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, 2016 $ / shares shares
Awards, outstanding beginning balance (in shares) | shares	271
Awards, granted (in shares) | shares	142
Awards, vested (in shares) | shares	134
Awards, forfeited (in shares) | shares	18
Awards, outstanding ending balance (in shares) | shares	261
Weighted-average grant-date fair value, outstanding beginning balance (in dollars per share) | $ / shares	$ 72.10
Weighted-average grant-date fair value, granted (in dollars per share) | $ / shares	102.20
Weighted-average grant-date fair value, vested (in dollars per share) | $ / shares	66.69
Weighted-average grant-date fair value, forfeited (in dollars per share) | $ / shares	85.79
Weighted-average grant-date fair value, outstanding ending balance (in dollars per share) | $ / shares	$ 90.54