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Operating segments (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Feb. 29, 2020
Nov. 30, 2019
Aug. 31, 2019
May 31, 2019
Feb. 28, 2019
Nov. 30, 2018
Aug. 31, 2018
May 31, 2018
Feb. 29, 2020
Feb. 28, 2019
Feb. 28, 2018
Operations and assets by segment                      
Revenues $ 245,365 $ 291,139 $ 236,190 $ 289,123 $ 202,548 $ 239,516 $ 222,787 $ 262,236 $ 1,061,817 $ 927,087 $ 810,430
Operating Income (Loss)                 79,343 76,956 48,248
Gain (Loss) on Disposition of Business (18,600)               (18,632) 0 0
Depreciation                 50,194 50,245 50,526
Payments to acquire property, plant, equipment and acquire businesses, net of cash                 95,672 33,616 74,397
Assets 1,073,831       1,088,570       1,073,831 1,088,570  
Property, Plant and Equipment, Net 213,104       210,227       213,104 210,227  
Energy [Member]                      
Operations and assets by segment                      
Revenues                 498,989 440,264 389,397
Operating Income (Loss)                 107,926 83,591 84,332
Depreciation                 30,042 29,124 28,617
Payments to acquire property, plant, equipment and acquire businesses, net of cash                 82,972 16,046 39,474
Assets 504,632       440,090       504,632 440,090  
Galvanizing Services [Member]                      
Operations and assets by segment                      
Revenues                 562,828 486,823 421,033
Operating Income (Loss)                 32,845 31,332 (1,766)
Depreciation                 18,414 19,405 19,996
Payments to acquire property, plant, equipment and acquire businesses, net of cash                 9,588 14,608 32,903
Assets 548,032       630,134       548,032 630,134  
Corporate, Non-Segment [Member]                      
Operations and assets by segment                      
Operating Income (Loss)                 (42,796) (37,967) (34,318)
Gain (Loss) on Disposition of Business                 (18,632) 0 0
Depreciation                 1,738 1,716 1,913
Payments to acquire property, plant, equipment and acquire businesses, net of cash                 3,112 2,962 2,020
Assets 21,167       18,346       21,167 18,346  
UNITED STATES                      
Operations and assets by segment                      
Revenues                 850,656 785,194 653,150
Property, Plant and Equipment, Net 190,365       189,281       190,365 189,281  
Non-US [Member]                      
Operations and assets by segment                      
Property, Plant and Equipment, Net 6,354       3,985       6,354 3,985  
CANADA                      
Operations and assets by segment                      
Property, Plant and Equipment, Net $ 16,385       $ 16,961       16,385 16,961  
Other Countries [Member]                      
Operations and assets by segment                      
Revenues                 $ 211,161 $ 141,893 $ 157,280