Stock-Based Compensation (Expenses) (Details)	1 Months Ended	12 Months Ended
	Dec. 31, 2021 director	Jul. 31, 2023 USD ($) shares	Jul. 31, 2022 USD ($) shares	Jul. 31, 2021 USD ($) shares	Jul. 31, 2020 shares
Stock-based Compensation Expenses
Stock-based compensation expense (benefit) before income tax benefit		$ 10,107,000	$ 7,767,000	$ 9,983,000
CEO transition costs related to equity-classified stock-based awards		3,764,000	7,388,000	0
Total stock-based compensation expense before income tax benefit		13,871,000	15,155,000	9,983,000
Estimated income tax benefit		(2,552,000)	(2,260,000)	(2,164,000)
Net stock-based compensation expense		11,319,000	12,895,000	$ 7,819,000
Total remaining unrecognized compensation cost related to the unvested stock-based awards		7,812,000
Estimated forfeitures related to unvested stock-based awards		$ 530,000
Weighted average number of years net compensation cost is expected to be recognized over		2 years 3 months 18 days
Stock-based compensation capitalized and included in ending inventory		$ 198,000	$ 48,000
Number of stock-based awards outstanding at period end (in shares) | shares		240,510	483,480	1,073,435	1,422,025
Stock-based compensation related to retirement of Board of Directors			$ 827,000
Number of retired Board of Directors | director	3
Stock options
Stock-based Compensation Expenses
Stock-based compensation expense (benefit) before income tax benefit		$ 87,000	519,000	$ 370,000
Performance shares
Stock-based Compensation Expenses
Stock-based compensation expense (benefit) before income tax benefit		973,000	1,136,000	1,345,000
RSUs, restricted stock, share units and other stock-based awards
Stock-based Compensation Expenses
Stock-based compensation expense (benefit) before income tax benefit		8,926,000	5,912,000	8,060,000
ESPP
Stock-based Compensation Expenses
Stock-based compensation expense (benefit) before income tax benefit		$ 121,000	$ 200,000	208,000
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) | shares		0	0
2000 Stock Incentive Plan | Stock options
Stock-based Compensation Expenses
Number of stock-based awards outstanding at period end (in shares) | shares		240,510
Cost of sales
Stock-based Compensation Expenses
Stock-based compensation expense (benefit) before income tax benefit		$ 1,110,000	$ 692,000	929,000
Selling, general and administrative expenses
Stock-based Compensation Expenses
Stock-based compensation expense (benefit) before income tax benefit		7,960,000	6,312,000	8,091,000
Research and development expenses
Stock-based Compensation Expenses
Stock-based compensation expense (benefit) before income tax benefit		$ 1,037,000	$ 763,000	$ 963,000