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Stock-Based Compensation (Expenses) (Details) - USD ($)	12 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Stock-based Compensation Expenses
Stock-based compensation expense (benefit) before income tax benefit	$ 9,983,000	$ 9,275,000	$ 11,427,000
Estimated Income tax benefit	(2,164,000)	(2,042,000)	(2,553,000)
Net stock-based compensation expense	7,819,000	7,233,000	$ 8,874,000
Total remaining unrecognized compensation cost related to the unvested stock-based awards	9,625,000
Estimated forfeitures related to unvested stock-based awards	$ 1,040,000
Weighted average number of years net compensation cost is expected to be recognized over	3 years
Stock-based compensation capitalized and included in ending inventory	$ 48,000	$ 48,000
Number of stock-based awards outstanding at period end (in shares)	1,073,435	1,422,025	1,555,555	1,668,975
Stock options
Stock-based Compensation Expenses
Stock-based compensation expense (benefit) before income tax benefit	$ 370,000	$ 442,000	$ 739,000
Performance shares
Stock-based Compensation Expenses
Stock-based compensation expense (benefit) before income tax benefit	1,345,000	1,491,000	1,554,000
RSUs and restricted stock
Stock-based Compensation Expenses
Stock-based compensation expense (benefit) before income tax benefit	2,985,000	2,543,000	2,149,000
ESPP
Stock-based Compensation Expenses
Stock-based compensation expense (benefit) before income tax benefit	$ 208,000	222,000	215,000
Discount offered to employees participating in the ESPP as a percentage of market price	15.00%
Share units
Stock-based Compensation Expenses
Stock-based compensation expense (benefit) before income tax benefit	$ 5,075,000	4,577,000	6,770,000
Recoupment of share units
Stock-based Compensation Expenses
Stock-based compensation expense (benefit) before income tax benefit	$ (616,000)	$ (310,000)	(130,000)
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
2000 Stock Incentive Plan | Stock options
Stock-based Compensation Expenses
Number of stock-based awards outstanding at period end (in shares)	1,073,435
Cost of sales
Stock-based Compensation Expenses
Stock-based compensation expense (benefit) before income tax benefit	$ 929,000	$ 823,000	1,047,000
Selling, general and administrative expenses
Stock-based Compensation Expenses
Stock-based compensation expense (benefit) before income tax benefit	8,091,000	7,527,000	9,336,000
Research and development expenses
Stock-based Compensation Expenses
Stock-based compensation expense (benefit) before income tax benefit	$ 963,000	$ 925,000	$ 1,044,000

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