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Retirement Benefits (Plan Assets target allocation) (Details)
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
US [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Actual Plan Asset Allocations 100.00% 100.00%
US [Member] | Equity Securities [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum 60.00%  
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum 80.00%  
Defined Benefit Plan, Actual Plan Asset Allocations 70.00% 71.00%
US [Member] | Debt Securities [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum 20.00%  
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum 30.00%  
Defined Benefit Plan, Actual Plan Asset Allocations 25.00% 23.00%
US [Member] | Real Estate [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum 0.00%  
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum 10.00%  
Defined Benefit Plan, Actual Plan Asset Allocations 5.00% 5.00%
US [Member] | Cash and Cash Equivalents [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum 0.00%  
Defined Benefit Plan, Actual Plan Asset Allocations 0.00% 1.00%
International [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Actual Plan Asset Allocations 100.00% 100.00%
International [Member] | Equity Securities [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum 55.00%  
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum 66.00%  
Defined Benefit Plan, Actual Plan Asset Allocations 61.00% 61.00%
International [Member] | Debt Securities [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum 33.00%  
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum 44.00%  
Defined Benefit Plan, Actual Plan Asset Allocations 37.00% 36.00%
International [Member] | Real Estate [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum 0.00%  
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum 2.00%  
Defined Benefit Plan, Actual Plan Asset Allocations 1.00% 1.00%
International [Member] | Cash and Cash Equivalents [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum 0.00%  
Defined Benefit Plan, Actual Plan Asset Allocations 1.00% 2.00%