Stock Compensation Plan (Schedule Of Share Based Compensation Valuation Model) (Details)	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	38.60%	40.00%	40.31%
Expected dividends	2.10%	1.98%	2.24%
Risk-free rate, minimum	2.40%	1.20%	0.50%
Risk-free rate, maximum	2.90%	2.30%	1.50%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (average in years)	6 years	5 years 10 months	5 years 6 months
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (average in years)	6 years 7 months	6 years 5 months	6 years 2 months