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Accounts Receivable - Net (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Billed $ 2,200,500 $ 2,267,600
Unbilled 1,941,800 1,890,200
Contract retentions 456,000 434,100
Total accounts receivable-gross 4,598,300 4,591,900
Allowance for doubtful accounts (59,900) (60,400)
Total accounts receivable-net $ 4,538,396 $ 4,531,460
Period in which unbilled receivables are expected to be billed and collected 12 months 12 months
Total receivables sold that remain outstanding $ 375,100 $ 356,300
Outstanding Receivables    
Number of Customers 0 0
Percentage of the Company's outstanding receivables, as a percent 10.00% 10.00%