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Description Of Business And Basis Of Presentation (Tables)
12 Months Ended
Sep. 30, 2011
Description Of Business And Basis Of Presentation 
Revenues Realized From Each Of These Types Of Contracts
     2011     2010     2009  

Cost-reimbursable

     81     86     85

Fixed-price

     16        13        14   

Guaranteed maximum price

     3        1        1