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
	Oct. 31, 2014	Oct. 31, 2013
Net Earnings Per Share [Abstract]
Weighted average shares - basic	139,581,380	147,323,138
Common share equivalents	1,899,000	2,038,000
Weighted average shares - diluted	141,480,267	149,360,875
Net earnings for basic and diluted earnings per share computation	$ 55,947	$ 61,592
Net earnings per share - basic	$ 0.40	$ 0.42
Net earnings per share - diluted	$ 0.40	$ 0.41