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Stock-based Compensation (Restricted Stock 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
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Number of Shares	169,904
Granted, Number of Shares	34,576
Converted to common shares, Number of Shares	(51,052)
Forfeited, Number of Shares	(1,700)
Outstanding, Number of Shares	151,728	169,904
Vested, Number of Shares	85,613
Outstanding, Weighted-Average Exercise Price	$ 36.03
Granted, Weighted-Average Exercise Price	$ 45.45	$ 39.71	$ 37.35
Converted to common shares, Weighted-Average Exercise Price	$ 35.73
Forfeited, Weighted-Average Exercise Price	$ 38.67
Outstanding, Weighted-Average Exercise Price	$ 38.25	$ 36.03
Vested, Weighted-Average Exercise Price	$ 36.45
Outstanding, Aggregate Intrinsic Value	8,828,000
Vested, Aggregate Intrinsic Value	4,981,000
Income tax benefit (expense) from stock-based award	800,000	900,000	500,000
Intrinsic value of stock-based awards converted into common shares	$ 2,400,000	$ 3,100,000	$ 1,900,000

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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 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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