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Stock-based Compensation (Schedule Of Market Share Units Activity) (Details) - Market Share 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		39,524
Granted, Number of Shares		13,452
Performance factor adjustment, Number of Shares		10,561
Converted to common shares, Number of Shares		(24,171)
Forfeited, Number of Shares		(248)
Outstanding, Number of Shares		39,118	[1]	39,524
Outstanding, Weighted-Average Grant Date Fair Value Per Share		$ 121.03
Granted, Weighted-Average Grant Date Fair Value Per Share		216.77		$ 177.82	$ 101.93
Performance factor adjustment, Weighted-Average Grant Date Fair Value Per Share		96.10
Converted to common shares, Weighted-Average Grant Date Fair Value Per Share		93.69
Forfeited, Weighted-Average Grant Date Fair Value Per Share		118.47
Outstanding, Weighted-Average Grant Date Fair Value Per Share		$ 164.14	[1]	$ 121.03
Outstanding, Aggregate Intrinsic Value	[1]	$ 7,995
Percent of original target number of vested shares		100.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of original target number of vested shares		200.00%
[1] This figure represents the total number of shares underlying MSU grants assuming achievement of the target number of shares at 100%. As the ultimate number of shares that vest could be as high as 200% of the target, the Company may be required to issue additional shares to satisfy outstanding MSU award grants.

X

- Definition

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

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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