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Investment in Unconsolidated Subsidiary (Details) (USD $)	3 Months Ended		6 Months Ended			6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012	Dec. 29, 2012	Jun. 29, 2013 Diamond Green Diesel Holdings LLC Joint Venture [Member] boe	Jun. 30, 2012 Diamond Green Diesel Holdings LLC Joint Venture [Member]	Jan. 21, 2011 Diamond Green Diesel Holdings LLC Joint Venture [Member]	Jan. 21, 2011 Diamond Green Diesel Holdings LLC Joint Venture [Member] Valero Energy Corporation [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage								50.00%	50.00%
Joint Venture Potential Barrels Of Fuel Per Day						9,300
Line of Credit Facility, Term						14 years
Term loan facility						$ 221,300,000
Darling's total contributions for constructing and funding Joint Venture						111,700,000
Investment in the joint venture	104,297,000		104,297,000		62,495,000	104,300,000
Loss from equity method investments	$ 1,962,000	$ 656,000	$ 3,157,000	$ 892,000		$ 3,200,000	$ 900,000

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Darling's total contributions for constructing and funding Joint Venture

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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