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Segments (Details) - USD ($)
$ in Thousands
3 Months Ended
May 31, 2020
May 31, 2019
Feb. 29, 2020
Segment Reporting Information [Line Items]      
Property, Plant and Equipment, Net $ 214,965   $ 213,104
Operations and assets by segment      
Operating Income 14,318 $ 30,974  
Assets 1,050,773   1,073,831
Revenues 213,293 289,123  
Metal Coatings      
Operations and assets by segment      
Operating Income 25,085 29,392  
Assets 497,742   504,632
Revenues 118,991 122,154  
Energy      
Operations and assets by segment      
Operating Income (1,048) 12,571  
Assets 525,125   548,032
Revenues 94,302 166,969  
Corporate      
Operations and assets by segment      
Operating Income (9,719) (10,989)  
Corporate      
Operations and assets by segment      
Assets 27,906   21,167
UNITED STATES      
Segment Reporting Information [Line Items]      
Property, Plant and Equipment, Net 194,012   190,365
Operations and assets by segment      
Revenues 190,842 230,337  
CANADA      
Segment Reporting Information [Line Items]      
Property, Plant and Equipment, Net 15,647   16,385
Other Countries [Member]      
Segment Reporting Information [Line Items]      
Property, Plant and Equipment, Net 5,306   $ 6,354
International [Member]      
Operations and assets by segment      
Revenues $ 22,451 $ 58,786