Segment Information - Revenues and Long-lived Assets by Geographical Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019	Dec. 28, 2019
Segment Reporting Information
Net sales	$ 391,566	$ 361,971	$ 1,044,999	$ 1,165,350
Long-lived assets	339,870		339,870		$ 344,617
Additions to long-lived assets			36,693	47,375
United States
Segment Reporting Information
Net sales	106,121	105,292	285,901	340,811
Long-lived assets	52,009		52,009		58,081
Additions to long-lived assets			2,712	4,972
China
Segment Reporting Information
Net sales	126,506	101,960	314,547	316,553
Long-lived assets	82,956		82,956		88,306
Additions to long-lived assets			6,414	12,418
Mexico
Segment Reporting Information
Long-lived assets	68,346		68,346		73,096
Additions to long-lived assets			7,291	12,650
Germany
Segment Reporting Information
Long-lived assets	37,611		37,611		36,025
Additions to long-lived assets			3,793	4,335
Philippines
Segment Reporting Information
Long-lived assets	64,171		64,171		51,738
Additions to long-lived assets			15,331	9,546
Other countries
Segment Reporting Information
Net sales	158,939	$ 154,719	444,551	507,986
Long-lived assets	$ 34,777		34,777		$ 37,371
Additions to long-lived assets			$ 1,152	$ 3,454