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Income Taxes (Reconciliation Of Effective Income Tax Rate And Effective Rate From Continuing Operation) (Details)	12 Months Ended
	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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