Net Earnings Per Share (Schedule Of Information Necessary To Calculate Basic And Diluted Net Earnings Per Common Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013
Net Earnings Per Share [Abstract]
Weighted average shares - basic	145,310,710	148,136,620	146,543,727	148,404,503
Common share equivalents	2,028,000	2,097,000	2,065,000	2,186,000
Weighted average shares - diluted	147,339,425	150,234,445	148,608,748	150,591,003
Net earnings for basic and diluted earnings per share computation	$ 67,336	$ 69,842	$ 187,268	$ 174,768
Net earnings per share - basic	$ 0.46	$ 0.47	$ 1.28	$ 1.18
Net earnings per share - diluted	$ 0.46	$ 0.46	$ 1.26	$ 1.16