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Accounts Receivable-Net (Details) (USD $)
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Accounts Receivable-Net    
Billed $ 1,248,400,000 $ 1,177,600,000
Unbilled 1,214,800,000 1,076,800,000
Contract retentions 263,900,000 174,300,000
Total accounts receivable-gross 2,727,100,000 2,428,700,000
Allowance for doubtful accounts (72,100,000) (86,400,000)
Total accounts receivable -net 2,654,976,000 2,342,262,000
Period in which unbilled receivables are expected to be billed and collected 12 months 12 months
Sale of trade receivables, outstanding $ 111,900,000 $ 100,200,000