Stock Compensation Plan (Schedule Of Share Based Compensation Restricted Stock Units Activity) (Details) (Restricted Stock Units (RSUs) [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Jul. 31, 2013
Restricted Stock Units (RSUs) [Member]
Awards, outstanding beginning balance (in shares)	318
Awards, granted (in shares)	159
Awards, vested (in shares)	(134)
Awards, forfeited (in shares)	(28)
Awards, outstanding ending balance (in shares)	315
Weighted-average grant-date fair value, outstanding beginning balance (in dollars per share)	$ 37.82
Weighted-average grant-date fair value, granted (in dollars per share)	$ 52.94
Weighted-average grant-date fair value, vested (in dollars per share)	$ 37.61
Weighted-average grant-date fair value, forfeited (in dollars per share)	$ 41.16
Weighted-average grant-date fair value, outstanding ending balance (in dollars per share)	$ 45.21