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Restructuring and Impairment Charges - Schedule of Restructuring Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Aug. 31, 2020
Aug. 31, 2019
Aug. 31, 2020
Aug. 31, 2019
Restructuring and Related Activities [Abstract]        
Restructuring and impairment charges $ 18,693 $ 0 $ 18,693 $ 0
Restructuring Cost and Reserve [Line Items]        
Write down on assets held for sale to estimated sales price     7,261  
Write down of assets expected to be abandoned     6,965  
Loss on disposal of business     1,198 0
Write down of excess inventory     2,511  
Costs associated with assets held for sale     758  
Total charges 18,693 0 18,693 0
Metal Coatings        
Restructuring Cost and Reserve [Line Items]        
Write down on assets held for sale to estimated sales price 2,999 0 2,999 0
Write down of excess inventory $ 336 $ 0 336 $ 0
Metal Coatings | Operating Segments        
Restructuring and Related Activities [Abstract]        
Restructuring and impairment charges     11,324  
Restructuring Cost and Reserve [Line Items]        
Write down on assets held for sale to estimated sales price     3,161  
Write down of assets expected to be abandoned     6,965  
Loss on disposal of business     1,198  
Write down of excess inventory     0  
Costs associated with assets held for sale     0  
Total charges     11,324  
Infrastructure Solutions | Operating Segments        
Restructuring and Related Activities [Abstract]        
Restructuring and impairment charges     7,369  
Restructuring Cost and Reserve [Line Items]        
Write down on assets held for sale to estimated sales price     4,100  
Write down of assets expected to be abandoned     0  
Loss on disposal of business     0  
Write down of excess inventory     2,511  
Costs associated with assets held for sale     758  
Total charges     $ 7,369