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Share-Based Payment Arrangement, Expense, Before Equity Classified Stock-Based Awards

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Discount rate from fair value on purchase date that participants pay for shares.

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Number of options outstanding, including both vested and non-vested options.

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Stock-Based Compensation (Expenses) (Details) - USD ($)	3 Months Ended
Stock-Based Compensation (Expenses) (Details) - USD ($)	Oct. 31, 2022	Oct. 31, 2021	Jul. 31, 2022
Stock-based Compensation Expenses
Stock-based compensation expense before CEO transition costs	$ 904,000	$ 921,000
CEO transition costs related to equity-classified stock-based awards	3,764,000	0
Total stock-based compensation expense before income tax benefit	4,668,000	921,000
Estimated Income tax benefit	(493,000)	(193,000)
Net stock-based compensation expense	4,175,000	728,000
Total remaining unrecognized compensation cost related to the unvested stock-based awards	11,988,000
Estimated forfeitures related to unvested stock-based awards	$ 812,000
Weighted average number of years net compensation cost is expected to be recognized over	2 years 9 months 18 days
Stock-based compensation capitalized and included in ending inventory	$ 48,000		$ 48,000
Stock options
Stock-based Compensation Expenses
Stock-based compensation expense before CEO transition costs	$ 25,000	78,000
Number of stock-based awards outstanding at period end (in shares)	474,020		483,480
Performance shares
Stock-based Compensation Expenses
Stock-based compensation expense before CEO transition costs	$ 74,000	349,000
RSUs and restricted stock
Stock-based Compensation Expenses
Stock-based compensation expense before CEO transition costs	774,000	439,000
ESPP
Stock-based Compensation Expenses
Stock-based compensation expense before CEO transition costs	$ 31,000	55,000
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)	474,020
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
Cost of sales
Stock-based Compensation Expenses
Stock-based compensation expense before CEO transition costs	$ 158,000	73,000
Selling, general and administrative expenses
Stock-based Compensation Expenses
Stock-based compensation expense before CEO transition costs	648,000	772,000
Research and development expenses
Stock-based Compensation Expenses
Stock-based compensation expense before CEO transition costs	$ 98,000	$ 76,000