Cash From Investing Activities	(29,037,894)	(309,740,322)
Cash Flows From Financing Activities:
Excess Tax Benefits From Stock Options and Stock Appreciation Rights	213,708	1,216,428
Proceeds from Revolving Loan	10,977,095us-gaap_ProceedsFromLinesOfCredit	197,000,000us-gaap_ProceedsFromLinesOfCredit
Payments on Revolving Loan	(19,000,000)us-gaap_RepaymentsOfLinesOfCredit	(30,000,000)us-gaap_RepaymentsOfLinesOfCredit
Proceeds on Long Term Debt	0	75,000,000
Payments on Long Term Debt	(18,973,213)us-gaap_RepaymentsOfLongTermDebt	(16,160,714)us-gaap_RepaymentsOfLongTermDebt
Debt Acquisition Costs		(5,880,539)us-gaap_PaymentsOfDebtIssuanceCosts
Payments of Dividends	(11,038,063)us-gaap_PaymentsOfDividends	(10,709,629)us-gaap_PaymentsOfDividends
Net Cash Used In Financing Activities	(37,820,473)	210,465,546
Effect of Exchange Rate Changes on Cash	316,519	9,881
Net Increase (Decrease) In Cash & Cash Equivalents	16,386,220	(4,650,502)
Cash & Cash Equivalents At Beginning of Period	27,564,533	55,597,751
Cash & Cash Equivalents At End of Period	43,950,753	50,947,249
Supplemental Disclosures
Cash Paid For Interest	11,044,378us-gaap_InterestPaid	11,667,987us-gaap_InterestPaid
Cash Paid For Income Taxes	$ 15,263,883us-gaap_IncomeTaxesPaid	$ 20,537,607us-gaap_IncomeTaxesPaid

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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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.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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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.

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