Accounts Receivable - Net (Details) (USD $)	3 Months Ended
	Jul. 01, 2012 M	Oct. 02, 2011
Accounts Receivable - Net
Billed	$ 355,556,000	$ 364,779,000
Unbilled	360,335,000	309,091,000
Contract retentions	15,439,000	15,553,000
Total accounts receivable - gross	731,330,000	689,423,000
Allowance for doubtful accounts	(34,120,000)	(32,244,000)
Total accounts receivable - net	697,210,000	657,179,000
Current billings in excess of costs on uncompleted contracts	94,659,000	84,754,000
Non-current billings in excess of costs on uncompleted contracts	4,267,000	5,832,000
Total billings in excess of costs on uncompleted contracts	98,926,000	90,586,000
Period for billing and collecting unbilled receivables (in months)	12
Unbilled accounts receivable related to claims and requests for equitable adjustment on contracts	25,000,000	16,000,000
Period for earning majority of billings in excess of costs (in months)	12
Billed accounts receivable related to U.S. federal government contracts	77,200,000	88,500,000
U.S. federal government unbilled receivables, net of progress payments	$ 111,200,000	$ 102,700,000