Stock Compensation Plan (Schedule Of Share Based Compensation Valuation Model) (Details)	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	42.80%	42.50%	43.30%
Expected dividends	1.50%	0.00%	0.00%
Expected term (average in years)		4 years 7 months 7 days	4 years 8 months 12 days
Risk-free rate, minimum	0.10%	0.30%	0.40%
Risk-free rate, maximum	4.20%	4.50%	4.60%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (average in years)	5 years 26 days
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (average in years)	5 years 3 months 26 days