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
	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Net sales	$ 810,195	$ 799,644	$ 789,051	$ 765,544	$ 771,178	$ 726,385	$ 698,651	$ 677,294	$ 3,164,434	$ 2,873,508	$ 2,528,052
Long-lived assets	384,224				341,306				384,224	341,306
United States
Net sales									1,197,665	1,000,680	984,773
Long-lived assets	106,757				108,694				106,757	108,694
Malaysia
Net sales									1,138,380	1,118,032	940,045
Long-lived assets	101,636				89,938				101,636	89,938
China
Net sales									418,825	379,977	339,216
Long-lived assets	22,378				21,878				22,378	21,878
Mexico
Net sales									231,643	218,264	181,573
Long-lived assets	73,864				43,078				73,864	43,078
Romania
Net sales									195,837	177,111	114,363
Long-lived assets	31,033				34,316				31,033	34,316
United Kingdom
Net sales									99,825	91,426	70,163
Long-lived assets	7,344				6,171				7,344	6,171
Germany
Net sales									14,271	12,953	8,303
Other Foreign
Long-lived assets	6,751				5,646				6,751	5,646
Elimination of inter-segment sales
Net sales									(132,012)	(124,935)	$ (110,384)
Corporate
Long-lived assets	$ 34,461				$ 31,585				$ 34,461	$ 31,585