Consolidated Balance Sheets (Parenthetical) (USD $)	Oct. 31, 2013	Oct. 31, 2012
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	285,000,000	285,000,000
Common stock, shares issued	172,579,182	169,066,161
Treasury stock, shares	2,885,200	2,885,200