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Accounts Receivable - Net (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Mar. 31, 2018
Sep. 30, 2017
Billed $ 2,448,800 $ 2,317,800
Unbilled 2,201,300 2,293,500
Contract retentions 607,100 568,600
Total accounts receivable-gross 5,257,200 5,179,900
Allowance for doubtful accounts (48,300) (52,200)
Total accounts receivable-net $ 5,208,918 $ 5,127,743
Additional disclosures    
Unbilled receivables are expected to be billed and collected (in months) 12 months 12 months
Trade receivables sold, outstanding $ 344,800 $ 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%