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Stock-Based Compensation (Expenses) (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2021 director | Jul. 31, 2023 USD ($) shares | Jul. 31, 2022 USD ($) shares | Jul. 31, 2021 USD ($) shares | Jul. 31, 2020 shares
Stock-based Compensation Expenses |  |  |  |  |
Stock-based compensation expense (benefit) before income tax benefit |  | $ 10,107,000 | $ 7,767,000 | $ 9,983,000 |
CEO transition costs related to equity-classified stock-based awards |  | 3,764,000 | 7,388,000 | 0 |
Total stock-based compensation expense before income tax benefit |  | 13,871,000 | 15,155,000 | 9,983,000 |
Estimated income tax benefit |  | (2,552,000) | (2,260,000) | (2,164,000) |
Net stock-based compensation expense |  | 11,319,000 | 12,895,000 | $ 7,819,000 |
Total remaining unrecognized compensation cost related to the unvested stock-based awards |  | 7,812,000 |  |  |
Estimated forfeitures related to unvested stock-based awards |  | $ 530,000 |  |  |
Weighted average number of years net compensation cost is expected to be recognized over |  | 2 years 3 months 18 days |  |  |
Stock-based compensation capitalized and included in ending inventory |  | $ 198,000 | $ 48,000 |  |
Number of stock-based awards outstanding at period end (in shares) | shares |  | 240,510 | 483,480 | 1,073,435 | 1,422,025
Stock-based compensation related to retirement of Board of Directors |  |  | $ 827,000 |  |
Number of retired Board of Directors | director | 3 |  |  |  |
Stock options |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |
Stock-based compensation expense (benefit) before income tax benefit |  | $ 87,000 | 519,000 | $ 370,000 |
Performance shares |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |
Stock-based compensation expense (benefit) before income tax benefit |  | 973,000 | 1,136,000 | 1,345,000 |
RSUs, restricted stock, share units and other stock-based awards |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |
Stock-based compensation expense (benefit) before income tax benefit |  | 8,926,000 | 5,912,000 | 8,060,000 |
ESPP |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |
Stock-based compensation expense (benefit) before income tax benefit |  | $ 121,000 | $ 200,000 | 208,000 |
Discount offered to employees participating in the ESPP as a percentage of market price |  | 15.00% |  |  |
2000 Stock Incentive Plan | Stock appreciation rights (SARs) |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |
Number of stock-based awards outstanding at period end (in shares) | shares |  | 0 | 0 |  |
2000 Stock Incentive Plan | Stock options |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |
Number of stock-based awards outstanding at period end (in shares) | shares |  | 240,510 |  |  |
Cost of sales |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |
Stock-based compensation expense (benefit) before income tax benefit |  | $ 1,110,000 | $ 692,000 | 929,000 |
Selling, general and administrative expenses |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |
Stock-based compensation expense (benefit) before income tax benefit |  | 7,960,000 | 6,312,000 | 8,091,000 |
Research and development expenses |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |
Stock-based compensation expense (benefit) before income tax benefit |  | $ 1,037,000 | $ 763,000 | $ 963,000 |

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