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Significant Accounting Policies (Details)
$ in Billions
 12 Months Ended
Sep. 30, 2014
USD ($)
item
Sep. 30, 2013
USD ($)
Sep. 30, 2012
USD ($)
Sep. 30, 2011
Fiscal Year        
Fiscal year period   364 days 364 days 364 days
Revenue Recognition        
Other direct costs | $ $ 3.5 $ 3.2 $ 3.0  
Cost-Plus Contracts        
Number of major types of cost-plus contracts the Company enters into 2      
Fixed Price Contracts        
Number of types of fixed price contracts 2      
Pension Plans        
Amortization period of the difference between actual return and expected return 5 years      
Specified percentage to be exceeded for amortization of cumulative, net unrecognized gains or losses (as a percent) 10.00%