Consolidated Balance Sheets (Parenthetical) (USD $)	Oct. 31, 2011	Oct. 31, 2010
Stockholders' equity:
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	290,000,000	290,000,000
Common stock, shares issued	97,440,436	94,060,300
Common stock, shares outstanding	97,440,436	94,060,300