Shareholders' Equity (Schedule of Treasury Stock) (Details) - shares	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Schedule of Treasury Shares Activity [Roll Forward]
Beginning balance (in shares)	24,324,483
Net issuance upon exercise of stock options (in shares)	(845,086)	(1,103,054)	(738,635)
Ending balance (in shares)	25,304,515	24,324,483
Treasury Stock
Schedule of Treasury Shares Activity [Roll Forward]
Beginning balance (in shares)	24,324,483	22,871,145
Stock repurchases (in shares)	2,030,545	2,636,554
Net issuance upon exercise of stock options (in shares)	(833,168)	(1,057,604)
Issuance under compensation plans (in shares)	(198,120)	(104,483)
Other activity (in shares)	(19,225)	(21,129)
Ending balance (in shares)	25,304,515	24,324,483	22,871,145