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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, 2019		Aug. 31, 2018	Aug. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Number of Shares		42,208
Granted, Number of Shares		11,687
Performance factor adjustment, Number of Shares		11,090
Converted to common shares, Number of Shares		(24,752)
Forfeited, Number of Shares		(709)
Outstanding, Number of Shares		39,524	[1]	42,208
Outstanding, Weighted-Average Grant Date Fair Value Per Share		$ 105.81
Granted, Weighted-Average Grant Date Fair Value Per Share		177.82		$ 101.93	$ 90.91
Performance factor adjustment, Weighted-Average Grant Date Fair Value Per Share		127.80
Converted to common shares, Weighted-Average Grant Date Fair Value Per Share		125.28
Forfeited, Weighted-Average Grant Date Fair Value Per Share		108.29
Outstanding, Weighted-Average Grant Date Fair Value Per Share		$ 121.03	[1]	$ 105.81
Outstanding, Aggregate Intrinsic Value	[1]	$ 7,205
Expected volatility		19.60%		20.40%	21.10%
Risk-free interest rate		3.00%		1.60%	1.00%
Expected dividend yield		0.00%		0.00%	0.00%
[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.

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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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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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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Increase in the number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan) for performance factor adjustments.

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