Condensed Consolidated Statements Of Cash Flows (USD $)	9 Months Ended
	Nov. 30, 2011	Nov. 30, 2010
Cash Flows From Operating Activities:
Net Income	$ 29,092,140	$ 25,737,786
Adjustments to Reconcile Net Income to Net Cash From Operating Activities:
Provision for Doubtful Accounts	129,338	102,146
Amortization and Depreciation	16,869,925	16,163,780
Deferred Income Tax Expense	3,491,732	(574,701)
Net Loss (Gain) on Sale or Insurance Settlement of Property, Plant & Equipment	163,777	(50,613)
Amortization of Deferred Borrowing Costs	241,006	245,712
Share-Based Compensation Expense	2,696,083	2,801,435
Effects of Changes In Assets & Liabilities:
Accounts Receivable	(3,693,162)	(5,241,586)
Inventories	(5,273,206)	(7,764,627)
Prepaid Expenses And Other	(1,153,152)	(646,750)
Other Assets	(3,808)	(113,604)
Net Change In Billings Related to Costs and Estimated Earnings on Uncompleted Contracts	2,176,709	(4,449,069)
Accounts Payable	2,604,300	2,749,274
Other Accrued Liabilities and Income Taxes	(510,062)	(3,430,660)
Net Cash Provided By Operating Activities	46,831,620	25,528,523
Cash Flows From Investing Activities:
Proceeds From Sale or Insurance Settlement of Property, Plant, and Equipment	273,521	195,617
Purchase of Property, Plant and Equipment	(16,344,083)	(10,986,924)
Acquisition of Subsidiaries, Net of Cash Acquired		(104,091,416)
Net Cash Used In Investing Activities	(16,070,562)	(114,882,723)
Cash Flows From Financing Activities:
Proceeds From Exercise of Stock Options	48	379,955
Excess Tax Benefits From Stock Options and Stock Appreciation Rights	199,427	875,224
Proceeds from Revolving Loan		12,000,000
Payments on Revolving Loan		(12,000,000)
Payments on Long Term Debt		(7,300,000)
Proceeds From Settlement of Financial Derivative		834,416
Dividends Paid	(9,420,167)	(9,341,973)
Net Cash Used In Financing Activities	(9,220,692)	(14,552,378)
Effect Of Exchange Rate Changes on Cash	168,350	(47,478)
Net Increase (Decrease) In Cash & Cash Equivalents	21,708,716	(103,954,056)
Cash & Cash Equivalents at Beginning of Period	138,389,837	110,607,029
Cash & Cash Equivalents at End of Period	160,098,553	6,652,973
Supplemental Disclosures
Cash Paid For Interest	10,041,387	6,560,693
Cash Paid For Income Taxes	$ 16,636,076	$ 14,098,568