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Stock-based Compensation (Stock Options) (Details) (USD $)	12 Months Ended
	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Income tax benefit (expense) from stock-based award	$ 839,000	$ 891,000	$ 709,000
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Number of Shares	168,591
Exercised, Number of Shares	(38,526)
Outstanding, Number of Shares	130,065	168,591
Exercisable, Number of Shares	130,065
Outstanding, Weighted-Average Exercise Price	$ 33.13
Exercised, Weighted-Average Exercise Price	$ 33.33
Outstanding, Weighted-Average Exercise Price	$ 33.07	$ 33.13
Exercisable, Weighted-Average Exercise Price	$ 33.07
Outstanding, Weighted-Average Remaining Contractual Term	2 years 2 months 12 days
Exercisable, Weighted-Average Remaining Contractual Term	2 years 2 months 12 days
Outstanding, Aggregate Intrinsic Value	4,634,000
Exercisable, Aggregate Intrinsic Value	4,634,000
Income tax benefit (expense) from stock-based award	400,000	900,000	700,000
Total intrinsic value of stock options exercised	$ 1,400,000	$ 3,200,000	$ 2,800,000

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

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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-Publisher FASB

-Name Accounting Standards Codification

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Number of share options (or share units) exercised during the current period.

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