Acquisitions (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	May 31, 2013 Aquilex [Member]	May 31, 2012 Aquilex [Member]	Feb. 28, 2013 Nuclear Logistics Incorporated [Member]	Feb. 29, 2012 Nuclear Logistics Incorporated [Member]
Business Acquisition, Pro Forma Information [Abstract]
Net Sales	$ 206,270	$ 199,706	$ 183,175	$ 140,291
Net Income	$ 17,429	$ 17,801	$ 14,547	$ 16,189
Earnings Per Common Share
Basic earnings per share (usd per share)	$ 0.68	$ 0.71	$ 0.57	$ 0.64
Diluted Earnings Per Share (usd per share)	$ 0.68	$ 0.70	$ 0.57	$ 0.64