Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Nov. 30, 2012	Feb. 29, 2012
Consolidated Balance Sheets [Abstract]
Allowance for doubtful receivables	$ 3,683	$ 4,403
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
Treasury stock, shares	4,089,265	4,129,668