Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Jul. 31, 2011	Oct. 31, 2010
Shareholders' equity:
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued
Common Class A [Member]
Common stock, $1.00 stated value:
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	86,845,776	88,739,140
Common stock, shares outstanding	86,845,776	88,739,140
Common Class B [Member]
Common stock, $1.00 stated value:
Common stock, par value	$ 1.00	$ 1.00
Common stock, shares authorized	5,000,000	5,000,000
Common stock, shares issued	3,555,020	3,555,020
Common stock, shares outstanding	3,555,020	3,555,020
Number of votes per share convertible into an equal number of Class A shares	10	10