Stock Compensation Plan (Schedule Of Share Based Compensation Valuation Model) (Details)	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	40.40%	40.60%	41.20%
Expected dividends	2.20%	1.90%	1.20%
Risk-free rate, minimum	0.30%	0.10%	0.10%
Risk-free rate, maximum	2.20%	2.60%	2.80%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (average in years)	5 years 4 months	4 years 11 months	5 years 6 months
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (average in years)	5 years 11 months	5 years 7 months	5 years 10 months 23 days