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PENSION AND OTHER POST-RETIREMENT BENEFIT PLANS - SCHEDULE OF DEFINED BENEFIT OBLIGATIONS, PLAN ASSETS AND FUNDED STATUS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Amounts recognized in the Consolidated Balance Sheets:        
Pension   $ 48,506 $ 53,495  
Amounts recognized in Accumulated Other Comprehensive Income (Loss), net of tax:        
Net amounts recognized in AOCI   126,800 118,254  
Pension Benefits         
Change in benefit obligation        
Projected benefit obligation at beginning of year   830,285 1,076,180  
Service cost   14,991 17,500 $ 21,361
Interest cost   41,205 30,491 18,320
Actuarial (gain) loss   23,187 (184,775)  
Curtailment   0 0  
Settlement   (66,132) (82,907)  
Currency translation and other   2,466 (3,268)  
Benefits paid   (23,967) (22,936)  
Projected benefit obligation at end of year   822,035 830,285 1,076,180
Change in plan assets        
Fair value of plan assets at beginning of year   848,432 1,098,191  
Actual return on plan assets   70,096 (196,969)  
Employer contributions   6,576 55,799  
Settlement   (66,132) (82,907)  
Annuity purchase   0 0  
Currency translation and other   1,838 (2,746)  
Benefits paid   (23,967) (22,936)  
Fair value of plan assets at end of year   836,843 848,432 1,098,191
Funded status at end of year   14,808 18,147  
Amounts recognized in the Consolidated Balance Sheets:        
Pension   48,506 53,495  
Accrued liabilities   (4,749) (7,652)  
Other long-term liabilities   (28,949) (27,696)  
Total   14,808 18,147  
Amounts recognized in Accumulated Other Comprehensive Income (Loss), net of tax:        
Actuarial net (loss) gain   (129,184) (150,378)  
Net prior service credit   8,561 12,435  
Net amounts recognized in AOCI   (120,623) (137,943)  
Other Benefits         
Change in benefit obligation        
Projected benefit obligation at beginning of year   164,889 211,490  
Service cost   221 302 1,879
Interest cost   7,171 4,603 3,857
Actuarial (gain) loss   38,789 (28,145)  
Curtailment   (740) 0  
Settlement   (88,689) 0  
Currency translation and other   (324) (613)  
Benefits paid   (21,006) (22,748)  
Projected benefit obligation at end of year   100,311 164,889 211,490
Change in plan assets        
Fair value of plan assets at beginning of year   0 0  
Actual return on plan assets   0 0  
Employer contributions   21,006 22,748  
Settlement   (88,689) 0  
Annuity purchase   88,689 0  
Currency translation and other   0 0  
Benefits paid   (21,006) (22,748)  
Fair value of plan assets at end of year   0 0 $ 0
Funded status at end of year   (100,311) (164,889)  
Amounts recognized in the Consolidated Balance Sheets:        
Pension   0 0  
Accrued liabilities   (9,593) (17,715)  
Other long-term liabilities   (90,718) (147,174)  
Total   (100,311) (164,889)  
Amounts recognized in Accumulated Other Comprehensive Income (Loss), net of tax:        
Actuarial net (loss) gain   (7,704) 19,689  
Net prior service credit   527 0  
Net amounts recognized in AOCI   $ (7,177) $ 19,689  
Other Benefits  | The Hershey Company Retiree Medical and Life Insurance Plan        
Change in benefit obligation        
Benefits paid $ (88,689)