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Restructuring and Impairment Charges (Details) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended	12 Months Ended
	Feb. 29, 2020	Nov. 30, 2020	Feb. 28, 2022	Feb. 28, 2021	Feb. 29, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment charges			$ (1,797)	$ 19,999	$ 18,632
Other			(477)	(1,693)
Loss on disposal of business			552	3,080	18,632
Impairment charges					9,200
Assets held for sale			235	235
Cost of sales
Restructuring Cost and Reserve [Line Items]
Impairment charges					2,000
Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Impairment charges					$ 7,200
Operating Segments \| Infrastructure Solutions
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment charges				9,203
Other			$ 0	(1,693)
Loss on disposal of business				1,859
Operating Segments \| Infrastructure Solutions \| Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment charges				3,900
Galvabar
Restructuring Cost and Reserve [Line Items]
Proceeds from sale of subsidiaries, net				8,300
Loss on disposal of business				1,200
Southern Mechanical Services
Restructuring Cost and Reserve [Line Items]
Proceeds from sale of subsidiaries, net				4,100
Loss on disposal of business		$ 1,900
Intangible impairment				$ 900
Nuclear Logistics Business [Member] \| Disposal Group, Disposed of by Sale, Not Discontinued Operations
Restructuring Cost and Reserve [Line Items]
Proceeds from sale of subsidiaries, net	$ 23,600
Loss on disposal of business	$ 18,600