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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jul. 31, 2020 | Jul. 31, 2019 | Jul. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |
Unrecognized Tax Benefits, Income Tax Penalties Expense |  | $ 96 | $ 2,357 | $ 83
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract] |  |  |  |
Tax at statutory rate |  | 21.00% | 21.00% | 26.90%
State income taxes, net of federal tax benefit | [1] | 1.00% | 0.30% | 1.60%
International rate differential(1) |  | 5.10% | 2.20% | (1.10%)
Rate variances arising from foreign subsidiary distributions |  | 0.20% | (0.40%) | 0.80%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent |  | (1.40%) | 1.80% | 14.10%
Effective Income Tax Rate Reconciliation, Disposition of Business, Percent |  | 0.00% | 0.00% | (0.80%)
Effective Income Tax Rate Reconciliation, Tax Contingency, Percent | [2] | (2.00%) | (3.60%) | 2.20%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent |  | 0.50% | 2.30% | 0.50%
Research and development tax credits and domestic manufacturer’s deduction |  | (2.00%) | (1.60%) | (2.00%)
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent |  | (2.30%) | (1.70%) | (2.10%)
Income tax rate |  | 20.10% | 20.30% | 40.10%
[1] | T
[2] | he year ended July 31, 2018, includes the divestiture of the Company's Runelandhs business based in Sweden. Refer to Note 15, "Divestiture" for additional information.

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