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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, 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%

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