Consolidated Balance Sheets (Parenthetical) (USD $)	Oct. 31, 2012	Oct. 31, 2011
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized, (in shares)	20,000,000	20,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	290,000,000	290,000,000
Common stock, shares issued (in shares)	100,601,792	97,440,436
Common stock, shares outstanding (in shares)	100,601,792	97,440,436