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Stock-Based Compensation (Expenses) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Jul. 31, 2021 | Jul. 31, 2020 | Jul. 31, 2019 | Jul. 31, 2018
Stock-based Compensation Expenses |  |  |  |
Stock-based compensation expense (benefit) before income tax benefit | $ 9,983,000 | $ 9,275,000 | $ 11,427,000 |
Estimated Income tax benefit | (2,164,000) | (2,042,000) | (2,553,000) |
Net stock-based compensation expense | 7,819,000 | 7,233,000 | $ 8,874,000 |
Total remaining unrecognized compensation cost related to the unvested stock-based awards | 9,625,000 |  |  |
Estimated forfeitures related to unvested stock-based awards | $ 1,040,000 |  |  |
Weighted average number of years net compensation cost is expected to be recognized over | 3 years |  |  |
Stock-based compensation capitalized and included in ending inventory | $ 48,000 | $ 48,000 |  |
Number of stock-based awards outstanding at period end (in shares) | 1,073,435 | 1,422,025 | 1,555,555 | 1,668,975
Stock options |  |  |  |
Stock-based Compensation Expenses |  |  |  |
Stock-based compensation expense (benefit) before income tax benefit | $ 370,000 | $ 442,000 | $ 739,000 |
Performance shares |  |  |  |
Stock-based Compensation Expenses |  |  |  |
Stock-based compensation expense (benefit) before income tax benefit | 1,345,000 | 1,491,000 | 1,554,000 |
RSUs and restricted stock |  |  |  |
Stock-based Compensation Expenses |  |  |  |
Stock-based compensation expense (benefit) before income tax benefit | 2,985,000 | 2,543,000 | 2,149,000 |
ESPP |  |  |  |
Stock-based Compensation Expenses |  |  |  |
Stock-based compensation expense (benefit) before income tax benefit | $ 208,000 | 222,000 | 215,000 |
Discount offered to employees participating in the ESPP as a percentage of market price | 15.00% |  |  |
Share units |  |  |  |
Stock-based Compensation Expenses |  |  |  |
Stock-based compensation expense (benefit) before income tax benefit | $ 5,075,000 | 4,577,000 | 6,770,000 |
Recoupment of share units |  |  |  |
Stock-based Compensation Expenses |  |  |  |
Stock-based compensation expense (benefit) before income tax benefit | $ (616,000) | $ (310,000) | (130,000) |
2000 Stock Incentive Plan | Stock appreciation rights (SARs) |  |  |  |
Stock-based Compensation Expenses |  |  |  |
Number of stock-based awards outstanding at period end (in shares) | 0 | 0 |  |
2000 Stock Incentive Plan | Stock options |  |  |  |
Stock-based Compensation Expenses |  |  |  |
Number of stock-based awards outstanding at period end (in shares) | 1,073,435 |  |  |
Cost of sales |  |  |  |
Stock-based Compensation Expenses |  |  |  |
Stock-based compensation expense (benefit) before income tax benefit | $ 929,000 | $ 823,000 | 1,047,000 |
Selling, general and administrative expenses |  |  |  |
Stock-based Compensation Expenses |  |  |  |
Stock-based compensation expense (benefit) before income tax benefit | 8,091,000 | 7,527,000 | 9,336,000 |
Research and development expenses |  |  |  |
Stock-based Compensation Expenses |  |  |  |
Stock-based compensation expense (benefit) before income tax benefit | $ 963,000 | $ 925,000 | $ 1,044,000 |

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