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, 2017 $ / shares shares
Awards, outstanding beginning balance (in shares) | shares	261
Awards, granted (in shares) | shares	91
Awards, vested (in shares) | shares	(121)
Awards, forfeited (in shares) | shares	(20)
Awards, outstanding ending balance (in shares) | shares	211
Weighted-average grant-date fair value, outstanding beginning balance (in dollars per share) | $ / shares	$ 90.54
Weighted-average grant-date fair value, granted (in dollars per share) | $ / shares	154.19
Weighted-average grant-date fair value, vested (in dollars per share) | $ / shares	83.75
Weighted-average grant-date fair value, forfeited (in dollars per share) | $ / shares	109.12
Weighted-average grant-date fair value, outstanding ending balance (in dollars per share) | $ / shares	$ 119.97