Condensed Consolidated Statements of Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
	Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2014	Nov. 30, 2013
Income Statement [Abstract]
Net Sales	$ 224,833,465	$ 197,755,332	$ 634,375,500	$ 570,712,180
Costs and Expenses
Cost of Sales	164,058,332	144,394,673	476,111,658	410,731,533
Gross Profit	60,775,133	53,360,659	158,263,842	159,980,647
Selling, General and Administrative	27,847,356	28,112,999	74,532,175	80,978,427
Operating Income (Loss)	32,927,777	25,247,660	83,731,667	79,002,220
Interest Expense	4,099,062	4,614,787	12,531,398	13,743,886
Gain (Loss) on Disposition of Property Plant Equipment	1,171,443	7,372,927	1,194,944	8,255,844
Other Expense (Income) - net	1,321,782	93,802	1,308,121	(3,616,796)
Income Before Income Taxes	28,678,376	27,911,998	71,087,092	77,130,974
Income Tax Expense	8,713,055	9,466,843	22,427,670	27,776,267
Net Income	$ 19,965,321	$ 18,445,155	$ 48,659,422	$ 49,354,707
Earnings Per Common Share
Basic Earnings Per Share (usd per share)	$ 0.78	$ 0.72	$ 1.90	$ 1.94
Diluted Earnings Per Share (usd per share)	$ 0.77	$ 0.72	$ 1.89	$ 1.92