Segment Information - Revenue and Long-lived Assets (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 03, 2021	Oct. 04, 2020	Jul. 05, 2020	Apr. 05, 2020	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Jan. 03, 2021	Dec. 29, 2019	Dec. 30, 2018
Segment Reporting Information [Line Items]
Total net sales	$ 276,947	$ 278,642	$ 259,504	$ 288,169	$ 339,482	$ 348,352	$ 357,507	$ 297,688	$ 1,103,262	$ 1,343,029	$ 1,179,573
Long-lived assets	359,036				324,585				359,036	324,585
Finance Lease, Right-of-Use Asset	6,138				5,007				6,138	5,007
United States
Segment Reporting Information [Line Items]
Total net sales									545,183	681,868	600,093
Long-lived assets	163,983				132,390				163,983	132,390
Finance Lease, Right-of-Use Asset	1,800				600				1,800	600
Germany
Segment Reporting Information [Line Items]
Total net sales									115,402	117,418	75,958
Long-lived assets	79,294				76,448				79,294	76,448
Foreign Countries Other Than United States And Germany
Segment Reporting Information [Line Items]
Total net sales									442,677	543,743	$ 503,522
Netherlands
Segment Reporting Information [Line Items]
Long-lived assets	51,190				48,220				51,190	48,220
Foreign Countries Other Than United States, Germany And Netherlands
Segment Reporting Information [Line Items]
Long-lived assets	64,569				67,527				64,569	67,527
Other foreign countries
Segment Reporting Information [Line Items]
Finance Lease, Right-of-Use Asset	$ 4,300				$ 4,400				$ 4,300	$ 4,400