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Receivables (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 26, 2015	Sep. 26, 2014
Components of receivables:
Amounts billed	$ 1,293,606	$ 1,425,341
Unbilled receivables and other	1,307,540	1,368,482
Retentions receivable	78,030	73,732
Total receivables, net	2,679,176	2,867,555
Other information about receivables:
Amounts due from the United States federal government, included above, net of advanced billings	335,352	324,928
Claims receivable	$ 53,394	$ 78,634
Duration which unbilled amounts will be billed and collected over (duration)	12 months

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