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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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