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Operating segments (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Feb. 28, 2021
Nov. 30, 2020
Aug. 31, 2020
May 31, 2020
Feb. 29, 2020
Nov. 30, 2019
Aug. 31, 2019
May 31, 2019
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2019
Operations and assets by segment                      
Sales $ 195,629 $ 226,623 $ 203,372 $ 213,293 $ 245,365 $ 291,139 $ 236,190 $ 289,123 $ 838,917 $ 1,061,817 $ 927,087
Operating income (loss)                 61,614 79,343 76,956
Loss on disposal of business 18,600               3,080 18,632 0
Depreciation                 44,603 50,194 50,245
Expenditures for acquisitions, net of cash, and property, plant and equipment:                 41,498 93,223 32,615
Assets: 996,442       1,073,831       996,442 1,073,831  
Property, plant and equipment, net 205,909       213,104       205,909 213,104  
Asset impairment charges                 13,700 9,200 800
Corporate                      
Operations and assets by segment                      
Operating income (loss)                 (40,819) (42,796) (37,967)
Loss on disposal of business                 0 (18,632) 0
Depreciation                 1,695 1,738 1,716
Expenditures for acquisitions, net of cash, and property, plant and equipment:                 2,574 2,725 2,902
Assets: 25,678       21,167       25,678 21,167  
United States                      
Operations and assets by segment                      
Sales                 711,696 850,656 785,194
Property, plant and equipment, net 180,718       190,365       180,718 190,365  
International                      
Operations and assets by segment                      
Sales                 127,221 211,161 141,893
Canada                      
Operations and assets by segment                      
Property, plant and equipment, net 15,007       16,385       15,007 16,385  
Other countries                      
Operations and assets by segment                      
Property, plant and equipment, net 10,184       6,354       10,184 6,354  
Metal Coatings | Operating Segments                      
Operations and assets by segment                      
Sales                 457,791 498,989 440,264
Operating income (loss)                 95,946 107,926 83,591
Loss on disposal of business                 1,221    
Depreciation                 29,930 30,042 29,124
Expenditures for acquisitions, net of cash, and property, plant and equipment:                 29,305 81,340 15,238
Assets: 480,778       504,632       480,778 504,632  
Infrastructure Solutions | Operating Segments                      
Operations and assets by segment                      
Sales                 381,126 562,828 486,823
Operating income (loss)                 6,487 32,845 31,332
Loss on disposal of business                 1,859    
Depreciation                 12,978 18,414 19,405
Expenditures for acquisitions, net of cash, and property, plant and equipment:                 9,619 9,158 $ 14,475
Assets: $ 489,986       $ 548,032       $ 489,986 548,032  
Asset impairment charges                   9,200  
Infrastructure Solutions | Operating Segments | Selling, general and administrative                      
Operations and assets by segment                      
Asset impairment charges                   7,200  
Infrastructure Solutions | Operating Segments | Cost of sales                      
Operations and assets by segment                      
Asset impairment charges                   $ 2,000