Net Earnings Per Share (Schedule Of Information Necessary To Calculate Basic And Diluted Net Earnings Per Common Share) (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	3 Months Ended		6 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2016	Jan. 31, 2015
Earnings Per Share [Abstract]
Weighted average shares - basic (in shares)	133.7	138.0	133.8	138.8
Common share equivalents (in shares)	0.7	1.7	0.9	1.8
Weighted average shares - diluted (in shares)	134.4	139.7	134.7	140.6
Net earnings for basic and diluted earnings per share computation	$ 38,000	$ 48,000	$ 76,500	$ 103,900
Net earnings per share - basic (in usd per share)	$ 0.28	$ 0.35	$ 0.57	$ 0.75
Net earnings per share - diluted (in usd per share)	$ 0.28	$ 0.34	$ 0.57	$ 0.74