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Retirement Benefits (Schedule of Allocation of Plan Assets, Actual and Target Allocations) (Details) | 12 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014
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 | 0.30% | 0.20%
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 | 0.20% | 0.10%
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 | 1.00% | 0.90%
Equity Securities [Member] | United States Pension Plans of US Entity, Defined Benefit [Member] |  |
Target Allocation, Minimum | 40.70% | 40.70%
Target Allocation, Maximum | 80.70% | 80.70%
Actual Allocation of Plan Assets | 58.20% | 60.00%
Equity Securities [Member] | United Kingdom Plan, Defined Benefit [Member] |  |
Target Allocation, Minimum | 40.00% | 40.00%
Target Allocation, Maximum | 70.00% | 70.00%
Actual Allocation of Plan Assets | 36.00% | 48.20%
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 | 38.60% | 40.70%
Debt Securities [Member] | United States Pension Plans of US Entity, Defined Benefit [Member] |  |
Target Allocation, Minimum | 29.30% | 29.30%
Target Allocation, Maximum | 49.30% | 49.30%
Actual Allocation of Plan Assets | 41.50% | 39.80%
Debt Securities [Member] | United Kingdom Plan, Defined Benefit [Member] |  |
Target Allocation, Minimum | 35.00% | 35.00%
Target Allocation, Maximum | 65.00% | 65.00%
Actual Allocation of Plan Assets | 63.80% | 51.70%
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 | 60.40% | 58.40%

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