CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	May 31, 2013	Feb. 28, 2013
Statement Of Financial Position [Abstract]
Allowance for doubtful receivables	$ 2,707	$ 3,952
Preferred stock, par value	$ 10	$ 10
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued
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