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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-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

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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.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(c)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

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.

+ References

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-Publisher FASB

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-SubTopic 10

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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The weighted-average period remaining as of the balance sheet date until option expiration pertaining to the outstanding stock options for all option plans in the customized range of exercise prices, which may be expressed in a variety of ways (for example, years, months).

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Share-Based Compensation (Schedule Of Information Regarding Stock Options Outstanding) (Details) (USD $)	12 Months Ended
	Sep. 30, 2011 years	Sep. 30, 2010	Sep. 30, 2009	Sep. 30, 2008
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock Options Outstanding Range of Exercise Prices, lower limit	$ 32.55	$ 32.55	$ 35.69
Stock Options Outstanding Range of Exercise Prices, upper limit	$ 54.88	$ 54.88	$ 54.88
Options Outstanding, Number Outstanding	435,054	761,931	891,826	1,139,201
Stock Options Outstanding, Weighted-Average Remaining Contractual Life	0.79
Options Outstanding, Weighted Average Exercise Price	$ 35.58	$ 35.15	$ 33.63	$ 30.40
Exercisable Options Outstanding, Number Exercisable	397,073	677,538	683,192
Exercisable Options Outstanding, Weighted Average Exercise Price	$ 35.42	$ 34.88	$ 31.61
$ 12.64 - $27.44 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock Options Outstanding Range of Exercise Prices, lower limit	$ 12.64
Stock Options Outstanding Range of Exercise Prices, upper limit	$ 27.44
Options Outstanding, Number Outstanding	108,372
Stock Options Outstanding, Weighted-Average Remaining Contractual Life	0.88
Options Outstanding, Weighted Average Exercise Price	$ 14.86
Exercisable Options Outstanding, Number Exercisable	108,105
Exercisable Options Outstanding, Weighted Average Exercise Price	$ 14.83
$ 32.55 - $37.98 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock Options Outstanding Range of Exercise Prices, lower limit	$ 32.55
Stock Options Outstanding Range of Exercise Prices, upper limit	$ 37.98
Options Outstanding, Number Outstanding	126,950
Stock Options Outstanding, Weighted-Average Remaining Contractual Life	1.92
Options Outstanding, Weighted Average Exercise Price	$ 37.25
Exercisable Options Outstanding, Number Exercisable	89,236
Exercisable Options Outstanding, Weighted Average Exercise Price	$ 37.20
$ 44.30 - $45.81 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock Options Outstanding Range of Exercise Prices, lower limit	$ 44.30
Stock Options Outstanding Range of Exercise Prices, upper limit	$ 45.81
Options Outstanding, Number Outstanding	199,732
Stock Options Outstanding, Weighted-Average Remaining Contractual Life	0.02
Options Outstanding, Weighted Average Exercise Price	$ 45.77
Exercisable Options Outstanding, Number Exercisable	199,732
Exercisable Options Outstanding, Weighted Average Exercise Price	$ 45.77