Accrued Expenses and Other Current Liabilities (Product Warranty Rollforward) (Details) - USD ($)	9 Months Ended
	Apr. 30, 2024	Apr. 30, 2023
Changes in Product Warranty Liability
Balance at beginning of period	$ 8,285,000	$ 9,420,000
Provision for warranty obligations	768,000	1,756,000
Adjustments for changes in estimates	(393,000)	(1,500,000)
Charges incurred	(1,250,000)	(1,436,000)
PST Divestiture	(418,000)	0
Balance at end of period	$ 6,992,000	$ 8,240,000