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Related Party Transactions (Details) - USD ($)		3 Months Ended		6 Months Ended
	Feb. 23, 2015	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016	Dec. 31, 2016
Related Party Transaction [Line Items]
Payments on long-term debt				$ (67,974,000)	$ (59,255,000)
Diamond Green Diesel Holdings LLC Joint Venture [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties		$ 42,500,000	$ 42,900,000	78,100,000	$ 66,600,000
Accounts Receivable, Related Parties, Current		5,900,000		5,900,000		$ 6,300,000
Related Party Sales Eliminated				5,500,000
Deferred Revenue, Additions				1,100,000
Revolving Loan Agreement [Member] | Revolving Credit Facility [Member]
Related Party Transaction [Line Items]
Revolving Loan Agreement, Maximum Borrowing Capacity	$ 10,000,000.0
Revolving Loan Agreement, Fair Value of Amount Outstanding		$ 0		$ 0
Revolving Loan Agreement [Member] | Lender One [Member] | Revolving Credit Facility [Member]
Related Party Transaction [Line Items]
Revolving Loan Agreement, Maximum Borrowing Capacity	$ 5,000,000.0
LIBO Rate [Member] | Revolving Loan Agreement [Member] | Revolving Credit Facility [Member]
Related Party Transaction [Line Items]
Basis spread on variable rate	2.50%

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