Investment in Unconsolidated Subsidiary (Revenues and Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 27, 2025	Jun. 28, 2025	Mar. 29, 2025	Sep. 28, 2024	Jun. 29, 2024	Mar. 30, 2024	Sep. 27, 2025	Sep. 28, 2024
Revenues:
Operating revenues	$ 1,563,966			$ 1,421,891			$ 4,426,078	$ 4,297,482
Expenses:
Cost of sales and operating expenses (excludes depreciation and amortization, shown separately below)	1,176,957			1,108,319			3,381,801	3,353,406
Total costs and expenses	1,446,396			1,364,214			4,179,717	4,076,750
Operating income/(loss)	71,726			60,107			175,994	345,778
Income before income taxes	19,807			1,644			13,169	169,278
Income tax expense/(benefit)	(1,248)			(17,471)			1,663	(12,790)
Net income	21,055	$ 14,265	$ (23,814)	19,115	$ 81,365	$ 81,588	11,506	182,068
Diamond Green Diesel Holdings LLC Joint Venture
Revenues:
Operating revenues	1,203,732			1,224,679			3,201,472	3,819,870
Expenses:
Cost of sales and operating expenses (excludes depreciation and amortization, shown separately below)	1,160,562			1,126,200			3,257,113	3,300,483
Lower of cost or market (LCM) inventory valuation adjustment	37,811			20,310			(164,438)	57,814
Depreciation, amortization and accretion expense	75,398			68,303			204,399	195,503
Total costs and expenses	1,273,771			1,214,813			3,297,074	3,553,800
Operating income/(loss)	(70,039)			9,866			(95,602)	266,070
Other income	1,621			5,058			7,504	14,336
Interest and debt expense, net	(11,922)			(10,093)			(34,072)	(30,372)
Income before income taxes	(80,340)			4,831			(122,170)	250,034
Income tax expense/(benefit)	221			(29)			1,365	(58)
Net income	$ (80,561)			$ 4,860			$ (123,535)	$ 250,092