Stock-based Compensation (Details) (Stock Options [Member], USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Aug. 31, 2012
Stock Options [Member]
Summary of Stock Option Award Activity
Outstanding at August 31, 2011, Number of Shares	520,730
Granted, Number of Shares	0
Exercised, Number of Shares	(207,463)
Forfeited or expired, Number of Shares	0
Outstanding at August 31, 2012, Number of Shares	313,267
Exercisable at August 31, 2012, Number of Shares	313,267
Outstanding at August 31, 2011, Weighted-Average Exercise Price Per Share	$ 33.43
Granted, Weighted-Average Exercise Price Per Share	$ 0.00
Exercised, Weighted-Average Exercise Price per Share	$ 33.89
Forfeited or expired, Weighted-Average Exercise Price per Share	$ 0.00
Outstanding at August 31, 2012, Weighted-Average Exercise Price Per Share	$ 33.12
Exercisable at August 31, 2012, Weighted-Average Exercise Price per Share	$ 33.12
Outstanding at August 31, 2012, Weighted average Remaining Contractual Term per Share (in years)	3 years 10 months 24 days
Exercisable at August 31, 2012, Weighted-Average Remaining Contractual Term per Share (in years)	3 years 10 months 24 days
Outstanding at August 31, 2012, Aggregate Intrinsic Value	$ 4,914
Exercisable at August 31, 2012, Aggregate Intrinsic Value	$ 4,914

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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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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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including 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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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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

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