Acquisitions - Purchase Price Allocation (Details) (USD $)	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2011	Jun. 02, 2012 Nuclear Logistics Incorporated [Member]	Jun. 14, 2010 North American Galvanazing and Coatings Inc [Member]
Purchase Price Allocation
Current Assets				$ 22,901,000	$ 58,176,000
Property and Equipment				1,416,000	40,552,000
Intangible Assets				50,600,000	28,000,000
Goodwill	171,886,270	121,383,863	113,463,000	32,323,000	43,109,000
Other Assets				58,000	2,950,000
Total Assets Acquired				107,298,000	172,787,000
Current Liabilities				(17,866,000)	(11,670,000)
Long Term Liabilities				(12,388,000)	(28,673,000)
Net Assets Acquired				$ 77,044,000	$ 132,444,000