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Stock-Based Compensation (Expenses) (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2021 director | Jan. 31, 2022 USD ($) shares | Jan. 31, 2021 USD ($) | Jan. 31, 2022 USD ($) shares | Jan. 31, 2021 USD ($) | Oct. 31, 2021 shares | Jul. 31, 2021 USD ($) shares
Stock-based Compensation Expenses |  |  |  |  |  |  |
Stock-based compensation expense |  | $ 1,983,000 | $ 1,287,000 | $ 2,904,000 | $ 1,986,000 |  |
CEO transition costs related to equity-classified stock-based awards |  | 7,388,000 | 0 | 7,388,000 | 0 |  |
Total stock-based compensation expense before income tax benefit |  | 9,371,000 | 1,287,000 | 10,292,000 | 1,986,000 |  |
Estimated Income tax benefit |  | (1,030,000) | (280,000) | (1,223,000) | (424,000) |  |
Net stock-based compensation expense |  | 8,341,000 | 1,007,000 | 9,069,000 | 1,562,000 |  |
Total remaining unrecognized compensation cost related to the unvested stock-based awards |  | 10,024,000 |  | 10,024,000 |  |  |
Estimated forfeitures related to unvested stock-based awards |  | 895,000 |  | $ 895,000 |  |  |
Weighted average number of years net compensation cost is expected to be recognized over |  |  |  | 3 years 3 months 18 days |  |  |
Stock-based compensation capitalized and included in ending inventory |  | 48,000 |  | $ 48,000 |  |  | $ 48,000
Stock-based compensation related to retirement of Board of Directors |  | 827,000 |  | 827,000 |  |  |
Number of retired Board of Directors | director | 3 |  |  |  |  |  |
Former CEO |  |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |  |
CEO transition costs related to equity-classified stock-based awards |  | 7,388,000 |  | 7,388,000 |  |  |
Stock options |  |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |  |
Stock-based compensation expense |  | $ 364,000 | 97,000 | $ 442,000 | 217,000 |  |
Number of stock-based awards outstanding at period end (in shares) | shares |  | 1,005,935 |  | 1,005,935 |  | 1,015,965 | 1,073,435
Performance shares |  |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |  |
Stock-based compensation expense |  | $ 364,000 | 443,000 | $ 713,000 | 665,000 |  |
RSUs and restricted stock |  |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |  |
Stock-based compensation expense |  | 1,200,000 | 699,000 | 1,639,000 | 1,005,000 |  |
ESPP |  |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |  |
Stock-based compensation expense |  | $ 55,000 | 48,000 | $ 110,000 | 99,000 |  |
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) | shares |  | 1,005,935 |  | 1,005,935 |  |  |
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 |  |  | 0
Cost of sales |  |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |  |
Stock-based compensation expense |  | $ 76,000 | 59,000 | $ 149,000 | 132,000 |  |
Selling, general and administrative expenses |  |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |  |
Stock-based compensation expense |  | 1,836,000 | 1,158,000 | 2,608,000 | 1,700,000 |  |
Research and development expenses |  |  |  |  |  |  |
Stock-based Compensation Expenses |  |  |  |  |  |  |
Stock-based compensation expense |  | $ 71,000 | $ 70,000 | $ 147,000 | $ 154,000 |  |

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