Segment Information - Revenues and Long-lived Assets by Geographical Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Dec. 29, 2018
Segment Reporting Information [Line Items]
Net sales	$ 361,971	$ 439,191	$ 1,165,350	$ 1,316,187
Long-lived assets	329,792		329,792		$ 339,894
Additions to long-lived assets			47,375	55,946
United States
Segment Reporting Information [Line Items]
Net sales	105,292	125,867	340,811	386,980
Long-lived assets	56,790		56,790		58,691
Additions to long-lived assets			4,972	5,636
China
Segment Reporting Information [Line Items]
Net sales	101,960	117,813	316,553	352,097
Long-lived assets	88,386		88,386		95,806
Additions to long-lived assets			12,418	19,043
Mexico
Segment Reporting Information [Line Items]
Long-lived assets	73,350		73,350		70,495
Additions to long-lived assets			12,650	14,089
Germany
Segment Reporting Information [Line Items]
Long-lived assets	35,817		35,817		36,548
Additions to long-lived assets			4,335	5,917
Philippines
Segment Reporting Information [Line Items]
Long-lived assets	37,775		37,775		32,459
Additions to long-lived assets			9,546	6,133
Other countries
Segment Reporting Information [Line Items]
Net sales	154,719	$ 195,511	507,986	577,110
Long-lived assets	$ 37,674		37,674		$ 45,895
Additions to long-lived assets			$ 3,454	$ 5,128