Reportable Segments, Geographic Information and Major Customers - Schedule of Net Sales and Long-Lived Assets (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 03, 2020	Jul. 04, 2020	Apr. 04, 2020	Jan. 04, 2020	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018	Sep. 29, 2019
Net sales	$ 913,227	$ 857,394	$ 767,364	$ 852,409	$ 810,195	$ 799,644	$ 789,051	$ 765,544	$ 3,390,394	$ 3,164,434	$ 2,873,508
Long-lived assets	383,661				384,224				383,661	384,224		$ 382,391
United States
Net sales									989,888	1,197,665	1,000,680
Long-lived assets	99,853				106,757				99,853	106,757
Malaysia
Net sales									1,432,154	1,138,380	1,118,032
Long-lived assets	108,400				101,636				108,400	101,636
China
Net sales									392,677	418,825	379,977
Long-lived assets	21,408				22,378				21,408	22,378
Mexico
Net sales									337,961	231,643	218,264
Long-lived assets	68,154				73,864				68,154	73,864
Romania
Net sales									217,295	195,837	177,111
Long-lived assets	33,801				31,033				33,801	31,033
United Kingdom
Net sales									118,463	99,825	91,426
Long-lived assets	7,484				7,344				7,484	7,344
Germany
Net sales									13,344	14,271	12,953
Other Foreign
Long-lived assets	6,446				6,751				6,446	6,751
Elimination of inter-segment sales
Net sales									(111,388)	(132,012)	$ (124,935)
Corporate
Long-lived assets	$ 38,115				$ 34,461				$ 38,115	$ 34,461