Condensed Consolidated Statements of Income (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2013	Aug. 31, 2012
Income Statement [Abstract]
Net Sales	$ 189,782,229	$ 153,385,291	$ 372,956,848	$ 280,528,155
Costs and Expenses
Cost of Sales	133,877,304	110,073,078	266,336,860	199,350,629
Selling, General and Administrative	26,178,490	15,768,242	52,865,428	31,124,459
Interest Expense	4,651,412	3,227,906	9,129,099	6,568,072
Net Loss (Gain) On Sale of Property, Plant and Equipment, and Insurance Proceeds	(859,576)	17,393	(882,917)	(5,951,688)
Other Expense (Income) - net	117,439	(294,530)	(3,710,598)	(246,221)
Total costs and expenses	163,965,069	128,792,089	323,737,872	230,845,251
Income Before Income Taxes	25,817,160	24,593,202	49,218,976	49,682,904
Income Tax Expense	9,454,391	8,720,265	18,309,424	17,824,027
Net Income	$ 16,362,769	$ 15,872,937	$ 30,909,552	$ 31,858,877
Earnings Per Common Share
Basic Earnings Per Share (usd per share)	$ 0.64	$ 0.63	$ 1.21	$ 1.26
Diluted Earnings Per Share (usd per share)	$ 0.64	$ 0.62	$ 1.20	$ 1.25