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Segments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Nov. 30, 2019
Nov. 30, 2018
Nov. 30, 2019
Nov. 30, 2018
Feb. 28, 2019
Segment Reporting Information [Line Items]          
Property, Plant and Equipment, Net $ 211,691   $ 211,691   $ 210,227
Operations and assets by segment          
Operating Income 33,428 $ 22,769 86,609 $ 63,570  
Assets 1,172,568   1,172,568   1,088,570
Revenues 291,139 239,516 816,452 724,539  
Energy          
Operations and assets by segment          
Operating Income 17,421 11,532 34,231 25,763  
Assets 645,918   645,918   630,134
Revenues 161,943 132,025 440,259 385,526  
Metal Coatings          
Operations and assets by segment          
Operating Income 27,258 18,321 85,323 65,581  
Assets 509,778   509,778   440,090
Revenues 129,196 107,491 376,193 339,013  
Corporate          
Operations and assets by segment          
Operating Income (11,251) (7,084) (32,945) (27,774)  
Corporate          
Operations and assets by segment          
Assets 16,872   16,872   18,346
UNITED STATES          
Segment Reporting Information [Line Items]          
Property, Plant and Equipment, Net 190,529   190,529   189,281
Operations and assets by segment          
Revenues 214,577 203,788 655,582 605,672  
CANADA          
Segment Reporting Information [Line Items]          
Property, Plant and Equipment, Net 16,864   16,864   16,961
Other Countries [Member]          
Segment Reporting Information [Line Items]          
Property, Plant and Equipment, Net 4,298   4,298   $ 3,985
International [Member]          
Operations and assets by segment          
Revenues $ 76,562 $ 35,728 $ 160,870 $ 118,867