Investment in Unconsolidated Subsidiary (Assets, Liabilities and members' equity) (Details) - USD ($) $ in Thousands	Sep. 27, 2025	Jun. 28, 2025	Mar. 29, 2025	Dec. 31, 2024	Dec. 28, 2024	Sep. 28, 2024	Jun. 29, 2024	Mar. 30, 2024	Dec. 30, 2023
ASSETS
Property, Plant and Equipment, Net	$ 2,786,142				$ 2,713,669
Other assets	209,766				199,594
Segment Assets	10,452,339				10,070,473
LIABILITIES AND STOCKHOLDERS’ EQUITY
Other non-current liabilities	206,193				208,350
Members equity	4,769,130	$ 4,692,833	$ 4,535,773		4,464,292	$ 4,634,294	$ 4,542,613	$ 4,682,990	$ 4,693,691
Liabilities and equity	10,452,339				$ 10,070,473
Diamond Green Diesel Holdings LLC Joint Venture
ASSETS
Cash	136,225			$ 353,446
Other Assets, Current	1,119,640			1,137,821
Property, Plant and Equipment, Net	3,750,079			3,868,943
Other assets	538,591			100,307
Segment Assets	5,544,535			5,460,517
LIABILITIES AND STOCKHOLDERS’ EQUITY
Revolver	100,000			0
Current portion of long-term debt	30,012			29,809
Other current liabilities	213,749			319,688
Long term debt	684,726			707,158
Other non-current liabilities	18,174			17,195
Members equity	4,497,874			4,386,667
Liabilities and equity	$ 5,544,535			$ 5,460,517