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Stock-based Compensation (Market Share Units) (Details) - Market Share Units [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Number of Shares	57,604
Granted, Number of Shares	15,590
Performance factor adjustment, Number of Shares	17,098
Converted to common shares, Number of Shares	(40,077)	0	0
Forfeited, Number of Shares	(4,515)
Outstanding, Number of Shares	45,700	57,604
Outstanding, Weighted-Average Grant Date Fair Value Per Share	$ 57.37
Granted, Weighted-Average Grant Date Fair Value Per Share	120.99	$ 71.66	$ 69.58
Performance factor adjustment, Weighted-Average Grant Date Fair Value Per Share	39.26
Converted to common shares, Weighted-Average Grant Date Fair Value Per Share	38.17
Forfeited, Weighted-Average Grant Date Fair Value Per Share	70.58
Outstanding, Weighted-Average Grant Date Fair Value Per Share	$ 87.82	$ 57.37
Outstanding, Aggregate Intrinsic Value	$ 5,409
Expected volatility	22.20%	22.00%	25.20%
Risk-free interest rate	0.90%	0.80%	0.60%
Expected dividend yield	0.00%	0.00%	0.00%
Expected volatility period	2 years 10 months 21 days	2 years 10 months 17 days	2 years 10 months 17 days
Total intrinsic value of stock-based awards converted into common shares	$ 3,700
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of original target number of vested shares	0.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of original target number of vested shares	200.00%

X

- 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=6415400&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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-Subparagraph (c)(2)(iii)(3)
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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).

+ References

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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.

+ References

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-Publisher FASB
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Name Accounting Standards Codification
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- Definition

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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X

- 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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-Publisher FASB
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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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-Name Accounting Standards Codification
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

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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