Income Taxes (Reconciliation Of Effective Income Tax Rate And Effective Rate From Continuing Operation) (Details)	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Income Tax Disclosure [Abstract]
At U.S. Federal income tax rate	35.00%	35.00%	35.00%
State income tax, net of Federal benefit	3.40%	3.30%	3.10%
Nondeductible meals or entertainment	0.70%	0.40%	0.70%
General business credits	(1.70%)	(1.20%)	(2.30%)
Nondeductible compensation	0.00%	0.00%	2.20%
Effective Income Tax Rate Reconciliation, Domestic Production Deduction	(1.40%)	(1.20%)	0.00%
Other	0.00%	0.20%	0.80%
Effective income tax rate	36.00%	36.50%	39.50%