Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2018	Aug. 31, 2017
Income Statement [Abstract]
Net sales	$ 222,787	$ 196,329	$ 485,023	$ 401,612
Costs and Expenses
Cost of sales	175,883	152,529	379,414	310,430
Gross margin	46,904	43,800	105,609	91,182
Selling, general and administrative	29,799	26,413	64,808	53,772
Operating income	17,105	17,387	40,801	37,410
Interest expense	3,980	3,400	7,818	6,760
Other (income) expense, net	(857)	260	(1,148)	75
Income before income taxes	13,982	13,727	34,131	30,575
Income tax expense	2,738	3,941	7,169	8,727
Net income	$ 11,244	$ 9,786	$ 26,962	$ 21,848
Earnings Per Common Share
Basic Earnings Per Share (usd per share)	$ 0.43	$ 0.38	$ 1.04	$ 0.84
Diluted Earnings Per Share (usd per share)	0.43	0.38	1.03	0.84
Common Stock, Dividends, Per Share, Declared	$ 0.17	$ 0.17	$ 0.34	$ 0.34