Investment in Unconsolidated Subsidiary (Revenues and Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended								9 Months Ended
	Oct. 02, 2021	Sep. 30, 2021	Jul. 03, 2021	Apr. 03, 2021	Sep. 30, 2020	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Oct. 02, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 26, 2020
Revenues:
Operating revenues	$ 1,185,916					$ 850,569			$ 3,431,301			$ 2,552,084
Expenses:
Cost of sales and operating expenses	859,604					638,368			2,510,461			1,917,623
Total costs and expenses	1,034,204					814,213			3,039,833			2,447,923
Operating income	205,663					127,455			673,432			356,572
Net income	$ 148,206		$ 198,069	$ 153,418		$ 101,605	$ 66,495	$ 86,091	$ 499,693			$ 254,191
Diamond Green Diesel Holdings LLC Joint Venture [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Revenues:
Operating revenues		$ 401,900			$ 346,276					$ 1,405,392	$ 1,000,717
Expenses:
Cost of sales and operating expenses		281,848			153,406					804,939	462,364
Depreciation, amortization and accretion expense		10,991			10,772					34,673	33,660
Total costs and expenses		292,839			164,178					839,612	496,024
Operating income		109,061			182,098					565,780	504,693
Other income		113			415					524	1,076
Interest and debt expense, net		(1,272)			(315)					(2,376)	(947)
Net income		$ 107,902			$ 182,198					$ 563,928	$ 504,822