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Net Earnings Per Share (Narrative) (Details)	3 Months Ended		6 Months Ended
	Feb. 29, 2012	Feb. 28, 2011	Feb. 29, 2012	Feb. 28, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Performance stock units included in calculation of diluted net earnings per share	12,821,000	12,685,000	12,792,000	12,664,000
Performance Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from the computation of earnings per share			47,318	98,625
Performance stock units included in calculation of diluted net earnings per share			40,754

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6505113



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-Name Statement of Financial Accounting Standard (FAS)

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-URI http://asc.fasb.org/extlink&oid=6510752



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- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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