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Other Comprehensive Income (Schedule of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 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			108,707
Amounts reclassified from accumulated other comprehensive income/(loss)			3,474
Net current-period other comprehensive income	$ 47,842	$ (4,378)	112,181	$ 47,043
Noncontrolling interest			(3,733)
Accumulated Other Comprehensive Income (loss) September 30, 2017, attributable to Darling, net of tax	(224,092)		(224,092)
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			111,002
Amounts reclassified from accumulated other comprehensive income/(loss)			0
Net current-period other comprehensive income			111,002
Noncontrolling interest			(3,733)
Accumulated Other Comprehensive Income (loss) September 30, 2017, attributable to Darling, net of tax	(194,175)		(194,175)
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			(2,295)
Amounts reclassified from accumulated other comprehensive income/(loss)			1,196
Net current-period other comprehensive income			(1,099)
Noncontrolling interest			0
Accumulated Other Comprehensive Income (loss) September 30, 2017, attributable to Darling, net of tax	1,369		1,369
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)			2,278
Net current-period other comprehensive income			2,278
Noncontrolling interest			0
Accumulated Other Comprehensive Income (loss) September 30, 2017, attributable to Darling, net of tax	$ (31,286)		$ (31,286)

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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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