Valuation And Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Sep. 27, 2014
Contract Loss Reserve Member
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 30,422	$ 35,984	$ 44,228
Additions charged to cost and expenses	29,469	24,073	35,692
Deductions	27,152	29,120	43,909
Foreign exchange impact and other	(196)	(515)	(27)
Balance at end of year	32,543	30,422	35,984
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	5,286	4,341	4,499
Additions charged to cost and expenses	1,594	2,889	3,192
Deductions	2,095	1,624	3,248
Foreign exchange impact and other	(247)	(320)	(102)
Balance at end of year	4,538	5,286	4,341
Inventory Valuation Reserve [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	103,350	102,572	98,113
Additions charged to cost and expenses	24,183	21,166	17,791
Deductions	17,622	17,911	11,783
Foreign exchange impact and other	(719)	(2,477)	(1,549)
Balance at end of year	109,192	103,350	102,572
Valuation Allowance of Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	9,583	9,216	7,906
Additions charged to cost and expenses	2,981	1,313	1,585
Deductions	1,521	281	108
Foreign exchange impact and other	(105)	(665)	(167)
Balance at end of year	$ 10,938	$ 9,583	$ 9,216