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Stock-based Compensation (Schedule Of Deferred Performance Share Units) (Details) - Deferred Performance Units [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Number of Shares	23,530
Granted, Number of Shares	18,955
Performance factor adjustment, Number of Shares	(19,357)
Converted to common shares, Number of Shares
Forfeited, Number of Shares	(214)
Outstanding, Number of Shares	22,914	23,530
Vested, Number of Shares	4,173
Outstanding, Weighted-Average Grant Date Fair Value Per Share	$ 148.70
Granted, Weighted-Average Grant Date Fair Value Per Share	183.62	$ 160.37	$ 110.65
Performance factor adjustment, Weighted-Average Grant Date Fair Value Per Share	160.37
Converted to common shares, Weighted-Average Grant Date Fair Value Per Share
Forfeited, Weighted-Average Grant Date Fair Value Per Share	183.62
Outstanding, Weighted-Average Grant Date Fair Value Per Share	167.40	$ 148.70
Vested, Weighted-Average Grant Date Fair Value Per Share	$ 94.54
Outstanding, Aggregate Intrinsic Value	$ 4,683
Vested, Aggregate Intrinsic Value	$ 853

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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