Income Taxes (Schedule Of Reconciliation Of U.S. Statutory Income Tax Rate With Effective Income Tax Rate) (Details)	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Income Tax Disclosure [Abstract]
Statutory U.S. federal rate	35.00%	35.00%	35.00%
State income taxes	1.00%	1.10%	1.20%
Foreign operations	(7.60%)	(6.10%)	(6.30%)
Export, manufacturing and research credits	(1.20%)	(0.80%)	(1.50%)
Change in unrecognized tax benefits	1.30%	(1.10%)	0.50%
Other	(0.60%)	(0.20%)	0.10%
Reconciliation of U.S. statutory income tax rate, total	27.90%	27.90%	29.00%