Segment Information - Revenues and Long-lived Assets by Geographical Area (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019	Dec. 28, 2019
Segment Reporting Information
Net sales	$ 307,337	$ 397,879	$ 653,433	$ 803,379
Long-lived assets	334,677		334,677		$ 344,617
Additions to long-lived assets			23,037	29,858
United States
Segment Reporting Information
Net sales	76,870	115,991	179,780	235,519
Long-lived assets	54,082		54,082		58,081
Additions to long-lived assets			2,026	3,454
China
Segment Reporting Information
Net sales	102,026	107,728	188,041	214,593
Long-lived assets	82,224		82,224		88,306
Additions to long-lived assets			4,516	4,958
Mexico
Segment Reporting Information
Long-lived assets	67,967		67,967		73,096
Additions to long-lived assets			4,260	8,727
Germany
Segment Reporting Information
Long-lived assets	36,721		36,721		36,025
Additions to long-lived assets			2,509	3,712
Philippines
Segment Reporting Information
Long-lived assets	58,272		58,272		51,738
Additions to long-lived assets			9,039	6,629
Other countries
Segment Reporting Information
Net sales	128,441	$ 174,160	285,612	353,267
Long-lived assets	$ 35,411		35,411		$ 37,371
Additions to long-lived assets			$ 687	$ 2,378