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Income Taxes (Narrative) (Details) - USD ($)	Jul. 31, 2021	Jul. 31, 2020
Operating Loss Carryforwards [Line Items]
Net deferred tax liabilities	$ 20,814,000	$ 16,471,000
Federal, state and foreign research and experimentation credits	19,324,000	19,656,000
Capital loss carryforward	15,582,000	28,000
Valuation allowance	28,384,000	11,471,000
Minimum taxable income in the future to fully utilize net deferred tax assets	193,800,000
Unrecognized tax benefits, including interest	9,172,000	8,345,000
Interest accrued relating to income taxes	163,000	75,000
Unrecognized tax benefits that would positively impact our effective tax rate, if recognized	8,408,000	7,700,000
Capital Loss
Operating Loss Carryforwards [Line Items]
Valuation allowance	15,582,000
Non-current income taxes payable
Operating Loss Carryforwards [Line Items]
Unrecognized tax benefits, including interest	2,717,000	1,963,000
Non-current deferred tax assets
Operating Loss Carryforwards [Line Items]
Unrecognized tax benefits, including interest	6,455,000	6,382,000
Foreign
Operating Loss Carryforwards [Line Items]
Net deferred tax assets	416,000	$ 1,166,000
Federal, state and foreign research and experimentation credits	1,814,000
Operating loss carryforwards, valuation allowance	656,000
Foreign operating loss carryforwards	2,116,000
Federal
Operating Loss Carryforwards [Line Items]
Federal, state and foreign research and experimentation credits	9,471,000
State
Operating Loss Carryforwards [Line Items]
Federal, state and foreign research and experimentation credits	8,038,000
State and local operating loss carryforwards	3,267,000
Operating loss carryforwards, valuation allowance	3,178,000
Tax credit carryforward, valuation allowance	$ 7,451,000

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