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Stock-based Compensation (Details 1) (Restricted Stock Units [Member], USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2010
Restricted Stock Units [Member]
Summary of Restricted Stock Unit Activity
Outstanding at August 31, 2011, Number of Shares	191,757
Granted, Number of Shares	47,191
Converted to common shares	(69,044)
Forfeited, Number of Shares	0
Outstanding at August 31, 2012, Number of Shares	169,904	191,757
Vested at August 31, 2012, Number of Shares	75,430
Outstanding at August 31, 2011, Weighted-Average Grant Date Fair Value per Share	$ 34.10
Granted, Weighted-Average Grant Date Fair Value per Share	$ 39.71	$ 37.35	$ 32.14
Converted to common shares, Weighted-Average Grant Date Fair Value per Share	$ 33.16
Forfeited, Weighted-Average Grant Date Fair Value per Share	$ 0.00
Outstanding at August 31, 2012, Weighted-Average Grant Date Fair Value per Share	$ 36.03	$ 34.10
Vested at August 31, 2012, Weighted-Average Grant Date Fair Value per Share	$ 34.97
Outstanding at August 31, 2012, Aggregate Intrinsic Value	$ 8,293
Vested at August 31, 2012, Aggregate Intrinsic Value	$ 3,682

X

- Definition

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

+ References

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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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