Consolidated Balance Sheets (Parenthetical) - $ / shares	Oct. 31, 2015	Oct. 31, 2014
Statement of Financial Position [Abstract]
Preferred stock, par value (usd per share)	$ 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 (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized	285,000,000	285,000,000
Common stock, shares issued	174,999,722	174,057,410
Treasury stock, shares	2,885,200	2,885,200