Shareholders' Equity (Schedule Of Treasury Stock) (Details)	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2011
Noncontrolling Interest [Line Items]
Balance at beginning of year	3,980,832
Net issuance upon exercise of stock options	(1,607,081)	(1,379,827)	(2,243,502)
Balance at end of year	5,490,725	3,980,832
Treasury Stock [Member]
Noncontrolling Interest [Line Items]
Balance at beginning of year	3,980,832	13,245,864
Stock repurchases	2,986,794	4,503,587
Net issuance upon exercise of stock options	(1,288,560)	(1,270,526)
Issuance under compensation plans	(174,408)	(89,528)
Stock split and other activity	(13,933)	(12,408,565)
Balance at end of year	5,490,725	3,980,832