Accrued Expenses and Other Current Liabilities (Product Warranty Rollforward) (Details) - USD ($)	12 Months Ended
	Jul. 31, 2023	Jul. 31, 2022
Changes in Product Warranty Liability
Balance at beginning of year	$ 9,420,000	$ 17,600,000
Provision for (benefit from) warranty obligations	3,158,000	(1,255,000)
Adjustments for changes in estimates	(2,300,000)	(2,500,000)
Charges incurred	(1,993,000)	(4,425,000)
Balance at end of year	$ 8,285,000	$ 9,420,000