Investment in Unconsolidated Subsidiary (Assets, Liabilities and members' equity) (Details) - USD ($) $ in Thousands	Oct. 02, 2021	Sep. 30, 2021	Jul. 03, 2021	Apr. 03, 2021	Jan. 02, 2021	Dec. 31, 2020	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 28, 2019
ASSETS
Assets, Current	$ 1,103,644				$ 986,994
Property, Plant and Equipment, Net	1,834,670				1,863,814
Other assets	53,887				60,682
Segment Assets	5,925,720				5,613,331
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current portion of long-term debt	55,138				27,538
Other non-current liabilities	115,815				117,371
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	3,269,237		$ 3,183,810	$ 3,029,946	2,954,209		$ 2,835,189	$ 2,698,354	$ 2,608,442	$ 2,643,350
Liabilities and Equity	$ 5,925,720				$ 5,613,331
Diamond Green Diesel Holdings LLC Joint Venture [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees
ASSETS
Assets, Current		$ 365,354				$ 383,557
Property, Plant and Equipment, Net		2,192,808				1,238,726
Other assets		44,657				36,082
Segment Assets		2,602,819				1,658,365
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current portion of long-term debt		106,423				517
Other Liabilities, Current		228,657				99,787
Long-term Debt, Excluding Current Maturities		108,952				8,705
Other non-current liabilities		17,048				3,758
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		2,141,739				1,545,598
Liabilities and Equity		$ 2,602,819				$ 1,658,365