Other (Income) Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Other Income and Expenses [Abstract]
Pension benefit expense	$ (2,156)	$ 2,652	$ 631	$ 5,400
Foreign currency gain	6,324	5,475	4,074	179
Governmental pandemic assistance reimbursement	(5,881)	0	(5,881)	0
Gain on sale of business units, property, and equipment	(337)	(2,374)	(2,410)	(1,792)
Other income items	(448)	(882)	(1,243)	(1,141)
Legal settlement income	0	0	0	(1,247)
Total other (income) expense	$ (2,498)	$ 4,871	$ (4,829)	$ 1,399