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 |