Investment in Unconsolidated Subsidiary Selected Financial Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 31, 2018	Dec. 30, 2017
Assets:
Property, plant and equipment, net	$ 713,489	$ 576,384
Total assets	1,412,225	787,243
Liabilities and members' equity:
Total current portion of long term debt	341	189
Total long term debt	8,742	8,485
Total members' equity	1,322,918	737,411
Expenses:
Operating income	728,065	318,593	$ 57,441
Interest and debt expense, net	(1,282)	(955)	(2,306)
Diamond Green Diesel Holdings LLC Joint Venture [Member]
Assets:
Total current assets	668,026	186,258
Other assets	30,710	24,601
Liabilities and members' equity:
Total other current liabilities	75,802	40,619
Total other long term liabilities	4,422	539
Total liabilities and member's equity	1,412,225	787,243
Revenues:
Operating revenues	1,217,504	677,663	633,908
Equity Method Investment, Summarized Financial Information, Total Costs and Expenses Less Depreciation, Amortization and Accretion Expense	438,672	329,636	547,512
Equity Method Investment, Summarized Financial Information, Depreciation, Amortization and Accretion Expense	50,767	29,434	28,955
Expenses:
Other income	2,121	1,919	1,343
Net income	$ 728,904	$ 319,557	$ 56,478