BUSINESS ACQUISITIONS - Narrative (Details) $ in Thousands, £ in Millions, lb in Millions, bird / WK in Millions						12 Months Ended
	Oct. 15, 2019 USD ($) facility	Oct. 15, 2019 GBP (£)	Sep. 08, 2017 USD ($) bird / WK mill lb hatchery facility plant	Sep. 08, 2017 GBP (£)	Jan. 06, 2017 USD ($) intangible_asset	Dec. 29, 2019 USD ($) employee bird / WK plant	Dec. 30, 2018 USD ($)	Apr. 01, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 24, 2017 USD ($)	Mar. 26, 2017 USD ($)
Tulip Ltd. and Subsidiaries
Business Acquisition [Line Items]
Percentage of equity acquired	100.00%
Cash consideration	$ 391,500	£ 310.0
Fresh processing plants (in plants) | facility	14
Number of employees | employee						5,400
Transaction costs	$ 1,300
Net sales of acquiree since acquisition date						$ 306,700
Net income (loss) of acquiree since acquisition date						$ (2,700)
Identifiable intangible assets	$ 40,418
Tulip Ltd. and Subsidiaries | Customer relationships
Business Acquisition [Line Items]
Net sales growth rate used in determination of fair value	2.00%	2.00%
Attrition rate for existing customers used in determination of fair value	10.00%	10.00%
Percentage of pre-tax income used to estimate income taxes in 2020	18.00%	18.00%
Percentage of pre-tax income used to estimate income taxes after 2020	17.00%	17.00%
Discount rate	22.00%	22.00%
Identifiable intangible assets	$ 40,400
Weighted average useful life	11 years	11 years
Moy Park
Business Acquisition [Line Items]
Percentage of equity acquired			100.00%
Cash consideration			$ 301,300
Fresh processing plants (in plants) | plant			4
Number of employees | employee						10,200
Transaction costs			$ 19,900					$ 200	$ 4,500	$ 15,000
Net sales of acquiree since acquisition date						$ 2,100,000	$ 2,100,000
Net income (loss) of acquiree since acquisition date						$ 70,700	52,100
Note payable for consideration transferred | £				£ 562.5
Number of prepared foods cook plants | plant			10
Number of feed mills | mill			3
Number of hatcheries | hatchery			6
Number of rendering facilities | facility			1
Maximum processing capacity of employees per week (in birds per week) | bird / WK			6.1
Food prepared per year (in pounds) | lb			462.0
GNP
Business Acquisition [Line Items]
Percentage of equity acquired					100.00%
Cash consideration					$ 350,000
Number of employees | employee						1,700
Transaction costs					600						$ 600
Net sales of acquiree since acquisition date						$ 422,100	398,400
Net income (loss) of acquiree since acquisition date						$ 39,500	$ (1,400)
Identifiable intangible assets					$ 131,120
Weighted average useful life					15 years 2 months 12 days
Maximum processing capacity of employees per week (in birds per week) | bird / WK						2.1
Processing plants acquired (in plants) | plant						2
GNP | Trade names
Business Acquisition [Line Items]
Net sales growth rate used in determination of fair value					2.50%
Percentage of pre-tax income used to estimate income taxes in 2020					39.30%
Weighted average useful life					20 years
Income tax amortization benefit factor used in determination of fair value					1.2098
Discount rate to determine hypothetical savings generated by avoiding royalty costs					13.80%
Number of intangible assets acquired | intangible_asset					2
Finite-lived Intangible Assets Acquired, Fair Value Inputs, Royalty Rate					2.00%
GNP | Customer relationships
Business Acquisition [Line Items]
Net sales growth rate used in determination of fair value					2.50%
Attrition rate for existing customers used in determination of fair value					4.00%
Discount rate					13.80%
Weighted average useful life					13 years
Income tax amortization benefit factor used in determination of fair value					1.2098
Percentage of pre-tax income used to estimate income taxes					39.30%