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Stock-based Compensation (Schedule Of Market Share Units Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Aug. 31, 2018		Aug. 31, 2017	Aug. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Income tax benefit (expense) from stock-based award		$ 1,100		$ 1,400	$ 1,200
Market Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Number of Shares		44,919
Granted, Number of Shares		15,729
Performance factor adjustment, Number of Shares		12,194
Converted to common shares, Number of Shares		(27,589)
Forfeited, Number of Shares		(3,045)
Outstanding, Number of Shares		42,208	[1]	44,919
Outstanding, Weighted-Average Grant Date Fair Value Per Share		$ 94.95
Granted, Weighted-Average Grant Date Fair Value Per Share		101.93		$ 90.91	$ 120.99
Performance factor adjustment, Weighted-Average Grant Date Fair Value Per Share		76.04
Converted to common shares, Weighted-Average Grant Date Fair Value Per Share		74.30
Forfeited, Weighted-Average Grant Date Fair Value Per Share		91.87
Outstanding, Weighted-Average Grant Date Fair Value Per Share		$ 105.81	[1]	$ 94.95
Outstanding, Aggregate Intrinsic Value	[1]	$ 7,490
Expected volatility		20.40%		21.10%	22.20%
Risk-free interest rate		1.60%		1.00%	0.90%
Expected dividend yield		0.00%		0.00%	0.00%
Expected volatility period		2 years 10 months 21 days		2 years 10 months 21 days	2 years 10 months 21 days
Total intrinsic value of stock-based awards converted into common shares		$ 3,000		$ 2,800	$ 3,700
Income tax benefit (expense) from stock-based award		$ 800		$ 900	$ 1,200
Minimum [Member] | Market Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of original target number of vested shares		0.00%
Maximum [Member] | Market Share Units [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.

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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