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PENSION AND OTHER POST-RETIREMENT BENEFIT PLANS - PENSION AND OTHER POST-RETIREMENT BENEFIT PLANS NARRATIVE (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2023 USD ($) | Oct. 01, 2023 USD ($) | Dec. 31, 2024 USD ($) post-retirementPlan | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2033 | Dec. 31, 2030
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Number of defined benefit other post-retirement plans and defined contribution other post-retirement plans | post-retirementPlan |  |  | 2 |  |  |  |
Accumulated benefit obligation |  |  | $ 753,886 | $ 789,257 |  |  |
Expense |  |  | 74,094 | 67,763 | $ 61,477 |  |
Pension Benefits |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined benefit plan, benefit obligation, actuarial gain |  |  | $ 5,337 | $ (23,187) |  |  |
Discount rate |  |  | 5.50% | 5.10% |  |  |
Employer contributions |  |  | $ 3,566 | $ 6,576 |  |  |
Minimum future employer contributions in next fiscal year |  |  | 1,936 |  |  |  |
Benefits paid |  |  | 22,341 | 23,967 |  |  |
Settlement |  |  | (14,894) | (15,254) | (20,692) |  |
Other Benefits |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined benefit plan, benefit obligation, actuarial gain |  |  | $ (4,845) | $ (38,789) |  |  |
Discount rate |  |  | 5.70% | 5.20% |  |  |
Health care cost trend rate assumed, next fiscal year |  |  | 6.90% | 6.40% |  |  |
Employer contributions |  |  | $ 12,033 | $ 21,006 |  |  |
Benefits paid |  |  | 12,033 | 21,006 |  |  |
Settlement |  |  | $ 0 | $ (926) | $ 0 |  |
Other Benefits | The Hershey Company Retiree Medical and Life Insurance Plan |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Benefits paid | $ 88,689 |  |  |  |  |  |
Settlement |  | $ (926) |  |  |  |  |
Other Benefits | Scenario, Forecast |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Ultimate health care cost trend rate |  |  |  |  |  | 4.90% | 5.00%

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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