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Accounts Receivable-Net (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Accounts Receivable-Net    
Billed $ 2,329,500 $ 2,426,200
Unbilled 2,145,900 2,099,800
Contract retentions 399,900 379,600
Total accounts receivable-gross 4,875,300 4,905,600
Allowance for doubtful accounts (67,400) (64,100)
Total accounts receivable-net $ 4,807,853 $ 4,841,450
Period in which unbilled receivables are expected to be billed and collected 12 months 12 months
Total receivables sold that remain outstanding $ 266,000 $ 240,800