Share-Based Compensation (Details 4) (USD $)	12 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Summary of performance-based restricted stock units outstanding
Forfeited, canceled or expired, Stock Units Exercise Price	$ 72.71
Performance-Based Restricted Stock Units [Member]
Summary of performance-based restricted stock units outstanding
Stock Units Exercise Price, Beginning Balance	$ 72.79
Granted, Stock Units	944,174
Granted, stock units weighted average grant date fair value	$ 76.64	$ 75.63	$ 62.50
Distributed, Stock Units	(122,554)
Distributed, Stock Units Exercise Price	$ 84.29
Forfeited, canceled or expired, Stock Units	(798,254)
Forfeited, canceled or expired, Stock Units Exercise Price	$ 82.24
Stock Units Exercise Price, Ending Balance	$ 70.96	$ 72.79
Stock Units, Beginning Balance	2,879,568
Stock Units, Vested and expected to vest at ending balance	234,015
Stock Units, Vested and expected to vest at ending balance, Exercise Price	70.32
Stock Units, Ending Balance	2,902,934	2,879,568

As of the balance sheet date, the weighted-average grant-date fair value for outstanding restricted stock units that are expected to vest.

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As of the balance sheet date, the number of shares for which restricted stock units, expected to vest, can be converted under the option plan.

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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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The 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 during the reporting period as a result of the occurrence of a terminating event specified in the contractual agreement of the plan.

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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