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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, 2019 | Jul. 31, 2018 | Jul. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |
Unrecognized Tax Benefits, Income Tax Penalties Expense |  | $ 2,357 | $ 83 | $ 218
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract] |  |  |  |
Tax at statutory rate |  | 21.00% | 26.90% | 35.00%
State income taxes, net of federal tax benefit | [1] | 0.30% | 1.60% | 1.00%
International rate differential |  | 2.20% | (1.10%) | (6.30%)
Rate variances arising from foreign subsidiary distributions(1) |  | (0.40%) | 0.80% | (5.90%)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent |  | 1.80% | 14.10% | 0.00%
Effective Income Tax Rate Reconciliation, Disposition of Business, Percent |  | 0.00% | (0.80%) | 0.00%
Effective Income Tax Rate Reconciliation, Tax Contingency, Percent | [2] | (3.60%) | 2.20% | 3.60%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent |  | 2.30% | 0.50% | 0.00%
Research and development tax credits and domestic manufacturer’s deduction |  | (1.60%) | (2.00%) | (1.80%)
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent |  | (1.70%) | (2.10%) | (1.10%)
Effective tax rate |  | 20.30% | 40.10% | 24.50%
[1] | The year ended July 31, 2018, includes the establishment of a valuation allowance against foreign tax credit carryforwards as a result of the Tax Reform Act.
[2] | The year ended July 31, 2018, includes the divestiture of the Company's Runelandhs business based in Sweden. Refer to Note 14, "Divestiture" for additional information.

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