Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 30, 2015	Nov. 30, 2014	Nov. 30, 2015	Nov. 30, 2014
Income Statement [Abstract]
Net Sales	$ 242,447	$ 224,833	$ 685,581	$ 634,376
Costs and Expenses
Cost of Sales	179,999	164,058	510,324	476,112
Gross Profit	62,448	60,775	175,257	158,264
Selling, General and Administrative	26,040	27,847	79,545	74,532
Operating Income (Loss)	36,408	32,928	95,712	83,732
Interest Expense	3,743	4,099	11,612	12,531
Gain (Loss) on Disposition of Property Plant Equipment	16	1,171	465	1,195
Other Expense (Income) - net	(27)	1,322	828	1,309
Income Before Income Taxes	32,708	28,678	83,737	71,087
Income Tax Expense	9,161	8,713	23,023	22,428
Net Income	$ 23,547	$ 19,965	$ 60,714	$ 48,659
Earnings Per Common Share
Basic Earnings Per Share (usd per share)	$ 0.91	$ 0.78	$ 2.35	$ 1.90
Diluted Earnings Per Share (usd per share)	$ 0.91	$ 0.77	$ 2.34	$ 1.89