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Segments (Details) - USD ($)
$ in Thousands
3 Months Ended
May 31, 2019
May 31, 2018
Feb. 28, 2019
Segment Reporting Information [Line Items]      
Property, Plant and Equipment, Net $ 206,305   $ 210,227
Operations and assets by segment      
Operating Income 30,974 $ 23,696  
Assets 1,135,679   1,088,570
Revenues 289,123 262,236  
Energy      
Operations and assets by segment      
Operating Income 12,571 9,958  
Assets 629,157   630,134
Revenues 166,969 146,986  
Metal Coatings      
Operations and assets by segment      
Operating Income 29,392 25,184  
Assets 487,922   440,090
Revenues 122,154 115,250  
Corporate      
Operations and assets by segment      
Operating Income (10,989) (11,446)  
Corporate      
Operations and assets by segment      
Assets 18,600   18,346
UNITED STATES      
Segment Reporting Information [Line Items]      
Property, Plant and Equipment, Net 185,294   189,281
Operations and assets by segment      
Revenues 230,337 213,606  
CANADA      
Segment Reporting Information [Line Items]      
Property, Plant and Equipment, Net 17,033   16,961
Other Countries [Member]      
Segment Reporting Information [Line Items]      
Property, Plant and Equipment, Net 3,978   $ 3,985
International [Member]      
Operations and assets by segment      
Revenues $ 58,786 $ 48,630