Stock Compensation Plan (Schedule Of Share Based Compensation Restricted Stock Units Activity) (Details) - Restricted Stock Units (RSUs) [Member] shares in Thousands	12 Months Ended
	Jul. 31, 2020 $ / shares shares
Awards, outstanding beginning balance (in shares) | shares	126
Awards, granted (in shares) | shares	83
Awards, vested (in shares) | shares	(63)
Awards, forfeited (in shares) | shares	(16)
Awards, outstanding ending balance (in shares) | shares	130
Weighted-average grant-date fair value, outstanding beginning balance (in dollars per share) | $ / shares	$ 230.10
Weighted-average grant-date fair value, granted (in dollars per share) | $ / shares	217.46
Weighted-average grant-date fair value, vested (in dollars per share) | $ / shares	216.07
Weighted-average grant-date fair value, forfeited (in dollars per share) | $ / shares	229.97
Weighted-average grant-date fair value, outstanding ending balance (in dollars per share) | $ / shares	$ 228.77