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Share Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified							12 Months Ended
	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2014 Restricted Stock Units Settled In Cash [Member]	Aug. 31, 2013 Restricted Stock Units Settled In Cash [Member]	Aug. 31, 2012 Restricted Stock Units Settled In Cash [Member]	Aug. 31, 2014 Performance Shares [Member]	Aug. 31, 2014 Restricted Stock Units [Member]	Aug. 31, 2013 Restricted Stock Units [Member]	Aug. 31, 2014 Common Class [Member] Performance Shares [Member]	Aug. 31, 2013 Common Class [Member] Performance Shares [Member]	Aug. 31, 2014 2010 Plan [Member] item	Aug. 31, 2014 2010 Plan [Member] Stock Options [Member]	Aug. 31, 2014 Non Employee Directors [Member] Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares authorized												435,000
Number of shares available												153,929
Stock award ratio												1
Plan effective date												Jan. 25, 2010
Stock option expire, years													10 years
Vesting period							3 years	3 years					4 years	9 months
Percentage vested per year								33.00%					25.00%
Outstanding stock options vested	13,793	8,330								46,908	56,944
Shares outstanding	86,623	79,138	146,298	5,289	4,496	4,873
Fair value vested								$ 2.1	$ 1.9	$ 2.6	$ 1.9
Pre-tax total unrecognized compensation cost related to nonvested share-based compensation	$ 5.1
Weighted average period to be recognized							1 year 8 months 12 days

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Employee Service Share-Based Compensation Novested Awards Total Compensation Cost Unrecognized Weighted Average Period

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Share Based Compensation Award Ratio

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Share Based Compensation Program Effective Date

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Share Based Compensation Stock Optoins Vesting Percentage

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Unrecognized cost of unvested share-based compensation awards.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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

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