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Income Taxes (Tax Effects of Temporary Differences) (Details) - USD ($) | Jul. 31, 2021 | Jul. 31, 2020
--- | --- | ---
Deferred tax assets: |  |
Inventory and warranty reserves | $ 6,774,000 | $ 5,786,000
Compensation and commissions | 4,338,000 | 3,210,000
Federal, state and foreign research and experimentation credits | 19,324,000 | 19,656,000
Stock-based compensation | 4,979,000 | 4,955,000
Foreign scientific research and experimental development expenditures | 1,496,000 | 1,765,000
Federal, state and foreign net operating losses | 5,413,000 | 3,942,000
Federal and state capital losses | 15,582,000 | 28,000
Lease liabilities | 10,980,000 | 7,335,000
Other | 4,550,000 | 6,572,000
Less: valuation allowance | (28,384,000) | (11,471,000)
Total deferred tax assets | 45,052,000 | 41,778,000
Deferred tax liabilities: |  |
Plant and equipment | (1,146,000) | (801,000)
Lease right-of-use assets | (10,085,000) | (7,080,000)
Intangibles | (54,635,000) | (50,368,000)
Total deferred tax liabilities | (65,866,000) | (58,249,000)
Net deferred tax liabilities | $ (20,814,000) | $ (16,471,000)

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