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Accounts Receivable-Net (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Accounts Receivable-Net    
Billed $ 2,426,200 $ 1,248,400
Unbilled 2,099,800 1,214,800
Contract retentions 379,600 263,900
Total accounts receivable-gross 4,905,600 2,727,100
Allowance for doubtful accounts (64,100) (72,100)
Total accounts receivable -net $ 4,841,450 $ 2,654,976
Period in which unbilled receivables are expected to be billed and collected 12 months 12 months
Total receivables sold that remain outstanding $ 240,800 $ 111,900