Consolidated Balance Sheets (Parenthetical) (USD $)	Oct. 31, 2011	Oct. 31, 2010
Consolidated Balance Sheets [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued
Preferred stock, shares outstanding
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	285,000,000	285,000,000
Common stock, shares issued	168,053,744	166,867,127
Treasury stock, shares	2,885,200	2,885,200