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