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Receivables (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Mar. 28, 2014	Sep. 27, 2013
Components of receivables:
Amounts billed	$ 1,368,162	$ 1,389,278
Unbilled receivables and other	1,291,713	1,109,931
Retentions receivable	58,341	49,781
Total receivables, net	2,718,216	2,548,990
Other information about receivables:
Amounts due from the United States federal government, included above, net of advanced billings	291,393	292,698
Claims receivable	$ 36,805	$ 25,237
Unbilled amounts billed and collected	12 months

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