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Employee Benefit Plans - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 29, 2020
Mar. 31, 2019
Defined Benefit Plan Disclosure [Line Items]    
Contributions $ 2,309,000 $ 2,780,000
Expected contributions for remainder of fiscal year 15,000,000  
Settlement losses recognized 623,000 1,322,000
Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Settlement losses recognized 623,000 1,322,000
Pension Plan | Sonoco Pension Plan for Inactive Participants    
Defined Benefit Plan Disclosure [Line Items]    
Additional contributions anticipated to be made next year 150,000,000  
Additional contributions anticipated to be made next year (after tax) 112,000,000  
Non-cash settlement charges expected to be incurred next year 590,000,000  
Pension Plan | Sonoco Retirement Contribution    
Defined Benefit Plan Disclosure [Line Items]    
Contributions 22,503,000 14,573,000
Expected contributions for remainder of fiscal year 0  
Recognized expense related to the plan $ 5,978,000 $ 6,267,000
Pension Plan | United States | Sonoco Retirement Contribution    
Defined Benefit Plan Disclosure [Line Items]    
Employer matching contribution, percent of employees' gross pay 4.00%  
Employer matching contribution, percent of employees' gross pay in excess of social security 4.00%