BUSINESS REALIGNMENT ACTIVITIES - SCHEDULE OF BUSINESS REALIGNMENT ACTIVITY (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2026	Sep. 28, 2025	Sep. 27, 2026	Sep. 28, 2025
Restructuring Cost and Reserve [Line Items]
Business realignment costs	$ 13,268	$ 10,577	$ 34,987	$ 51,569
Severance and employee benefit costs
Restructuring Cost and Reserve [Line Items]
Business realignment costs			6,618
Severance and employee benefit costs \| Advancing Agility & Automation Initiative
Restructuring Cost and Reserve [Line Items]
Business realignment costs	505	2,211	6,618	18,840
Other program costs \| Advancing Agility & Automation Initiative
Restructuring Cost and Reserve [Line Items]
Business realignment costs	12,763	8,366	28,369	32,729
Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServicesSold
Restructuring Cost and Reserve [Line Items]
Business realignment costs	283	0	283	0
Income Statement Location [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense
Restructuring Cost and Reserve [Line Items]
Business realignment costs	12,480	8,366	28,086	32,729
Income Statement Location [Axis]: hsy:RestructuringChargesBusinessRealignment
Restructuring Cost and Reserve [Line Items]
Business realignment costs	$ 505	$ 2,211	$ 6,618	$ 18,840

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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