Stock Compensation Plan (Schedule Of Share Based Compensation Valuation Model) (Details)	12 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	40.00%	40.31%	40.40%
Expected dividends	1.98%	2.24%	2.20%
Risk-free rate, minimum	1.20%	0.50%	0.30%
Risk-free rate, maximum	2.30%	1.50%	2.20%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (average in years)	5 years 10 months	5 years 6 months	5 years 4 months
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (average in years)	6 years 5 months	6 years 2 months	5 years 11 months