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Income Taxes (Tax Effects of Temporary Differences) (Details) - USD ($) | Jul. 31, 2025 | Jul. 31, 2024
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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)

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