Stock Compensation Plan (Schedule Of Share Based Compensation Valuation Model) (Details)	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	42.60%	42.80%	42.50%
Expected dividends	1.50%	0.00%	0.00%
Expected term (average in years)			4 years 7 months 7 days
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (average in years)	5 years 11 months 20 days	5 years 26 days
Risk-free rate, minimum	0.20%	0.10%	0.30%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (average in years)	6 years 2 months 21 days	5 years 3 months 26 days
Risk-free rate, maximum	1.60%	2.20%	2.80%