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Receivables (Details) - USD ($)
$ in Thousands
Dec. 30, 2016
Sep. 30, 2016
Components of receivables:    
Amounts billed $ 961,519 $ 1,110,042
Unbilled receivables and other 1,059,698 937,552
Retentions receivable 71,637 68,069
Total receivables, net 2,092,854 2,115,663
Other information about receivables:    
Amounts due from the United States federal government, included above, net of advanced billings 219,171 235,203
Claims receivable $ 7,437 $ 26,061