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Stock-Based Compensation (Expenses) (Details) - USD ($) | 12 Months Ended |
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Jul. 31, 2025 | Jul. 31, 2024 | Jul. 31, 2023 | Jul. 31, 2022
Stock-based Compensation Expenses |  |  |  |
Stock-based compensation expense (benefit) before income tax benefit | $ 3,120,000 | $ 6,096,000 | $ 10,107,000 |
CEO transition costs related to equity-classified stock-based awards | 0 | 0 | 3,764,000 |
Total stock-based compensation expense before income tax benefit | 3,120,000 | 6,096,000 | 13,871,000 |
Estimated income tax benefit | 0 | (1,298,000) | (2,552,000) |
Net stock-based compensation expense | 3,120,000 | $ 4,798,000 | $ 11,319,000 |
Total remaining unrecognized compensation cost related to the unvested stock-based awards | 4,778,000 |  |  |
Estimated forfeitures related to unvested stock-based awards | $ 342,000 |  |  |
Weighted average number of years net compensation cost is expected to be recognized over | 1 year 8 months 12 days |  |  |
Stock-based compensation capitalized and included in ending inventory | $ 198,000 |  |  |
Number of stock-based awards outstanding at period end (in shares) | 124,470 | 141,190 | 240,510 | 483,480
Stock options |  |  |  |
Stock-based Compensation Expenses |  |  |  |
Stock-based compensation expense (benefit) before income tax benefit | $ 29,000 | $ 60,000 | $ 87,000 |
Performance shares |  |  |  |
Stock-based Compensation Expenses |  |  |  |
Stock-based compensation expense (benefit) before income tax benefit | 72,000 | 480,000 | 973,000 |
RSUs, restricted stock, share units and other stock-based awards |  |  |  |
Stock-based Compensation Expenses |  |  |  |
Stock-based compensation expense (benefit) before income tax benefit | 2,973,000 | 5,477,000 | 8,926,000 |
ESPP |  |  |  |
Stock-based Compensation Expenses |  |  |  |
Stock-based compensation expense (benefit) before income tax benefit | $ 46,000 | $ 79,000 | 121,000 |
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) | 0 | 0 |  |
2000 Stock Incentive Plan | Stock options |  |  |  |
Stock-based Compensation Expenses |  |  |  |
Number of stock-based awards outstanding at period end (in shares) | 124,470 |  |  |
Cost of sales |  |  |  |
Stock-based Compensation Expenses |  |  |  |
Stock-based compensation expense (benefit) before income tax benefit | $ 392,000 | $ 778,000 | 1,110,000 |
Selling, general and administrative expenses |  |  |  |
Stock-based Compensation Expenses |  |  |  |
Stock-based compensation expense (benefit) before income tax benefit | 2,479,000 | 4,777,000 | 7,960,000 |
Research and development expenses |  |  |  |
Stock-based Compensation Expenses |  |  |  |
Stock-based compensation expense (benefit) before income tax benefit | $ 249,000 | $ 541,000 | $ 1,037,000 |

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