Segments (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 30, 2021 USD ($)	Nov. 30, 2020 USD ($)	Nov. 30, 2021 USD ($) segment	Nov. 30, 2020 USD ($)	Feb. 28, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment			2
Operations and assets by segment
Revenues	$ 231,737	$ 226,623	$ 678,010	$ 643,287
Operating income:	30,092	27,871	87,332	42,840
Total assets:	1,037,576		1,037,576		$ 996,442
Property, plant and equipment, net	199,886		199,886		205,909
United States
Operations and assets by segment
Revenues	202,998	180,429	586,584	540,162
Property, plant and equipment, net	178,020		178,020		180,718
International
Operations and assets by segment
Revenues	28,739	46,194	91,426	103,125
Canada
Operations and assets by segment
Property, plant and equipment, net	11,968		11,968		15,007
Other countries
Operations and assets by segment
Property, plant and equipment, net	9,898		9,898		10,184
Corporate
Operations and assets by segment
Operating income:	(11,821)	(9,522)	(34,394)	(29,879)
Total assets:	27,889		27,889		25,678
Metal Coatings | Operating Segments
Operations and assets by segment
Revenues	133,373	115,616	390,701	351,643
Operating income:	32,724	28,671	95,888	69,355
Total assets:	493,700		493,700		480,778
Infrastructure Solutions | Operating Segments
Operations and assets by segment
Revenues	98,364	111,007	287,309	291,644
Operating income:	9,189	$ 8,722	25,838	$ 3,364
Total assets:	$ 515,987		$ 515,987		$ 489,986