Consolidated Statements of Earnings (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Feb. 29, 2012	Feb. 28, 2011	Feb. 28, 2010
Consolidated Statements of Earnings [Abstract]
Net sales	$ 517,014	$ 549,999	$ 517,738
Cost of goods sold	386,501	395,501	382,419
Gross profit margin	130,513	154,498	135,319
Selling, general and administrative	78,962	83,678	76,738
Gain from disposal of assets	(137)	(1)	(1)
Income from operations	51,688	70,821	58,582
Other expense
Interest expense	(2,285)	(1,234)	(2,627)
Other, net	(23)	(170)	(286)
Total other expense	(2,308)	(1,404)	(2,913)
Earnings before income taxes	49,380	69,417	55,669
Provision for income taxes	18,022	24,786	20,463
Net earnings	$ 31,358	$ 44,631	$ 35,206
Weighted average common shares outstanding
Basic	25,946,107	25,855,129	25,768,632
Diluted	25,967,677	25,887,995	25,796,553
Per share amounts
Net earnings - basic	$ 1.21	$ 1.73	$ 1.37
Net earnings - diluted	$ 1.21	$ 1.72	$ 1.36
Cash dividends per share	$ 0.62	$ 0.62	$ 0.62