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Stock-based Compensation (Performance Share Units) (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Income tax benefit (expense) from stock-based award	$ 891,000	$ 709,000	$ 1,365,000
Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Number of Shares	41,180
Granted, Number of Shares
Converted to common shares, Number of Shares	(11,520)
Forfeited, Number of Shares	(12,480)
Outstanding, Number of Shares	17,180	41,180
Expected to vest, Number of Shares	13,315
Outstanding, Weighted-Average Exercise Price	$ 38.02
Granted, Weighted-Average Exercise Price		$ 39.61	$ 36.88
Converted to common shares, Weighted-Average Exercise Price	$ 36.88
Forfeited, Weighted-Average Exercise Price	$ 36.88
Outstanding, Weighted-Average Exercise Price	$ 39.61	$ 38.02
Expected to vest, Weighted-Average Exercise Price	$ 39.61
Outstanding, Aggregate Intrinsic Value	1,000,000
Expected to vest, Aggregate Intrinsic Value	775,000
Income tax benefit (expense) from stock-based award	200,000	200,000
Intrinsic value of stock-based awards converted into common shares	$ 600,000	$ 600,000
Minimum [Member] | Performance 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] | Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of original target number of vested shares	150.00%

X

- Definition

Adjustment to additional paid in capital related to the net effect of excess tax benefits and tax deficiencies associated with an equity-based compensation plan other than an employee stock ownership plan (ESOP).

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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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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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The total fair value of equity-based awards 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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Percentage of vesting of share-based compensation awards.

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

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