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, 2018 $ / shares shares
Awards, outstanding beginning balance (in shares) | shares	211
Awards, granted (in shares) | shares	77
Awards, vested (in shares) | shares	(101)
Awards, forfeited (in shares) | shares	(11)
Awards, outstanding ending balance (in shares) | shares	176
Weighted-average grant-date fair value, outstanding beginning balance (in dollars per share) | $ / shares	$ 119.97
Weighted-average grant-date fair value, granted (in dollars per share) | $ / shares	215.14
Weighted-average grant-date fair value, vested (in dollars per share) | $ / shares	112.42
Weighted-average grant-date fair value, forfeited (in dollars per share) | $ / shares	159.78
Weighted-average grant-date fair value, outstanding ending balance (in dollars per share) | $ / shares	$ 163.83