Investment in Unconsolidated Subsidiary Selected Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 02, 2021	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Jan. 02, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 28, 2019	Dec. 31, 2018	Dec. 29, 2018	Dec. 30, 2017
Assets:
Total current assets	$ 986,994				$ 917,288				$ 986,994			$ 917,288
Property, plant and equipment, net	1,863,814				1,802,411				1,863,814			1,802,411
Other assets	60,682				47,400				60,682			47,400
Total assets	5,613,331				5,345,258				5,613,331			5,345,258
LIABILITIES AND STOCKHOLDERS’ EQUITY
Less Current Maturities	27,538				90,996				27,538			90,996
Other noncurrent liabilities	117,371				115,785				117,371			115,785
Total members' equity	2,954,209				2,643,350				2,954,209			2,643,350		$ 2,335,821	$ 2,327,697
Total liabilities and member's equity	5,613,331				5,345,258				5,613,331			5,345,258
Revenues:
Operating revenues	1,019,839	$ 850,569	$ 848,673	$ 852,842	859,428	$ 842,049	$ 827,324	$ 835,104	3,571,923			3,363,905		3,387,726
Expenses:
Cost of sales and operating expenses									2,688,815			2,589,085		2,646,374
Operating income									3,456,082			3,252,536		3,292,504
Net income	$ 46,139	$ 101,605	$ 66,495	$ 86,091	$ 243,446	$ 26,837	$ 31,044	$ 19,640	$ 300,330			$ 320,967		$ 105,944
Diamond Green Diesel Holdings LLC Joint Venture [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Assets:
Total current assets										$ 383,557	$ 668,026
Property, plant and equipment, net										1,238,726	713,489
Other assets										36,082	30,710
Total assets										1,658,365	1,412,225
LIABILITIES AND STOCKHOLDERS’ EQUITY
Less Current Maturities										517	341
Total other current liabilities										99,787	75,802
Total long term debt										8,705	8,742
Other noncurrent liabilities										3,758	4,422
Total members' equity										1,545,598	1,322,918
Total liabilities and member's equity										1,658,365	1,412,225
Revenues:
Operating revenues										1,267,477	1,217,504		$ 677,663
Expenses:
Cost of sales and operating expenses										592,781	438,672		329,636
Depreciation, amortization and accretion expense										44,882	50,767		29,434
Operating income										629,814	728,065		318,593
Other income										1,636	2,121		1,919
Interest and debt expense, net										(1,260)	(1,282)		(955)
Net income										$ 630,190	$ 728,904		$ 319,557