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Accounts Receivable-Net (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Accounts Receivable-Net    
Billed $ 1,277,600,000 $ 1,207,000,000
Unbilled 1,152,700,000 1,145,100,000
Contract retentions 157,900,000 156,600,000
Total accounts receivable-gross 2,588,200,000 2,508,700,000
Allowance for doubtful accounts (106,400,000) (112,800,000)
Total accounts receivable -net 2,481,834,000 2,395,881,000
Period in which unbilled receivables are expected to be billed and collected 12 months 12 months
Sale of trade receivable $ 89,600,000