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Receivables (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Jun. 27, 2014
Sep. 27, 2013
Components of receivables:    
Amounts billed $ 1,350,511 $ 1,389,278
Unbilled receivables and other 1,317,215 1,109,931
Retentions receivable 68,284 49,781
Total receivables, net 2,736,010 2,548,990
Other information about receivables:    
Amounts due from the United States federal government, included above, net of advanced billings 255,267 292,698
Claims receivable $ 72,249 $ 25,237
Unbilled amounts billed and collected 12 months