CONSOLIDATED STATEMENTS OF EARNINGS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2013	Aug. 31, 2012
Income Statement [Abstract]
Net sales	$ 135,288	$ 138,344	$ 273,754	$ 280,872
Cost of goods sold	98,629	104,395	201,300	218,674
Gross profit margin	36,659	33,949	72,454	62,198
Selling, general and administrative	21,083	21,331	43,288	43,357
Gain from disposal of assets	(248)	(5)	(255)	(9)
Income from operations	15,824	12,623	29,421	18,850
Other income (expense)
Interest expense	(216)	(402)	(467)	(871)
Other, net	(53)	(265)	104	85
Total other expense	(269)	(667)	(363)	(786)
Earnings before income taxes	15,555	11,956	29,058	18,064
Provision for income taxes	5,754	4,364	10,751	6,593
Net earnings	$ 9,801	$ 7,592	$ 18,307	$ 11,471
Weighted average common shares outstanding
Basic	26,102,129	25,992,505	26,078,188	25,984,188
Diluted	26,128,655	26,011,143	26,098,420	26,003,583
Per share amounts
Net earnings - basic	$ 0.38	$ 0.29	$ 0.70	$ 0.44
Net earnings - diluted	$ 0.38	$ 0.29	$ 0.70	$ 0.44
Cash dividends per share	$ 0.175	$ 0.175	$ 0.175	$ 0.350