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Other Comprehensive Income (Schedule of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (loss) December 31, 2016, attributable to Darling, net of tax			$ (340,006)
Other comprehensive gain before reclassifications			64,288
Amounts reclassified from accumulated other comprehensive income/(loss)			51
Net current-period other comprehensive income	$ 49,003	$ (6,130)	64,339	$ 51,421
Noncontrolling interest			(2,919)
Accumulated Other Comprehensive Income (loss) July 1, 2017, attributable to Darling, net of tax	(272,748)		(272,748)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (loss) December 31, 2016, attributable to Darling, net of tax			(308,910)
Other comprehensive gain before reclassifications			64,791
Amounts reclassified from accumulated other comprehensive income/(loss)			0
Net current-period other comprehensive income			64,791
Noncontrolling interest			(2,919)
Accumulated Other Comprehensive Income (loss) July 1, 2017, attributable to Darling, net of tax	(241,200)		(241,200)
Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (loss) December 31, 2016, attributable to Darling, net of tax			2,468
Other comprehensive gain before reclassifications			(503)
Amounts reclassified from accumulated other comprehensive income/(loss)			(1,468)
Net current-period other comprehensive income			(1,971)
Noncontrolling interest			0
Accumulated Other Comprehensive Income (loss) July 1, 2017, attributable to Darling, net of tax	497		497
Defined Benefit Pension Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (loss) December 31, 2016, attributable to Darling, net of tax			(33,564)
Other comprehensive gain before reclassifications			0
Amounts reclassified from accumulated other comprehensive income/(loss)			1,519
Net current-period other comprehensive income			1,519
Noncontrolling interest			0
Accumulated Other Comprehensive Income (loss) July 1, 2017, attributable to Darling, net of tax	$ (32,045)		$ (32,045)

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Accumulated Other Comprehensive Income (Loss) [Roll Forward]

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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