Consolidated Statement of Financial Position (Parenthetical) (USD $)	Feb. 28, 2011	Feb. 28, 2010
Class A
SHAREHOLDERS' EQUITY
Common shares, par Value	$ 1	$ 1
Common stock, shares issued	82,181,659	80,884,505
Treasury stock, shares	44,711,736	44,627,298
Class B
SHAREHOLDERS' EQUITY
Common shares, par Value	$ 1	$ 1
Common stock, shares issued	6,066,092	6,066,092
Treasury stock, shares	3,128,841	2,843,069