CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Aug. 31, 2014	Feb. 28, 2014
Statement Of Financial Position [Abstract]
Allowance for doubtful receivable	$ 3,584	$ 3,672
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