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Goodwill (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Jan. 03, 2015 | Dec. 28, 2013
Goodwill [Roll Forward] |  |
Goodwill at beginning of year | $ 717,551 us-gaap_GoodwillGross | $ 397,283 us-gaap_GoodwillGross
Accumulated impairment losses at beginning of year | (15,914)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | (15,914)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Goodwill at beginning of year | 701,637 us-gaap_Goodwill | 381,369 us-gaap_Goodwill
Goodwill acquired during year | 705,328 us-gaap_GoodwillAcquiredDuringPeriod | 326,669 us-gaap_GoodwillAcquiredDuringPeriod
Translation | (86,546)us-gaap_GoodwillTranslationAdjustments | (6,401)us-gaap_GoodwillTranslationAdjustments
Goodwill at end of year | 1,336,333 us-gaap_GoodwillGross | 717,551 us-gaap_GoodwillGross
Accumulated impairment losses at end of year | (15,914)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | (15,914)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Goodwill at end of year | 1,320,419 us-gaap_Goodwill | 701,637 us-gaap_Goodwill
Feed Ingredients [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill at beginning of year | 679,811 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = dar_FeedIngredientsMember | 396,807 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = dar_FeedIngredientsMember
Accumulated impairment losses at beginning of year | (15,914)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = dar_FeedIngredientsMember | (15,914)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = dar_FeedIngredientsMember
Goodwill at beginning of year | 663,897 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dar_FeedIngredientsMember | 380,893 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dar_FeedIngredientsMember
Goodwill acquired during year | 225,889 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = dar_FeedIngredientsMember | 288,471 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = dar_FeedIngredientsMember
Translation | (42,192)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = dar_FeedIngredientsMember | (5,467)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = dar_FeedIngredientsMember
Goodwill at end of year | 863,508 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = dar_FeedIngredientsMember | 679,811 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = dar_FeedIngredientsMember
Accumulated impairment losses at end of year | (15,914)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = dar_FeedIngredientsMember | (15,914)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = dar_FeedIngredientsMember
Goodwill at end of year | 847,594 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dar_FeedIngredientsMember | 663,897 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dar_FeedIngredientsMember
Food Ingredients [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill at beginning of year | 0 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = dar_FoodIngredientsMember | 0 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = dar_FoodIngredientsMember
Accumulated impairment losses at beginning of year | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = dar_FoodIngredientsMember | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = dar_FoodIngredientsMember
Goodwill at beginning of year | 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dar_FoodIngredientsMember | 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dar_FoodIngredientsMember
Goodwill acquired during year | 375,633 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = dar_FoodIngredientsMember | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = dar_FoodIngredientsMember
Translation | (29,480)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = dar_FoodIngredientsMember | 0 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = dar_FoodIngredientsMember
Goodwill at end of year | 346,153 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = dar_FoodIngredientsMember | 0 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = dar_FoodIngredientsMember
Accumulated impairment losses at end of year | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = dar_FoodIngredientsMember | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = dar_FoodIngredientsMember
Goodwill at end of year | 346,153 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dar_FoodIngredientsMember | 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dar_FoodIngredientsMember
Fuel Ingredients [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill at beginning of year | 37,740 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = dar_FuelIngredientsMember | 476 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = dar_FuelIngredientsMember
Accumulated impairment losses at beginning of year | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = dar_FuelIngredientsMember | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = dar_FuelIngredientsMember
Goodwill at beginning of year | 37,740 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dar_FuelIngredientsMember | 476 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dar_FuelIngredientsMember
Goodwill acquired during year | 103,806 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = dar_FuelIngredientsMember | 38,198 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = dar_FuelIngredientsMember
Translation | (14,874)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = dar_FuelIngredientsMember | (934)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = dar_FuelIngredientsMember
Goodwill at end of year | 0 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = dar_FuelIngredientsMember | 37,740 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = dar_FuelIngredientsMember
Accumulated impairment losses at end of year | (126,672)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = dar_FuelIngredientsMember | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = dar_FuelIngredientsMember
Goodwill at end of year | $ 126,672 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dar_FuelIngredientsMember | $ 37,740 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dar_FuelIngredientsMember

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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