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, 2013	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012
Net Earnings Per Share [Abstract]
Weighted average shares - basic	148,136,620	150,536,631	148,404,503	150,385,389
Common share equivalents	2,097,000	2,670,000	2,186,000	2,682,000
Weighted average shares - diluted	150,234,445	153,207,471	150,591,003	153,067,148
Net earnings for basic and diluted earnings per share computation	$ 69,842	$ 70,946	$ 174,768	$ 193,320
Net earnings per share - basic	$ 0.47	$ 0.47	$ 1.18	$ 1.29
Net earnings per share - diluted	$ 0.46	$ 0.46	$ 1.16	$ 1.26