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Retirement Benefits (Schedule of Assumptions Used) (Details) | 12 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
United States Pension Plans of US Entity, Defined Benefit [Member] |  |  |
Weighted-average assumptions to determine benefit obligation at September 30: |  |  |
Discount rate | 3.65% | 4.39% | 4.40%
Rate of compensation increase |  |  | 3.50%
Weighted-average assumptions to determine periodic benefit costs for years ending September 30: |  |  |
Discount rate | 4.39% | 4.40% | 5.15%
Rate of compensation increase |  |  | 3.50%
Long-term rate of return on plan assets | 7.62% | 7.62% | 7.62%
United Kingdom Plan, Defined Benefit [Member] |  |  |
Weighted-average assumptions to determine benefit obligation at September 30: |  |  |
Discount rate | 2.28% | 3.75% | 4.10%
Rate of compensation increase | 3.40% | 3.40% | 3.50%
Weighted-average assumptions to determine periodic benefit costs for years ending September 30: |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate, Service Cost | 3.86% | 4.10% | 4.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate, Interest Cost | 3.63% | 4.10% | 4.50%
Rate of compensation increase | 3.40% | 3.50% | 3.50%
Long-term rate of return on plan assets | 5.00% | 5.50% | 5.50%
Japan Plan, Defined Benefit [Member] |  |  |
Weighted-average assumptions to determine benefit obligation at September 30: |  |  |
Discount rate | 0.46% | 0.97% | 1.10%
Rate of compensation increase | 2.02% | 2.00% | 2.00%
Weighted-average assumptions to determine periodic benefit costs for years ending September 30: |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate, Service Cost | 1.27% | 1.10% | 1.25%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate, Interest Cost | 0.59% | 1.10% | 1.25%
Rate of compensation increase | 2.00% | 2.00% | 2.00%
Long-term rate of return on plan assets | 3.00% | 3.00% | 3.00%
Switzerland Plan, Defined Benefit [Member] |  |  |
Weighted-average assumptions to determine periodic benefit costs for years ending September 30: |  |  |
Discount rate |  |  | 2.25%
Rate of compensation increase |  |  | 2.00%
Long-term rate of return on plan assets |  |  | 2.25%
Other Postretirement Benefit Plans, Defined Benefit [Member] |  |  |
Weighted-average assumptions to determine benefit obligation at September 30: |  |  |
Discount rate | 3.63% | 4.01% | 4.40%
Weighted-average assumptions to determine periodic benefit costs for years ending September 30: |  |  |
Discount rate | 4.01% | 4.40% | 5.14%

X
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- Definition Expected rate of compensation increases (for pay-related plans). + 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 (k)(2) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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