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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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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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