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Accounts Receivable - Net (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Jun. 30, 2018
Sep. 30, 2017
Billed $ 2,560,600 $ 2,317,800
Unbilled 2,295,000 2,293,500
Contract retentions 638,900 568,600
Total accounts receivable-gross 5,494,500 5,179,900
Allowance for doubtful accounts (46,500) (52,200)
Total accounts receivable-net $ 5,447,985 $ 5,127,743
Additional disclosures    
Unbilled receivables are expected to be billed and collected (in months) 12 months 12 months
Trade receivables sold, outstanding $ 342,700 $ 325,200
Other than U.S government outstanding receivables    
Additional disclosures    
Number of Customers 0 0
Outstanding receivables (as a percent) 10.00% 10.00%