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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, 2017	Aug. 31, 2016	Aug. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Income tax benefit (expense) from stock-based award	$ 1,539	$ 2,064	$ 1,208
Market Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Number of Shares	45,700
Granted, Number of Shares	14,683
Performance factor adjustment, Number of Shares	10,974
Converted to common shares, Number of Shares	(25,825)		0
Forfeited, Number of Shares	(613)
Outstanding, Number of Shares	44,919	45,700
Outstanding, Weighted-Average Grant Date Fair Value Per Share	$ 87.82
Granted, Weighted-Average Grant Date Fair Value Per Share	90.91	$ 120.99	$ 71.66
Performance factor adjustment, Weighted-Average Grant Date Fair Value Per Share	73.44
Converted to common shares, Weighted-Average Grant Date Fair Value Per Share	71.20
Forfeited, Weighted-Average Grant Date Fair Value Per Share	82.51
Outstanding, Weighted-Average Grant Date Fair Value Per Share	$ 94.95	$ 87.82
Outstanding, Aggregate Intrinsic Value	$ 4,894
Expected volatility	21.10%	22.20%	22.00%
Risk-free interest rate	1.00%	0.90%	0.80%
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 17 days
Total intrinsic value of stock-based awards converted into common shares	$ 2,800	$ 3,700
Income tax benefit (expense) from stock-based award	$ 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%

X

- Definition

Amount of increase (decrease) in additional paid in capital (APIC) resulting from a tax benefit (deficiency) associated with an share-based compensation plan other than an employee stock ownership plan (ESOP).

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

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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- Definition

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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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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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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- Definition

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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- Definition

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

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

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Percentage of vesting of share-based compensation awards.

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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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