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Income Taxes (Reconciliation Of Effective Income Tax Rate And Effective Rate From Continuing Operation) (Details) | 12 Months Ended
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Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
At U.S. federal income tax rate | 21.00% | 26.80% | 35.00%
State income tax, net of federal benefit | 2.80% | 3.00% | 2.20%
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent | (1.60%) |  |
Change in valuation allowance | 0.00% | 0.30% | 0.90%
Excess tax benefits related to stock-based compensation | (3.00%) | (20.90%) |
Impacts of the Tax Act | 0.00% | (24.70%) |
Noncontrolling interests | (1.50%) | (1.70%) | (2.10%)
Foreign rate differential | 0.40% | (1.50%) | (3.40%)
Other | 0.80% | 0.70% | 0.90%
Effective tax rate | 18.90% | (18.00%) | 33.50%

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