Acquisitions (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended				3 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2013 Aquilex [Member]	Nov. 30, 2012 Aquilex [Member]	Nov. 30, 2013 Nuclear Logistics Incorporated [Member]	Nov. 30, 2012 Nuclear Logistics Incorporated [Member]
Business Acquisition, Pro Forma Information [Abstract]
Net Sales	$ 570,712	$ 443,351	$ 197,755	$ 206,838	$ 197,755	$ 149,675
Net Income	$ 52,136	$ 47,426	$ 19,212	$ 17,762	$ 19,212	$ 15,364
Earnings Per Common Share
Basic earnings per share (usd per share)	$ 2.04	$ 1.87	$ 0.75	$ 0.70	$ 0.75	$ 0.61
Diluted Earnings Per Share (usd per share)	$ 2.03	$ 1.86	$ 0.75	$ 0.69	$ 0.75	$ 0.60