Acquisitions (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2012	Nov. 30, 2011
Summary of acquisitions
Net Sales	$ 149,675	$ 126,181	$ 443,351	$ 381,287
Net Income	$ 15,364	$ 9,643	$ 47,369	$ 29,912
Earnings Per Common Share
Basic earnings per share (usd per share)	$ 0.61	$ 0.38	$ 1.87	$ 1.19
Diluted Earnings Per Share (usd per share)	$ 0.60	$ 0.38	$ 1.85	$ 1.18