Segment Information - Revenues and Long-lived Assets by Geographical Area (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 402,281	$ 439,191	$ 459,183	$ 417,813	$ 304,849	$ 317,889	$ 313,355	$ 285,441	$ 1,718,468	$ 1,221,534	$ 1,056,159
Long-lived assets	339,894				250,577				339,894	250,577	217,175
Additions to long-lived assets									74,753	65,925	46,228
United States
Segment Reporting Information [Line Items]
Net sales									511,544	383,025	356,674
Long-lived assets	58,691				23,490				58,691	23,490	23,731
Additions to long-lived assets									5,567	3,518	4,694
China
Segment Reporting Information [Line Items]
Net sales									468,174	321,111	263,701
Long-lived assets	95,806				86,866				95,806	86,866	65,345
Additions to long-lived assets									29,286	32,775	13,181
Mexico
Segment Reporting Information [Line Items]
Long-lived assets	70,495				62,510				70,495	62,510	52,262
Additions to long-lived assets									18,723	19,395	15,667
Germany
Segment Reporting Information [Line Items]
Long-lived assets	36,548				1,082				36,548	1,082	1,313
Additions to long-lived assets									5,208	93	965
Philippines
Segment Reporting Information [Line Items]
Long-lived assets	32,459				31,129				32,459	31,129	33,345
Additions to long-lived assets									7,605	2,979	5,096
Other countries
Segment Reporting Information [Line Items]
Net sales									738,750	517,398	435,784
Long-lived assets	$ 45,895				$ 45,500				45,895	45,500	41,179
Additions to long-lived assets									$ 8,364	$ 7,165	$ 6,625