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Income Taxes (Narrative) (Details) - USD ($) | Jul. 31, 2023 | Jul. 31, 2022
--- | --- | ---
Operating Loss Carryforwards [Line Items] |  |
Net deferred tax liabilities | $ 8,903,000 | $ 14,959,000
Federal, state and foreign research and experimentation credits | 19,308,000 | 19,476,000
Capital loss carryforward | 15,582,000 | 15,582,000
Valuation allowance | 34,478,000 | 31,227,000
Unrecognized tax benefits, including interest | 9,166,000 | 10,008,000
Interest accrued relating to income taxes | 210,000 | 330,000
Unrecognized tax benefits that would positively impact our effective tax rate, if recognized | 8,286,000 | 9,034,000
Reasonably possible decrease in gross unrecognized tax benefits | 622,000 |
Non-current income taxes payable |  |
Operating Loss Carryforwards [Line Items] |  |
Unrecognized tax benefits, including interest | 2,208,000 | 3,007,000
Non-current deferred tax assets |  |
Operating Loss Carryforwards [Line Items] |  |
Unrecognized tax benefits, including interest | 6,958,000 | 7,001,000
Foreign |  |
Operating Loss Carryforwards [Line Items] |  |
Net deferred tax assets | 591,000 | $ 396,000
Federal, state and foreign research and experimentation credits | 377,000 |
Operating loss carryforwards, valuation allowance | 5,799,000 |
Foreign operating loss carryforwards | 9,186,000 |
Federal |  |
Operating Loss Carryforwards [Line Items] |  |
Federal, state and foreign research and experimentation credits | 9,995,000 |
State |  |
Operating Loss Carryforwards [Line Items] |  |
Federal, state and foreign research and experimentation credits | 8,936,000 |
State and local operating loss carryforwards | 3,864,000 |
Operating loss carryforwards, valuation allowance | 3,757,000 |
State | Research and experimentation credit carryforwards |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward, valuation allowance | 8,246,000 |
State | Other |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward, valuation allowance | $ 1,094,000 |

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