Impairment and Restructuring Charges - Restructuring Accrual (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Restructuring Reserve
Beginning Accrual Balance			$ 7,043	$ 8,640
Additions Charged to Expense	$ 1,445	$ 4,784	3,736	6,869
Payments or Utilization			(5,522)	(9,107)
Ending Accrual Balance	5,257	6,402	5,257	6,402
Severance costs
Restructuring Reserve
Beginning Accrual Balance			5,314	5,353
Additions Charged to Expense			2,652	6,328
Payments or Utilization			(4,770)	(8,258)
Ending Accrual Balance	3,196	3,423	3,196	3,423
Other exit costs
Restructuring Reserve
Beginning Accrual Balance			1,729	3,287
Additions Charged to Expense			1,084	541
Payments or Utilization			(752)	(849)
Ending Accrual Balance	$ 2,061	$ 2,979	$ 2,061	$ 2,979