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Receivables (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Sep. 30, 2016
Components of receivables:    
Amounts billed $ 934,769 $ 1,110,042
Unbilled receivables and other 1,118,776 937,552
Retentions receivable 32,786 68,069
Total receivables, net 2,086,331 2,115,663
Other information about receivables:    
Amounts due from the United States federal government, included above, net of advanced billings 224,284 235,203
Claims receivable $ 17,830 $ 26,061