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Goodwill | 6 Months Ended
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Jul. 02, 2016
Intangible Asset Disclosure Text Block [Abstract] |
Goodwill | Goodwill Changes in the carrying amount of goodwill (in thousands):
| Feed Ingredients | Food Ingredients | Fuel Ingredients | Total
Balance at January 2, 2016 |  |  |  |
Goodwill | $ | 812,797 |  | $ | 323,385 |  | $ | 112,834 |  | $ | 1,249,016 |
Accumulated impairment losses | (15,914 | ) | — |  | — |  | (15,914 | )
| 796,883 |  | 323,385 |  | 112,834 |  | 1,233,102 |
Goodwill acquired during year | 827 |  | — |  | 2 |  | 829 |
Foreign currency translation | 16,255 |  | 4,387 |  | 3,907 |  | 24,549 |
Balance at July 2, 2016 |  |  |  |  |  |  |
Goodwill | 829,879 |  | 327,772 |  | 116,743 |  | 1,274,394 |
Accumulated impairment losses | (15,914 | ) | — |  | — |  | (15,914 | )
| $ | 813,965 |  | $ | 327,772 |  | $ | 116,743 |  | $ | 1,258,480 |

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- Definition Intangible Asset Disclosure Text Block [Abstract] + References No definition available. + Details
Name: | dar_IntangibleAssetDisclosureTextBlockAbstract
Namespace Prefix: | dar_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The entire disclosure for goodwill. + References No definition available. + Details
Name: | us-gaap_GoodwillDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration