Consolidated Condensed Balance Sheets (Parenthetical) - $ / shares |
Jan. 31, 2016 |
Jul. 31, 2015 |
Jan. 31, 2015 |
|---|---|---|---|
| Preferred stock, par value (in dollars per share) | $ 0.01 | $ 0.01 | $ 0.01 |
| Preferred stock, shares authorized | 25,000,000 | 25,000,000 | 25,000,000 |
| Preferred stock, shares issued | 0 | 0 | 0 |
| Preferred stock, shares outstanding | 0 | 0 | 0 |
| Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01 | $ 0.01 |
| Common stock, shares authorized | 100,000,000 | 100,000,000 | 100,000,000 |
| Common stock, shares issued | 41,578,019 | 41,462,941 | 41,294,906 |
| Treasury stock, shares | 5,326,941 | 4,949,111 | 4,949,111 |