Condensed Consolidated Statements of Income (Unaudited) (USD $)	12 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Feb. 29, 2012
Income Statement [Abstract]
Net Sales	$ 751,723,398	$ 570,594,238	$ 469,112,410
Costs and Expenses
Cost of Sales	546,018,393	406,421,677	344,525,516
Selling, General and Administrative	105,591,214	66,188,575	48,864,886
Interest Expense	18,406,658	13,072,605	13,939,149
Net Loss (Gain) On Sale of Property, Plant and Equipment, and Insurance Proceeds	(8,038,747)	(8,302,770)	166,183
Other Expense (Income) - net	(4,165,374)	(1,154,682)	(2,024,229)
Total costs and expenses	657,812,144	476,225,405	405,471,505
Income before income taxes	93,911,254	94,368,833	63,640,905
Income Tax Expense	34,314,206	33,912,627	22,905,109
Net Income	$ 59,597,048	$ 60,456,206	$ 40,735,796
Earnings Per Common Share
Basic Earnings Per Share (usd per share)	$ 2.34	$ 2.39	$ 1.62
Diluted Earnings Per Share (usd per share)	$ 2.32	$ 2.37	$ 1.61
Weighted average number common shares (shares)	25,514,387	25,320,147	25,131,754
Weighted average number common shares and potentially dilutive common shares (shares)	25,693,468	25,560,594	25,362,120