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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, 2015
$ / shares
shares
Awards, outstanding beginning balance (in shares) | shares 274
Awards, granted (in shares) | shares 143
Awards, vested (in shares) | shares (113)
Awards, forfeited (in shares) | shares (33)
Awards, outstanding ending balance (in shares) | shares 271
Weighted-average grant-date fair value, outstanding beginning balance (in dollars per share) $ 58.68
Weighted-average grant-date fair value, granted (in dollars per share) 83.50
Weighted-average grant-date fair value, vested (in dollars per share) 54.38
Weighted-average grant-date fair value, forfeited (in dollars per share) 70.91
Weighted-average grant-date fair value, outstanding ending balance (in dollars per share) $ 72.10