Condensed Consolidated Statements of Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2013	Nov. 30, 2012
Income Statement [Abstract]
Net Sales	$ 197,755,332	$ 149,674,616	$ 570,712,180	$ 430,202,771
Costs and Expenses
Cost of Sales	144,394,673	104,671,793	410,731,533	304,022,422
Selling, General and Administrative	28,112,999	17,894,549	80,978,427	49,019,008
Interest Expense	4,614,787	3,234,340	13,743,886	9,802,412
Net Loss (Gain) On Sale of Property, Plant and Equipment, and Insurance Proceeds	(7,372,927)	157,065	(8,255,844)	(5,794,623)
Other Expense (Income) - net	93,802	(453,853)	(3,616,796)	(700,074)
Total costs and expenses	169,843,334	125,503,894	493,581,206	356,349,145
Income Before Income Taxes	27,911,998	24,170,722	77,130,974	73,853,626
Income Tax Expense	9,466,843	8,807,042	27,776,267	26,631,069
Net Income	$ 18,445,155	$ 15,363,680	$ 49,354,707	$ 47,222,557
Earnings Per Common Share
Basic Earnings Per Share (usd per share)	$ 0.72	$ 0.61	$ 1.94	$ 1.87
Diluted Earnings Per Share (usd per share)	$ 0.72	$ 0.60	$ 1.92	$ 1.85