Valuation And Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 29, 2012
Contract Loss Reserve [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	$ 44,228	$ 48,428	$ 45,173
Additions charged to costs and expenses	35,692	38,717	49,120
Deductions	43,909	43,567	47,986
Acquisitions	0	638	1,801
Foreign exchange impact and other	(27)	12	320
Balance at end of year	35,984	44,228	48,428
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	4,499	5,754	4,718
Additions charged to costs and expenses	3,192	1,779	3,936
Deductions	3,248	3,006	2,817
Acquisitions	0	0	0
Foreign exchange impact and other	(102)	(28)	(83)
Balance at end of year	4,341	4,499	5,754
Reserve for Inventory Valuation [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	94,446	96,519	94,470
Additions charged to costs and expenses	17,791	13,848	15,985
Deductions	12,114	15,735	14,101
Acquisitions	0	0	0
Foreign exchange impact and other	(1,576)	(186)	165
Balance at end of year	98,547	94,446	96,519
Deferred Tax Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	4,006	1,746	4,106
Additions charged to costs and expenses	1,585	2,959	77
Deductions	108	708	3,235
Acquisitions	0	0	977
Foreign exchange impact and other	(167)	9	(179)
Balance at end of year	$ 5,316	$ 4,006	$ 1,746