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Stock-Based Compensation - Overview (Details) - shares | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2016 | Jan. 31, 2016 | Dec. 31, 2015 | Oct. 31, 2015 | Jul. 31, 2015
Stock options |  |  |  |  |
Stock-Based Awards Outstanding By Award Type (In Shares) |  |  |  |  |
Number of stock-based option awards outstanding at period end | 2,362,198 | 2,350,258 |  | 2,398,498 | 2,119,683
2000 Stock Incentive Plan |  |  |  |  |
2000 Stock Incentive Plan |  |  |  |  |
Aggregate maximum number of shares of common stock which may be issued under stock option plan | 8,962,500 |  |  |  |
Aggregate net number of stock-based awards granted | 7,737,852 |  |  |  |
Aggregate number of stock based awards expired and canceled | 3,157,309 |  |  |  |
Aggregate number of stock-based awards exercised | 5,143,687 |  |  |  |
Stock-Based Awards Outstanding By Award Type (In Shares) |  |  |  |  |
Number of total stock-based awards outstanding | 2,594,165 |  |  |  |
2000 Stock Incentive Plan | Stock options |  |  |  |  |
2000 Stock Incentive Plan |  |  |  |  |
Maximum term for grants of incentive and non-qualified stock-based awards, excluding incentive stock-based awards granted to stockholders who own more than 10% of the voting power | 10 years |  |  |  |
Percentage of a stockholder's voting power that limits the contractual term of an incentive stock-based award | 10.00% |  |  |  |
Maximum term for incentive stock-based awards granted to stockholders who own more than 10% of the voting power | 5 years |  |  |  |
Stock-Based Awards Outstanding By Award Type (In Shares) |  |  |  |  |
Number of stock-based option awards outstanding at period end | 2,362,198 |  |  |  |
2000 Stock Incentive Plan | Performance shares |  |  |  |  |
Stock-Based Awards Outstanding By Award Type (In Shares) |  |  |  |  |
Number of stock-based non-option awards outstanding at period end | 183,665 |  |  |  |
2000 Stock Incentive Plan | RSUs and restricted stock |  |  |  |  |
Stock-Based Awards Outstanding By Award Type (In Shares) |  |  |  |  |
Number of stock-based non-option awards outstanding at period end | 39,799 |  |  |  |
2000 Stock Incentive Plan | Share units |  |  |  |  |
Stock-Based Awards Outstanding By Award Type (In Shares) |  |  |  |  |
Number of stock-based non-option awards outstanding at period end | 8,503 |  |  |  |
2001 Employee Stock Purchase Plan | Employee Stock Purchase Plan - ESPP |  |  |  |  |
2000 Stock Incentive Plan |  |  |  |  |
Aggregate maximum number of shares of common stock which may be issued under stock option plan | 800,000 |  | 675,000 |  |
2001 Employee Stock Purchase Plan |  |  |  |  |
Discount rate from market value, on purchase date, offered to employees participating in the Employee Stock Purchase Plan (ESPP) | 85.00% |  |  |  |
Total number of shares of common stock issued to employees under employee stock purchase plan and through the end of the reporting period | 618,123 |  |  |  |

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