Sales Disaggregated Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2021	Nov. 30, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 231,737	$ 226,623	$ 678,010	$ 643,287
Industrial
Disaggregation of Revenue [Line Items]
Revenues	141,360	138,240	420,367	335,462
Transmission and distribution
Disaggregation of Revenue [Line Items]
Revenues	57,934	56,656	149,162	203,332
Power generation
Disaggregation of Revenue [Line Items]
Revenues	$ 32,443	$ 31,727	$ 108,481	$ 104,493