Investment in Unconsolidated Subsidiary (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 28, 2019 USD ($)	Mar. 31, 2018 USD ($)	Dec. 28, 2019 USD ($) barrel / day $ / gal	Dec. 29, 2018 USD ($)	Dec. 30, 2017 USD ($)	Jan. 21, 2011
Schedule of Equity Method Investments [Line Items]
Processing Capability, Barrels of Input Feedstock Per Day | barrel / day			20,000
Investment in the joint venture	$ 689,354		$ 689,354	$ 410,177
Gain from equity method investments			$ 428	(550)	$ 265
Dollars per Gallon | $ / gal			1.00
Renewable Diesel, Percentage			0.10%
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital			$ 69,213	67,638	26,761
Diamond Green Diesel Holdings LLC Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage						50.00%
Investment in the joint venture	661,500		661,500
Gain from equity method investments			364,500	159,800	28,200
Income Tax Credits and Adjustments	$ 234,400	$ 92,700	274,700	155,900	160,400
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital			$ 67,500	$ 65,000	$ 25,000
Valero Energy Corporation [Member] | Diamond Green Diesel Holdings LLC Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage						50.00%