Retirement Benefits (Schedule of Allocation of Plan Assets, Actual and Target Allocations) (Details)	12 Months Ended
Sep. 30, 2016	Sep. 30, 2015
United States Pension Plans of US Entity, Defined Benefit [Member]
Actual Allocation of Plan Assets	100.00%	100.00%
United Kingdom Plan, Defined Benefit [Member]
Actual Allocation of Plan Assets	100.00%	100.00%
Japan Plan, Defined Benefit [Member]
Actual Allocation of Plan Assets	100.00%	100.00%
Other Investment Asset [Member] \| United States Pension Plans of US Entity, Defined Benefit [Member]
Target Allocation, Minimum	0.00%	0.00%
Target Allocation, Maximum	0.00%	0.00%
Actual Allocation of Plan Assets	4.60%	0.30%
Other Investment Asset [Member] \| United Kingdom Plan, Defined Benefit [Member]
Target Allocation, Minimum	0.00%	0.00%
Target Allocation, Maximum	0.00%	0.00%
Actual Allocation of Plan Assets	0.10%	0.20%
Other Investment Asset [Member] \| Japan Plan, Defined Benefit [Member]
Target Allocation, Minimum	0.00%	0.00%
Target Allocation, Maximum	2.00%	2.00%
Actual Allocation of Plan Assets	0.90%	1.00%
Equity Securities [Member] \| United States Pension Plans of US Entity, Defined Benefit [Member]
Target Allocation, Minimum	40.80%	40.70%
Target Allocation, Maximum	80.80%	80.70%
Actual Allocation of Plan Assets	56.40%	58.20%
Equity Securities [Member] \| United Kingdom Plan, Defined Benefit [Member]
Target Allocation, Minimum	25.00%	40.00%
Target Allocation, Maximum	45.00%	70.00%
Actual Allocation of Plan Assets	34.70%	36.00%
Equity Securities [Member] \| Japan Plan, Defined Benefit [Member]
Target Allocation, Minimum	36.00%	36.00%
Target Allocation, Maximum	44.00%	44.00%
Actual Allocation of Plan Assets	40.00%	38.60%
Debt Securities [Member] \| United States Pension Plans of US Entity, Defined Benefit [Member]
Target Allocation, Minimum	29.20%	29.30%
Target Allocation, Maximum	49.20%	49.30%
Actual Allocation of Plan Assets	39.00%	41.50%
Debt Securities [Member] \| United Kingdom Plan, Defined Benefit [Member]
Target Allocation, Minimum	40.00%	35.00%
Target Allocation, Maximum	80.00%	65.00%
Actual Allocation of Plan Assets	65.20%	63.80%
Debt Securities [Member] \| Japan Plan, Defined Benefit [Member]
Target Allocation, Minimum	55.00%	55.00%
Target Allocation, Maximum	63.00%	63.00%
Actual Allocation of Plan Assets	59.10%	60.40%

Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis.

Reference 1: 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=65897934&loc=d3e2446-114920

Reference 2: 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=65897934&loc=d3e1928-114920

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Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis.

+ References

Reference 1: 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=65897934&loc=d3e1928-114920

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=65897934&loc=d3e2446-114920

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- Definition

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

Reference 1: 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=65897934&loc=d3e2446-114920

Reference 2: 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=65897934&loc=d3e1928-114920

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