Investment in Unconsolidated Subsidiary Selected Financial Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Assets:
Property, plant and equipment, net	$ 576,384	$ 435,328
Total assets	787,243	642,761
Liabilities and members' equity:
Total current portion of long term debt	189	17,023
Total long term debt	8,485	36,730
Total members' equity	737,411	547,853
Expenses:
Operating income	318,593	57,441	$ 146,627
Interest and debt expense, net	(955)	(2,306)	(7,354)
Diamond Green Diesel Holdings LLC Joint Venture [Member]
Assets:
Total current assets	186,258	202,778
Other assets	24,601	4,655
Liabilities and members' equity:
Total other current liabilities	40,619	40,705
Total other long term liabilities	539	450
Total liabilities and member's equity	787,243	642,761
Revenues:
Operating revenues	677,663	633,908	527,670
Equity Method Investment, Summarized Financial Information, Total Costs and Expenses Less Depreciation, Amortization and Accretion Expense	329,636	547,512	353,222
Equity Method Investment, Summarized Financial Information, Depreciation, Amortization and Accretion Expense	29,434	28,955	27,821
Expenses:
Other income	1,919	1,343	551
Net income	$ 319,557	$ 56,478	$ 139,824