Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	12 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Feb. 29, 2012
Cash Flows From Operating Activities:
Net Income	$ 59,597,048	$ 60,456,206	$ 40,735,796
Adjustments To Reconcile Net Income To Net Cash Provided By Operating Activities:
Depreciation	25,090,468	19,364,557	18,854,644
Amortization	18,214,434	9,998,590	3,740,043
Non-cash compensation expense	3,703,407	3,175,050	2,927,917
Non-cash interest expense	1,420,941	286,934	320,209
Provision for doubtful accounts	(115,790)	446,158	360,607
Deferred income tax expense	842,265	3,365,810	2,504,754
Net (gain) loss on insurance settlement or sale of property, plant and equipment	(8,038,747)	(8,302,770)	166,183
Effects of changes in operating assets and liabilities, net of business acquisitions:
Accounts Receivable	35,954,790	(11,599,297)	(11,211,943)
Inventories	(6,208,765)	(4,453,680)	307,481
Prepaid expenses and other assets	(6,590,354)	(2,244,366)	(1,463,003)
Net change in billings related to costs and estimated earnings on uncompleted contracts	(9,732,472)	1,941,978	2,702,342
Accounts payable	(4,149,782)	957,646	2,420,530
Other accrued liabilities and income taxes	(2,712,147)	19,344,797	1,699,268
Net cash provided by operating activities	107,275,296	92,737,613	64,064,828
Cash flows from investing activities:
Proceeds from the sale or insurance settlement of property, plant and equipment	8,204,997	11,838,811	300,859
Acquisition of subsidiaries, net of cash acquired	(275,702,030)	(137,057,680)	(27,362,834)
Purchases of property, plant and equipment	(43,471,526)	(24,922,987)	(19,783,755)
Net cash used in investing activities	(310,968,559)	(150,141,856)	(46,845,730)
Cash flows from financing activities:
Debt origination costs	(5,880,539)	(100,000)	0
Tax benefits from stock options exercised	1,601,991	1,283,240	199,427
Proceeds from exercise of stock options and stock appreciation rights	0	15,781	48
Proceeds from revolving loan	197,000,000	0	0
Payments on revolving loan	(60,000,000)	0	0
Proceeds from long-term debt	75,000,000	0	0
Payments on long-term debt	(17,098,214)	(18,135,866)	0
Cash dividends paid	(14,290,437)	(13,423,199)	(12,565,821)
Net cash provided by (used in) financing activities	176,332,801	(30,360,044)	(12,366,346)
Effect of exchange rate changes on cash	(672,756)	59,372	60,077
Net increase (decrease) in cash and cash equivalents	(28,033,218)	(87,704,915)	4,912,829
Cash and cash equivalents at beginning of year	55,597,751	143,302,666	138,389,837
Cash and cash equivalents at end of year	27,564,533	55,597,751	143,302,666
Cash paid during the year for:
Interest	16,500,298	13,107,744	13,569,583
Income taxes	$ 26,331,750	$ 30,967,378	$ 21,627,112