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Income Taxes (Tax Effects of Temporary Differences) (Details) - USD ($) | Jul. 31, 2024 | Jul. 31, 2023
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Deferred tax assets: |  |
Inventory and warranty reserves | $ 4,685,000 | $ 6,147,000
Compensation and commissions | 3,401,000 | 3,221,000
Federal, state and foreign research and experimentation credits | 17,559,000 | 19,308,000
Capitalized U.S. research and experimental expenditures | 12,177,000 | 8,784,000
Stock-based compensation | 2,409,000 | 4,774,000
Foreign scientific research and experimental development expenditures | 1,720,000 | 2,118,000
Federal, state and foreign net operating losses | 18,289,000 | 13,011,000
Federal and state capital losses | 14,473,000 | 15,582,000
Lease liabilities | 8,999,000 | 11,986,000
Deferred revenue, non-current | 4,664,000 | 4,463,000
163(j) Interest Expense Limitation | 3,423,000 | 549,000
Other | 1,278,000 | 1,868,000
Less: valuation allowance | (44,888,000) | (34,478,000)
Total deferred tax assets | 48,189,000 | 57,333,000
Deferred tax liabilities: |  |
Plant and equipment | (4,781,000) | (4,883,000)
Lease right-of-use assets | (7,116,000) | (10,510,000)
Intangibles | (42,563,000) | (50,843,000)
Total deferred tax liabilities | (54,460,000) | (66,236,000)
Net deferred tax liabilities | $ (6,271,000) | $ (8,903,000)

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