Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Nov. 30, 2011	Feb. 28, 2011
Current assets
Allowance for doubtful receivables	$ 4,333	$ 4,814
Shareholders' equity
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
Treasury stock, shares	4,133,518	4,197,567