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Income Taxes (Narrative) (Details) - USD ($) | Jul. 31, 2025 | Jul. 31, 2024
--- | --- | ---
Operating Loss Carryforwards [Line Items] |  |
Net deferred tax liabilities | $ 4,432,000 | $ 6,271,000
Federal, state and foreign research and experimentation credits | 18,134,000 | 17,559,000
Capital loss carryforward | 14,473,000 | 14,473,000
Valuation allowance | 70,973,000 | 44,888,000
Unrecognized tax benefits, including interest | 8,084,000 | 8,605,000
Interest accrued relating to income taxes | 240,000 | 224,000
Unrecognized tax benefits that would positively impact our effective tax rate, if recognized | 7,180,000 | 7,679,000
Reasonably possible decrease in gross unrecognized tax benefits | 196,000 |
Increased bonus deduction | 1,254,000 |
Non-current income taxes payable |  |
Operating Loss Carryforwards [Line Items] |  |
Unrecognized tax benefits, including interest | 1,818,000 | 2,231,000
Non-current deferred tax assets |  |
Operating Loss Carryforwards [Line Items] |  |
Unrecognized tax benefits, including interest | 6,266,000 | 6,374,000
Foreign |  |
Operating Loss Carryforwards [Line Items] |  |
Net deferred tax assets | 187,000 | $ 78,000
Federal, state and foreign research and experimentation credits | 489,000 |
Operating loss carryforwards, valuation allowance | 20,829,000 |
Foreign operating loss carryforwards | 19,513,000 |
Federal |  |
Operating Loss Carryforwards [Line Items] |  |
Federal, state and foreign research and experimentation credits | 8,447,000 |
Operating loss carryforwards | 962,000 |
Valuation allowance | 13,456,000 |
State |  |
Operating Loss Carryforwards [Line Items] |  |
Federal, state and foreign research and experimentation credits | 9,048,000 |
Operating loss carryforwards | 3,758,000 |
Operating loss carryforwards, valuation allowance | 4,720,000 |
Valuation allowance | 13,456,000 |
State | Research and experimentation credit carryforwards |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward, valuation allowance | $ 17,495,000 |

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