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		6 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013
Net Earnings Per Share [Abstract]
Weighted average shares - basic	146,957,131	147,951,535	147,140,135	148,531,306
Common share equivalents	2,065,000	2,037,000	2,064,000	2,211,000
Weighted average shares - diluted	149,021,755	149,988,832	149,204,090	150,742,467
Net earnings for basic and diluted earnings per share computation	$ 58,340	$ 50,813	$ 119,932	$ 104,926
Net earnings per share - basic	$ 0.40	$ 0.34	$ 0.82	$ 0.71
Net earnings per share - diluted	$ 0.39	$ 0.34	$ 0.80	$ 0.70