Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Feb. 28, 2017	Feb. 29, 2016
Statement of Financial Position [Abstract]
Allowance for doubtful receivables	$ 1,674	$ 2,041
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