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DOCUMENT AND ENTITY INFORMATION - USD ($)
9 Months Ended
Oct. 01, 2017
Oct. 20, 2017
Jul. 01, 2016
Document Information [Line Items]      
Entity registrant name HERSHEY CO    
Entity central index key 0000047111    
Current fiscal year end date --12-31    
Entity filer category Large Accelerated Filer    
Document type 10-Q    
Document period end date Oct. 01, 2017    
Document fiscal year focus 2017    
Document fiscal period focus Q3    
Amendment flag false    
Entity well-known seasoned issuer Yes    
Entity voluntary filers No    
Entity current reporting status Yes    
Entity public float     $ 15,563,409,682
Common stock      
Document Information [Line Items]      
Entity common stock, shares outstanding (shares)   150,075,619  
Class B common stock      
Document Information [Line Items]      
Entity common stock, shares outstanding (shares)   60,619,777