Consolidated Balance Sheets (Parenthetical) - $ / shares |
Jul. 31, 2017 |
Jul. 31, 2016 |
|---|---|---|
| Statement of Financial Position [Abstract] | ||
| Preferred stock, par value | $ 0.01 | $ 0.01 |
| Preferred stock, shares authorized | 5,000,000 | 5,000,000 |
| Preferred stock, shares issued | ||
| Preferred stock, shares outstanding | ||
| Common stock, par value | $ 0.01 | $ 0.01 |
| Common stock, shares authorized | 100,000,000 | 100,000,000 |
| Common stock, shares issued | 63,093,153 | 64,823,917 |
| Common stock, shares outstanding | 63,093,153 | 64,823,917 |