Acquisitions (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended				3 Months Ended
	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2013 Aquilex [Member]	Aug. 31, 2012 Aquilex [Member]	Aug. 31, 2013 Nuclear Logistics Incorporated [Member]	Aug. 31, 2012 Nuclear Logistics Incorporated [Member]
Business Acquisition, Pro Forma Information [Abstract]
Net Sales	$ 372,957	$ 293,677	$ 189,782	$ 195,010	$ 189,783	$ 153,385
Net Income	$ 30,910	$ 32,005	$ 16,363	$ 13,909	$ 16,363	$ 15,873
Earnings Per Common Share
Basic earnings per share (usd per share)	$ 1.21	$ 1.27	$ 0.64	$ 0.55	$ 0.64	$ 0.63
Diluted Earnings Per Share (usd per share)	$ 1.20	$ 1.26	$ 0.64	$ 0.55	$ 0.64	$ 0.62