Goodwill and Intangible Assets - Schedule of Goodwill (Details) $ in Thousands	9 Months Ended
Nov. 30, 2020 USD ($)
Goodwill [Roll Forward]
Balance as of February 29, 2020	$ 356,225
Allocated to disposal group	(1,693)
Foreign currency translation adjustment	692
Balance as of November 30, 2020	351,830
Galvabar
Goodwill [Roll Forward]
Allocated to divested businesses	(1,132)
Southern Mechanical Services
Goodwill [Roll Forward]
Allocated to divested businesses	(2,262)
Metal Coatings \| Operating Segments
Goodwill [Roll Forward]
Balance as of February 29, 2020	157,048
Allocated to disposal group	0
Foreign currency translation adjustment	692
Balance as of November 30, 2020	156,608
Metal Coatings \| Operating Segments \| Galvabar
Goodwill [Roll Forward]
Allocated to divested businesses	(1,132)
Metal Coatings \| Operating Segments \| Southern Mechanical Services
Goodwill [Roll Forward]
Allocated to divested businesses	0
Infrastructure Solutions \| Operating Segments
Goodwill [Roll Forward]
Balance as of February 29, 2020	199,177
Allocated to disposal group	(1,693)
Foreign currency translation adjustment	0
Balance as of November 30, 2020	195,222
Infrastructure Solutions \| Operating Segments \| Galvabar
Goodwill [Roll Forward]
Allocated to divested businesses	0
Infrastructure Solutions \| Operating Segments \| Southern Mechanical Services
Goodwill [Roll Forward]
Allocated to divested businesses	$ (2,262)

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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