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Accounts Receivable - Net (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Mar. 31, 2017
Sep. 30, 2016
Billed $ 2,180,900 $ 2,267,600
Unbilled 2,105,400 1,890,200
Contract retentions 483,300 434,100
Total accounts receivable-gross 4,769,600 4,591,900
Allowance for doubtful accounts (60,700) (60,400)
Total accounts receivable-net $ 4,708,941 $ 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 $ 314,000 $ 356,300
Outstanding Receivables    
Number of Customers 0 0
Percentage of the Company's outstanding receivables, as a percent 10.00% 10.00%