Restructuring and Asset Impairment - Restructuring and Restructuring-related Asset Impairment Expenses by Type Incurred and by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2020	Mar. 31, 2019
Restructuring Cost and Reserve [Line Items]
Total Restructuring/Asset Impairment Charges	$ 12,599	$ 10,672
Severance and Termination Benefits
Restructuring Cost and Reserve [Line Items]
Total Restructuring/Asset Impairment Charges	10,100	6,300
Severance and Termination Benefits | Operating Segments | Consumer Packaging
Restructuring Cost and Reserve [Line Items]
Total Restructuring/Asset Impairment Charges	2,362	7,255
Severance and Termination Benefits | Operating Segments | Display and Packaging
Restructuring Cost and Reserve [Line Items]
Total Restructuring/Asset Impairment Charges	2,880	375
Severance and Termination Benefits | Operating Segments | Paper and Industrial Converted Products
Restructuring Cost and Reserve [Line Items]
Total Restructuring/Asset Impairment Charges	5,356	874
Severance and Termination Benefits | Operating Segments | Protective Solutions
Restructuring Cost and Reserve [Line Items]
Total Restructuring/Asset Impairment Charges	473	442
Asset Impairment/ Disposal of Assets
Restructuring Cost and Reserve [Line Items]
Total Restructuring/Asset Impairment Charges	2,686	1,632
Other Costs
Restructuring Cost and Reserve [Line Items]
Total Restructuring/Asset Impairment Charges	(187)	2,740
Other Costs | Corporate
Restructuring Cost and Reserve [Line Items]
Total Restructuring/Asset Impairment Charges	$ 1,528	$ 1,726