Income Taxes (Reconciliation Of Effective Income Tax Rate And Effective Rate From Continuing Operation) (Details)	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Income Tax Disclosure [Abstract]
At U.S. Federal income tax rate	35.00%	35.00%	35.00%
State income tax, net of Federal benefit	2.20%	3.10%	3.20%
Effective Income Tax Rate Reconciliation, Tax Settlement, Other, Amount	0.00%	0.00%	(16.00%)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	0.90%	0.10%	0.50%
Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent	(2.10%)	0.00%	0.00%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent	(1.80%)	(0.20%)	0.00%
Other	(0.70%)	0.40%	0.50%
Effective income tax rate	33.50%	38.40%	23.20%