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Stock-based Compensation (Schedule Of Restricted Stock 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
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Number of Shares	116,770
Granted, Number of Shares	24,114
Converted to common shares, Number of Shares	(24,471)
Forfeited, Number of Shares	(1,105)
Outstanding, Number of Shares	115,308	116,770
Vested, Number of Shares	87,309
Outstanding, Weighted-Average Grant Date Fair Value Per Share	$ 63.61
Granted, Weighted-Average Grant Date Fair Value Per Share	111.71	$ 109.23	$ 95.89
Converted to common shares, Weighted-Average Grant Date Fair Value Per Share	76.58
Forfeited, Weighted-Average Grant Date Fair Value Per Share	104.24
Outstanding, Weighted-Average Grant Date Fair Value Per Share	70.52	$ 63.61
Vested, Weighted-Average Grant Date Fair Value Per Share	$ 59.22
Outstanding, Aggregate Intrinsic Value	$ 20,461
Vested, Aggregate Intrinsic Value	15,493
Total intrinsic value of stock-based awards converted into common shares	2,800	$ 3,600	$ 2,800
Income tax benefit (expense) from stock-based award	$ 700	$ 1,300	$ 1,000

X

- 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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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).

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The weighted average fair value at grant date for nonvested equity-based awards issued 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).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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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 weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options.

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Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.

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