Segments (Details) $ in Thousands	3 Months Ended
	May 31, 2021 USD ($) segment	May 31, 2020 USD ($)	Feb. 28, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment	2
Operations and assets by segment
Revenues	$ 229,826	$ 213,293
Operating income:	30,712	14,318
Total assets:	1,039,239		$ 996,442
Property, plant and equipment, net	207,689		205,909
United States
Operations and assets by segment
Revenues	191,116	190,842
Property, plant and equipment, net	180,004		180,718
International
Operations and assets by segment
Revenues	38,710	22,451
Canada
Operations and assets by segment
Property, plant and equipment, net	14,953		15,007
Other countries
Operations and assets by segment
Property, plant and equipment, net	12,732		10,184
Corporate
Operations and assets by segment
Operating income:	(10,488)	(9,719)
Total assets:	27,485		25,678
Metal Coatings | Operating Segments
Operations and assets by segment
Revenues	127,735	118,991
Operating income:	31,576	25,085
Total assets:	490,326		480,778
Infrastructure Solutions | Operating Segments
Operations and assets by segment
Revenues	102,091	94,302
Operating income:	9,624	$ (1,048)
Total assets:	$ 521,428		$ 489,986