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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%