Retirement Benefits (Schedule of Allocation of Plan Assets, Actual and Target Allocations) (Details)	12 Months Ended
Sep. 30, 2011	Sep. 30, 2010
United States Pension Plans of US Entity, Defined Benefit [Member]
Equity Securities, Target Allocation, Minimum	39.70%	40.00%
Equity Securities, Target Allocation, Maximum	79.70%	60.00%
Equity Securities, Percentage of Plan Assets	58.70%	49.80%
Debt Securities, Target Allocation, Minimum	30.30%	40.00%
Debt Securities, Target Allocation, Maximum	50.30%	60.00%
Debt Securities, Percentage of Plan Assets	41.10%	50.00%
Other, Target Allocation, Minimum	0.00%	0.00%
Other, Target Allocation, Maximum	0.00%	0.00%
Other, Percentage of Plan Assets	0.20%	0.20%
United Kingdom Plan, Defined Benefit [Member]
Equity Securities, Target Allocation, Minimum	40.00%	46.00%
Equity Securities, Target Allocation, Maximum	60.00%	54.00%
Equity Securities, Percentage of Plan Assets	37.70%	40.70%
Debt Securities, Target Allocation, Minimum	35.00%	46.50%
Debt Securities, Target Allocation, Maximum	65.00%	53.50%
Debt Securities, Percentage of Plan Assets	62.20%	58.90%
Other, Target Allocation, Minimum	0.00%	0.00%
Other, Target Allocation, Maximum	0.00%	0.00%
Other, Percentage of Plan Assets	0.10%	0.40%
Japan Plan, Defined Benefit [Member]
Equity Securities, Target Allocation, Minimum	36.00%	50.00%
Equity Securities, Target Allocation, Maximum	44.00%	58.00%
Equity Securities, Percentage of Plan Assets	39.90%	55.20%
Debt Securities, Target Allocation, Minimum	55.00%	41.00%
Debt Securities, Target Allocation, Maximum	63.00%	49.00%
Debt Securities, Percentage of Plan Assets	59.20%	43.10%
Other, Target Allocation, Minimum	0.00%	0.00%
Other, Target Allocation, Maximum	2.00%	2.00%
Other, Percentage of Plan Assets	0.90%	1.70%
Switzerland Plan, Defined Benefit [Member]
Equity Securities, Target Allocation, Minimum	0.00%
Equity Securities, Target Allocation, Maximum	0.00%
Equity Securities, Percentage of Plan Assets	0.00%
Debt Securities, Target Allocation, Minimum	0.00%
Debt Securities, Target Allocation, Maximum	0.00%
Debt Securities, Percentage of Plan Assets	0.00%
Other, Target Allocation, Minimum	100.00%
Other, Target Allocation, Maximum	100.00%
Other, Percentage of Plan Assets	100.00%

The percentage of the fair value of debt securities to the fair value of total plan assets held as of the measurement date.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph d(1)

-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.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e2446-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

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- Definition

The percentage of the fair value of equity securities to the fair value of total plan assets held as of the measurement date.

+ References

+ Details

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- Definition

The percentage of the fair value of investments other than debt securities, equity securities, and real estate to the fair value of total plan assets held as of the measurement date.

+ References

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- Definition

Target allocation maximum percentage of investments in debt securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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- Definition

Target allocation minimum percentage of investments in debt securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph d(2)

-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.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)(i)

-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e2446-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(i)

-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

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- Definition

Target allocation maximum percentage of investments in equity securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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Target allocation minimum percentage of investments in equity securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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- Definition

Target allocation maximum percentage in other than debt securities, equity securities, and real estate to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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Target allocation minimum percentage in other than debt securities, equity securities, and real estate to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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