Unaudited Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	May 31, 2021	Feb. 28, 2021
Statement Of Financial Position [Abstract]
Allowance for doubtful receivables	$ 954	$ 961
Preferred stock, par value	$ 10	$ 10
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 2.50	$ 2.50
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	30,053,443	30,053,443