Consolidated Condensed Balance Sheets (Parenthetical) - $ / shares |
Jan. 31, 2017 |
Jul. 31, 2016 |
Jan. 31, 2016 |
|---|---|---|---|
| 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 | 45,419,228 | 41,614,432 | 41,578,019 |
| Exchangeable Shares, Par Value Per Share | $ 0.01 | $ 0.00 | $ 0.00 |
| Exchangeable Shares, Shares, Issued | 73,047 | 0 | 0 |
| Treasury stock, shares | 5,436,294 | 5,434,977 | 5,326,941 |