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Stock-Based Compensation (Expenses) (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 12, 2024 | Apr. 30, 2024 | Apr. 30, 2023 | Apr. 30, 2024 | Apr. 30, 2023 | Jan. 31, 2024 | Oct. 31, 2023 | Jul. 31, 2023
Stock-based Compensation Expenses |  |  |  |  |  |  |  |
Stock-based compensation expense before CEO transition costs |  | $ 404,000 | $ 4,126,000 | $ 5,238,000 | $ 6,298,000 |  |  |
CEO transition costs related to equity-classified stock-based awards |  | 0 | 0 | 0 | 3,764,000 |  |  |
Total stock-based compensation expense before income tax benefit |  | 404,000 | 4,126,000 | 5,238,000 | 10,062,000 |  |  |
Estimated Income tax benefit |  | (81,000) | (915,000) | (1,149,000) | (1,701,000) |  |  |
Net stock-based compensation expense |  | 323,000 | 3,211,000 | 4,089,000 | 8,361,000 |  |  |
Total remaining unrecognized compensation cost related to the unvested stock-based awards |  | 6,819,000 |  | 6,819,000 |  |  |  |
Estimated forfeitures related to unvested stock-based awards |  | 833,000 |  | $ 833,000 |  |  |  |
Weighted average number of years net compensation cost is expected to be recognized over |  |  |  | 1 year 10 months 24 days |  |  |  |
Stock-based compensation capitalized and included in ending inventory |  | 198,000 |  | $ 198,000 |  |  |  | $ 198,000
Stock options |  |  |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |  |  |
Stock-based compensation expense before CEO transition costs |  | $ 11,000 | 22,000 | $ 42,000 | 66,000 |  |  |
Number of stock-based awards outstanding at period end (in shares) |  | 170,150 |  | 170,150 |  | 224,580 | 234,260 | 240,510
Performance shares |  |  |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |  |  |
Stock-based compensation expense before CEO transition costs |  | $ (662,000) | 335,000 | $ 280,000 | 690,000 |  |  |
RSUs and restricted stock |  |  |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |  |  |
Stock-based compensation expense before CEO transition costs |  | 1,040,000 | 3,738,000 | 4,850,000 | 5,449,000 |  |  |
ESPP |  |  |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |  |  |
Stock-based compensation expense before CEO transition costs |  | $ 15,000 | 31,000 | $ 66,000 | 93,000 |  |  |
Discount offered to employees participating in the ESPP as a percentage of market price |  |  |  | 15.00% |  |  |  |
RSU and Performance Shares |  |  |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |  |  |
Performance shares cancelled (in shares) | 581,021 |  |  |  |  |  |  |
2000 Stock Incentive Plan | Stock options |  |  |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |  |  |
Number of stock-based awards outstanding at period end (in shares) |  | 170,150 |  | 170,150 |  |  |  |
Cost of sales |  |  |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |  |  |
Stock-based compensation expense before CEO transition costs |  | $ 67,000 | 141,000 | $ 480,000 | 452,000 |  |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |  |  |
Stock-based compensation expense before CEO transition costs |  | 313,000 | 3,896,000 | 4,480,000 | 5,559,000 |  |  |
Research and development expenses |  |  |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |  |  |
Stock-based compensation expense before CEO transition costs |  | $ 24,000 | $ 89,000 | $ 278,000 | $ 287,000 |  |  |

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