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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%