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STOCK COMPENSATION PLAN (Details) - Performance Stock Units and Restricted Stock Units (USD $)
3 Months Ended
Apr. 05, 2015
Mar. 30, 2014
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award      
Outstanding at beginning of year 904,306us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber    
Granted 266,099us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 292,896us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod  
Performance assumption change (159,026)hsy_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceAssumptionChange    
Vested (356,305)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod    
Forfeited (7,923)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod    
Outstanding as of end of period 647,151us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber    
Outstanding as of beginning of year $ 94.48us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue    
Granted $ 109.35us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 117.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue  
Performance assumption change $ 81.58hsy_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceAssumptionChangeWeightedAverageGrantDateFairValue    
Vested $ 73.04us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue    
Forfeited $ 88.13us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue    
Outstanding as of end of period $ 106.04us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Excluded 23,622hsy_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumberExcluded   25,462hsy_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumberExcluded
Fair Value of Performance Stock Units and Restricted Stock Units [Abstract]      
PSU Fair Value Monte Carlo Simulation Estimated Value (per unit) $ 61.22hsy_PsuFairValueMonteCarloSimulationEstimatedValue $ 80.95hsy_PsuFairValueMonteCarloSimulationEstimatedValue  
PSU Fair Value Monte Carlo Simulation Dividend Yields 2.00%hsy_PsuFairValueMonteCarloSimulationDividendYields 1.80%hsy_PsuFairValueMonteCarloSimulationDividendYields  
PSU Fair Value Monte Carlo Simulation Expected Volatility 14.90%hsy_PsuFairValueMonteCarloSimulationExpectedVolatility 15.50%hsy_PsuFairValueMonteCarloSimulationExpectedVolatility  
Intrinsic value of share-based liabilities paid, combined with the fair value of shares vested $ 37,464,000hsy_ShareBasedCompensationArrangementByShareBasedPaymentAwardIntrinsicValueOfShareBasedLiabilitiesPaidCombinedWithFairValueOfSharesVested $ 52,777,000hsy_ShareBasedCompensationArrangementByShareBasedPaymentAwardIntrinsicValueOfShareBasedLiabilitiesPaidCombinedWithFairValueOfSharesVested  
Deferred performance stock units, deferred restricted stock units representing directors' fees (units) 501,480us-gaap_DeferredCompensationArrangementWithIndividualSharesIssued    
Performance Stock Units and Restricted Stock Units [Member]      
Fair Value of Performance Stock Units and Restricted Stock Units [Abstract]      
Number of shares of common stock into which another unit of deferred performance stock and restricted stock is converted one