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Stock-Based Compensation (Expenses) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2025 | Jan. 31, 2024 | Jan. 31, 2025 | Jan. 31, 2024 | Oct. 31, 2024 | Jul. 31, 2024
Stock-based Compensation Expenses |  |  |  |  |  |
Stock-based compensation expense before CEO transition costs |  |  | $ 1,325,000 | $ 4,834,000 |  |
Stock-based compensation expense before income tax benefit | $ 1,170,000 | $ 2,189,000 | 1,325,000 | 4,834,000 |  |
Estimated Income tax benefit | (244,000) | (484,000) | (264,000) | (1,068,000) |  |
Net stock-based compensation expense | 926,000 | 1,705,000 | 1,061,000 | 3,766,000 |  |
Total remaining unrecognized compensation cost related to the unvested stock-based awards | 7,371,000 |  | 7,371,000 |  |  |
Estimated forfeitures related to unvested stock-based awards | 548,000 |  | $ 548,000 |  |  |
Weighted average number of years net compensation cost is expected to be recognized over |  |  | 2 years |  |  |
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 | $ 3,000 | 12,000 | $ 20,000 | 31,000 |  |
Number of stock-based awards outstanding at period end (in shares) | 135,690 |  | 135,690 |  | 141,190 | 141,190
Performance shares |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |
Stock-based compensation expense before CEO transition costs | $ 302,000 | 585,000 | $ (95,000) | 942,000 |  |
RSUs and restricted stock |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |
Stock-based compensation expense before CEO transition costs | 850,000 | 1,566,000 | 1,371,000 | 3,810,000 |  |
ESPP |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |
Stock-based compensation expense before CEO transition costs | $ 15,000 | 26,000 | $ 29,000 | 51,000 |  |
Discount offered to employees participating in the ESPP as a percentage of market price |  |  | 15.00% |  |  |
2000 Stock Incentive Plan | Stock options |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |
Number of stock-based awards outstanding at period end (in shares) | 135,690 |  | 135,690 |  |  |
Cost of sales |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |
Stock-based compensation expense before CEO transition costs | $ 96,000 | 131,000 | $ 200,000 | 413,000 |  |
Selling, general and administrative expenses |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |
Stock-based compensation expense before CEO transition costs | 1,014,000 | 1,991,000 | 1,000,000 | 4,167,000 |  |
Research and development expenses |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |
Stock-based compensation expense before CEO transition costs | $ 60,000 | $ 67,000 | $ 125,000 | $ 254,000 |  |

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