Income Taxes (Reconciliation Of Effective Income Tax Rate And Effective Rate From Continuing Operation) (Details)	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Income Tax Disclosure [Abstract]
At U.S. Federal income tax rate	35.00%	35.00%	35.00%
State income tax, net of Federal benefit	3.20%	3.40%	3.30%
Nondeductible meals or entertainment	0.20%	0.70%	0.40%
General business credits	(0.50%)	(1.70%)	(1.20%)
Effective Income Tax Rate Reconciliation, Tax Settlement, Other, Amount	(16.00%)	0.00%	0.00%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	0.50%	0.00%	0.00%
Effective Income Tax Rate Reconciliation, Domestic Production Deduction	(0.70%)	(1.40%)	(1.20%)
Other	1.50%	0.00%	0.20%
Effective income tax rate	23.20%	36.00%	36.50%