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Income Taxes Income Taxes - Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Computed expected tax expense	$ 28,508us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 57,287us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 72,375us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal benefit	228us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	5,017us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	7,124us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Section 199 qualified domestic production deduction	0us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities	619us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities	4,830us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities
Change in valuation allowance	5,420us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	507us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	254us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Non-deductible compensation expenses	1,622us-gaap_IncomeTaxReconciliationNondeductibleExpense	106us-gaap_IncomeTaxReconciliationNondeductibleExpense	253us-gaap_IncomeTaxReconciliationNondeductibleExpense
Deferred tax on unremitted foreign earnings	1,956us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings	0us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings	0us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings
Sub-Part F income	3,786dar_EffectiveIncomeTaxRateReconciliationSubPartFAmount	0dar_EffectiveIncomeTaxRateReconciliationSubPartFAmount	0dar_EffectiveIncomeTaxRateReconciliationSubPartFAmount
Foreign rate differential	(9,754)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	694us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	0us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Biofuel tax incentives	(22,546)dar_IncomeTaxReconciliationBiofuelTaxRefunds	(9,342)dar_IncomeTaxReconciliationBiofuelTaxRefunds	0dar_IncomeTaxReconciliationBiofuelTaxRefunds
Non-deductible transaction costs	4,107us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther	996us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther	0us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther
Other, net	(186)us-gaap_IncomeTaxReconciliationOtherAdjustments	65us-gaap_IncomeTaxReconciliationOtherAdjustments	839us-gaap_IncomeTaxReconciliationOtherAdjustments
Income Tax Expense (Benefit)	$ 13,141us-gaap_IncomeTaxExpenseBenefit	$ 54,711us-gaap_IncomeTaxExpenseBenefit	$ 76,015us-gaap_IncomeTaxExpenseBenefit

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Effective Income Tax Rate Reconciliation, Sub-Part F, Amount

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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