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Acquisitions (Details Textual) (USD $)
12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 2 Months Ended 12 Months Ended 1 Months Ended
Feb. 28, 2013
Feb. 29, 2012
Feb. 28, 2011
Feb. 28, 2013
G3 Galvananizing Limited [Member]
Jan. 02, 2013
G3 Galvananizing Limited [Member]
Feb. 28, 2013
Nuclear Logistics Incorporated [Member]
Jun. 02, 2012
Nuclear Logistics Incorporated [Member]
Oct. 01, 2012
Galvcast Manufacturing Inc [Member]
Feb. 28, 2013
Galvcast Manufacturing Inc [Member]
Feb. 01, 2012
Galvan Metal Inc [Member]
Aug. 03, 2010
North American Galvanazing and Coatings Inc [Member]
Feb. 28, 2013
North American Galvanazing and Coatings Inc [Member]
Feb. 29, 2012
North American Galvanazing and Coatings Inc [Member]
Feb. 28, 2011
North American Galvanazing and Coatings Inc [Member]
Jun. 14, 2010
North American Galvanazing and Coatings Inc [Member]
Feb. 29, 2012
Selling, General and Administrative Expenses [Member]
Galvan Metal Inc [Member]
Business Acquisition [Line Items]                                
Assets acquired         $ 12,000,000   $ 107,298,000 $ 48,000,000             $ 172,787,000  
Liabilities assumed         3,100,000     900,000                
Goodwill 171,886,270 121,383,863 113,463,000   4,200,000   32,323,000 15,700,000             43,109,000  
Acquisition related costs       500,000   700,000     300,000   1,900,000         500,000
Goodwill, deductible               75.00%                
Purchase price paid             77,000,000                  
Certain liabilities payoff             3,800,000                  
Additional payment on performance             20,000,000                  
Fair value the earn             8,500,000                  
Purchase price of acquisition                   29,100,000 132,000,000          
Purchase price of acquisition, net of cash 137,057,680 27,362,834 104,091,416             27,400,000 104,000,000          
Cash acquired from acquisition                   1,700,000 28,000,000          
Ownership percentage acquired                             83.00%  
Additional ownership acquired                     17.00%          
Intangible assets acquired             50,600,000               28,000,000  
Weighted average useful life                       12 years 4 months 24 days        
Net sales                         83,000,000 49,700,000    
Net income                         $ 18,600,000 $ 12,200,000