CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Apr. 30, 2017	Oct. 31, 2016
Stockholders’ equity:
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)	141,768,448	139,767,627
Common stock, shares outstanding (in shares)	141,768,448	139,767,627