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Retirement Benefits (Schedule of Assumptions Used) (Details)
 12 Months Ended
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%