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Employee Benefit Plans - Additional Information (Details) - USD ($) | 3 Months Ended
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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% |

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