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