Shareholders' Equity (Schedule Of Treasury Stock) (Details)	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010
Noncontrolling Interest [Line Items]
Balance at beginning of year	13,245,864
Net issuance upon exercise of stock options	(1,379,827)	(2,243,502)	(1,697,980)
Balance at end of year	3,980,832	13,245,864
Treasury Stock [Member]
Noncontrolling Interest [Line Items]
Balance at beginning of year	13,245,864	12,222,381
Stock repurchases	4,503,587	1,956,648
Net issuance upon exercise of stock options	(1,270,526)	(862,981)
Issuance under compensation plans	(89,528)	(62,304)
Stock split and other activity	(12,408,565)	(7,880)
Balance at end of year	3,980,832	13,245,864