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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, 2023 USD ($) post-retirementPlan | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | 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 |  |  |
Defined Benefit Plan, Accumulated Benefit Obligation |  |  | $ 789,257 | $ 799,635 |  |
Defined Contribution Plan, Cost |  |  | 67,763 | 61,477 | $ 58,883 |
Pension Benefits |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  |  | $ (23,187) | $ 184,775 |  |
Discount rate |  |  | 5.10% | 5.50% |  |
Employer contributions |  |  | $ 6,576 | $ 55,799 |  |
Defined Benefit Plans, Minimum Future Employer Contributions in Next Fiscal Year |  |  | 1,943 |  |  |
Benefits paid |  |  | 23,967 | 22,936 |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement |  |  | (15,254) | (20,692) | (16,085) |
Other Benefits |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  |  | $ (38,789) | $ 28,145 |  |
Discount rate |  |  | 5.20% | 5.50% |  |
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year |  |  | 6.40% | 6.70% |  |
Employer contributions |  |  | $ 21,006 | $ 22,748 |  |
Benefits paid |  |  | 21,006 | 22,748 |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement |  |  | $ (926) | $ 0 | $ 0 |
Other Benefits | The Hershey Company Retiree Medical and Life Insurance Plan |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Benefits paid | $ 88,689 |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement |  | $ (926) |  |  |  |
Other Benefits | Scenario, Forecast |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate |  |  |  |  |  | 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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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480266/715-60-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(6) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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