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General (Details) (USD $) | 3 Months Ended | 12 Months Ended |  |  | 12 Months Ended | 0 Months Ended
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Dec. 28, 2013 | Sep. 28, 2013 | Jun. 29, 2013 | Mar. 30, 2013 | Dec. 29, 2012 | Sep. 29, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 28, 2013 weeks | Dec. 29, 2012 weeks | Dec. 31, 2011 weeks | Dec. 28, 2013 Foreign Exchange Contract [Member] Designated as Hedging Instrument [Member] Other Assets [Member] | Dec. 28, 2013 Stock Options [Member] | Dec. 29, 2012 Stock Options [Member] | Dec. 31, 2011 Stock Options [Member] | Dec. 28, 2013 Non Vested Stock [Member] | Dec. 29, 2012 Non Vested Stock [Member] | Dec. 31, 2011 Non Vested Stock [Member] | Dec. 28, 2013 Rothsay [Member] segment | Oct. 28, 2013 Rothsay [Member] | Dec. 28, 2013 Credit Agreement Term Loan [Member] Secured Debt [Member] | Dec. 28, 2013 Darling International Senior Secured Revolving Loan Facility [Member] Secured Debt [Member] | Dec. 28, 2013 Minimum [Member] weeks facilities | Dec. 28, 2013 Minimum [Member] Buildings and improvements [Member] | Dec. 28, 2013 Minimum [Member] Machinery and equipment [Member] | Dec. 28, 2013 Minimum [Member] Vehicles [Member] | Dec. 28, 2013 Minimum [Member] Aircraft [Member] | Dec. 28, 2013 Minimum [Member] Routes [Member] | Dec. 28, 2013 Minimum [Member] Permits [Member] | Dec. 28, 2013 Minimum [Member] Non-compete agreements [Member] | Dec. 28, 2013 Minimum [Member] Trade Names [Member] | Dec. 28, 2013 Maximum [Member] weeks | Dec. 28, 2013 Maximum [Member] Buildings and improvements [Member] | Dec. 28, 2013 Maximum [Member] Machinery and equipment [Member] | Dec. 28, 2013 Maximum [Member] Vehicles [Member] | Dec. 28, 2013 Maximum [Member] Aircraft [Member] | Dec. 28, 2013 Maximum [Member] Routes [Member] | Dec. 28, 2013 Maximum [Member] Permits [Member] | Dec. 28, 2013 Maximum [Member] Non-compete agreements [Member] | Dec. 28, 2013 Maximum [Member] Trade Names [Member] | Dec. 18, 2013 Common Stock [Member] | Jan. 27, 2011 Common Stock [Member]
General [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Processing and Transfer Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 130 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Weeks Of Contribution In Year End Results From Assets Acquired |  |  |  |  |  |  |  |  |  |  |  | 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Weeks Year To Date |  |  |  |  |  |  |  |  |  |  |  | 52 | 52 | 52 |  |  |  |  |  |  |  |  |  |  |  | 52 |  |  |  |  |  |  |  |  | 53 |  |  |  |  |  |  |  |  |  |
Cash and Cash Equivalents [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments Classified As Cash Equivalents, Original Maturity |  |  |  |  |  |  |  |  |  |  |  | 3 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 years | 3 years | 3 years | 7 years |  |  |  |  |  | 30 years | 10 years | 8 years | 10 years |  |  |  |  |  |
Finite-Lived Intangible Assets, Useful Life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years | 10 years | 3 years | 4 years |  |  |  |  |  | 21 years | 20 years | 7 years | 15 years |  |
Goodwill [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 701,637,000 |  |  |  |  |  |  | $ 381,369,000 |  |  |  | $ 701,637,000 | $ 381,369,000 |  |  |  |  |  |  |  |  |  | $ 261,668,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 46,000,000 | 24,193,548
Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  | 108,967,000 | 130,770,000 | 169,418,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares |  |  |  |  |  |  |  |  |  |  |  | 119,526,000 | 117,592,000 | 114,924,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share | $ 0.18 | [1] | $ 0.23 | [1] | $ 0.22 | [1] | $ 0.27 | $ 0.24 | $ 0.32 | $ 0.31 | $ 0.24 | $ 0.91 | $ 1.11 | $ 1.47 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effect of dilutive securities: [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Add: Option shares in the money and dilutive effect of non-vested stock |  |  |  |  |  |  |  |  |  |  |  | 848,000 | 806,000 | 972,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less: Pro forma treasury shares |  |  |  |  |  |  |  |  |  |  |  | (450,000) | (309,000) | (371,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  |  |  |  | 108,967,000 | 130,770,000 | 169,418,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares |  |  |  |  |  |  |  |  |  |  |  | 119,924,000 | 118,089,000 | 115,525,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Per Share | $ 0.18 | [1] | $ 0.23 | [1] | $ 0.22 | [1] | $ 0.27 | $ 0.24 | $ 0.31 | $ 0.31 | $ 0.24 | $ 0.91 | $ 1.11 | $ 1.47 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share, amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 135,733 | 207,890 | 63,272 | 57,257 | 105,486 | 330,268 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Based Compensation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  | 9,400,000 | 8,900,000 | 3,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense |  |  |  |  |  |  |  |  |  |  |  | 3,700,000 | 3,500,000 | 1,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Excess tax benefits from stock-based compensation |  |  |  |  |  |  |  |  |  |  |  | 1,138,000 | 2,652,000 | 1,125,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial Instruments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt | 886,835,000 |  |  |  |  |  |  | 250,224,000 |  |  |  | 886,835,000 | 250,224,000 |  |  |  |  |  |  |  |  |  |  | 340,000,000 | 286,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Fair Value | 275,000,000 |  |  |  |  |  |  |  |  |  |  | 275,000,000 |  |  |  |  |  |  |  |  |  |  |  | 341,700,000 | 282,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation |  |  |  |  |  |  |  |  |  |  |  | (14,502,000) | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency gains (losses) |  |  |  |  |  |  |  |  |  |  |  | 28,107,000 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Transaction Gain (Loss), Unrealized | $ 27,500,000 |  |  |  |  |  |  |  |  |  |  | $ 27,516,000 | $ 0 | $ 0 | $ 27,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Included in net income are $0.8 million in transaction costs in the second quarter of fiscal 2013, $8.3 million in transaction costs in the third quarter of fiscal 2013 and $14.2 million in the fourth quarter relating to the Terra Transaction, Rothsay Acquisition and the VION Acquisition.

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