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

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- Definition Effective Income Tax Rate Reconciliation, Sub-Part F, Amount + References No definition available. + Details
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- Definition Income Tax Reconciliation Biofuel Tax Refunds + References No definition available. + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32123-109318 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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