Condensed Consolidated Statements of Income (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2014	Aug. 31, 2013
Income Statement [Abstract]
Net Sales	$ 193,415,643	$ 189,782,229	$ 409,542,035	$ 372,956,848
Costs and Expenses
Cost of Sales	151,315,672	133,877,304	312,053,326	266,336,860
Gross Profit	42,099,971	55,904,925	97,488,709	106,619,988
Selling, General and Administrative	19,143,533	26,178,490	46,684,819	52,865,428
Operating Income (Loss)	22,956,438	29,726,435	50,803,890	53,754,560
Interest Expense	4,223,791	4,651,412	8,432,336	9,129,099
Gain (Loss) on Disposition of Property Plant Equipment	(3,062)	859,576	23,501	882,917
Other Expense (Income) - net	17,388	117,439	(13,661)	(3,710,598)
Income Before Income Taxes	18,712,197	25,817,160	42,408,716	49,218,976
Income Tax Expense	4,943,487	9,454,391	13,714,615	18,309,424
Net Income	$ 13,768,710	$ 16,362,769	$ 28,694,101	$ 30,909,552
Earnings Per Common Share
Basic Earnings Per Share (usd per share)	$ 0.54	$ 0.64	$ 1.12	$ 1.21
Diluted Earnings Per Share (usd per share)	$ 0.53	$ 0.64	$ 1.11	$ 1.20