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Receivables (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 01, 2016	Oct. 02, 2015
Components of receivables:
Amounts billed	$ 1,289,617	$ 1,213,892
Unbilled receivables and other	1,041,538	1,252,509
Retentions receivable	93,292	82,342
Total receivables, net	2,424,447	2,548,743
Other information about receivables:
Amounts due from the United States federal government, included above, net of advanced billings	299,972	327,157
Claims receivable	$ 19,948	$ 32,511
Duration which unbilled amounts will be billed and collected over (duration)	12 months

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Other Information About Receivables [Abstract]

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Amount billed to customers under long-term contracts or programs that have been withheld because of retainage provisions in a contract.

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Amount of billed or unbilled claims or other similar items subject to uncertainty concerning their determination or ultimate realization under long-term contracts.

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Amounts due within 1 year (or 1 business cycle) from other related parties which are not otherwise stated in the taxonomy.

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