Income Taxes (Tax Effects of Temporary Differences) (Details) - USD ($)	Jul. 31, 2025	Jul. 31, 2024
Deferred tax assets:
Inventory and warranty reserves	$ 7,026,000	$ 4,685,000
Compensation and commissions	4,414,000	3,401,000
Federal, state and foreign research and experimentation credits	18,134,000	17,559,000
Capitalized U.S. research and experimental expenditures	11,188,000	12,177,000
Stock-based compensation	1,505,000	2,409,000
Foreign scientific research and experimental development expenditures	2,006,000	1,720,000
Federal, state and foreign net operating losses	24,373,000	18,289,000
Federal and state capital losses	14,473,000	14,473,000
Lease liabilities	8,455,000	8,999,000
Deferred revenue, non-current	3,390,000	4,664,000
Interest expense limitation	13,411,000	3,423,000
Other	7,054,000	1,278,000
Less: valuation allowance	(70,973,000)	(44,888,000)
Total deferred tax assets, net	44,456,000	48,189,000
Deferred tax liabilities:
Plant and equipment	(3,379,000)	(4,781,000)
Lease right-of-use assets	(6,757,000)	(7,116,000)
Intangibles	(38,752,000)	(42,563,000)
Total deferred tax liabilities	(48,888,000)	(54,460,000)
Net deferred tax liabilities	$ (4,432,000)	$ (6,271,000)