Restructuring and Impairment Charges (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 29, 2020	Feb. 28, 2021	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2019
Restructuring Cost and Reserve [Line Items]
Loss on disposal of business		$ 18,600	$ 3,080	$ 18,632	$ 0
Write down of excess inventory			2,511	0	$ 0
Inventory write-downs		(9,200)
Restructuring charges			1,300
Impaired Assets to be Disposed of by Method Other than Sale, Amount of Impairment Loss				9,200
Cost of sales
Restructuring Cost and Reserve [Line Items]
Impaired Assets to be Disposed of by Method Other than Sale, Amount of Impairment Loss				2,000
Cost of sales | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			800
Cost of sales | One-time Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			500
Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Impaired Assets to be Disposed of by Method Other than Sale, Amount of Impairment Loss				$ 7,200
Operating Segments | Infrastructure Solutions
Restructuring Cost and Reserve [Line Items]
Loss on disposal of business			1,859
Write down of excess inventory			2,511
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