Pension, Postretirement and Postemployment Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)	12 Months Ended
	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 1,168,000	$ 1,300,000	$ 1,290,000
Interest cost	6,624,000	13,358,000	15,303,000
Expected return on assets	(6,163,000)	(18,475,000)	(19,534,000)
Amortization of prior service cost	(11,000)	0	0
Curtailment/Settlement losses	7,578,000	10,995,000	9,082,000
Curtailment/Settlement losses	110,962,000	0	0
Net periodic benefit cost (income)	120,158,000	7,178,000	6,141,000
Postretirement
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	888,000	756,000	691,000
Interest cost	1,267,000	1,171,000	1,179,000
Curtailment/Settlement losses	21,000	165,000	0
Net periodic benefit cost (income)	$ 2,176,000	$ 2,092,000	$ 1,870,000