Stock-Based Compensation (Schedule Of Stock Option Activity) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Jul. 31, 2011
Stock-Based Compensation
Beginning of year, Options	12,473
Granted, Options
Exercised, Options	(3,737)
Terminated, Options	(30)
End of year, Options	8,706
Exercisable at end of year, Options	8,706
Beginning of year, Weighted-Average Exercise Price	$ 26.47
Granted, Weighted-Average Exercise Price
Exercised, Weighted-Average Exercise Price	$ 26.97
Terminated, Weighted-Average Exercise Price	$ 33.82
End of year, Weighted-Average Exercise Price	$ 26.23
Exercisable at end of year, Weighted-Average Exercise Price	$ 26.23
Outstanding at end of year, Weighted-Average Remaining Contractual Life (in years)	2.2
Exercisable at end of year, Weighted-Average Remaining Contractual Life (in years)	2.2
Outstanding at end of year, Aggregate Intrinsic Value	$ 59
Exercisable at end of year, Aggregate Intrinsic Value	$ 59