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Employee Benefit Plans (Details) (USD $)
3 Months Ended
Apr. 04, 2015
plan
Mar. 29, 2014
Jan. 01, 2011
Jan. 03, 2009
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Amount Company expects to contribute to its pension plans $ 7,500,000us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear      
Pension Contributions 1,600,000us-gaap_PensionContributions 5,200,000us-gaap_PensionContributions    
Multiemployer Plans [Abstract]        
Number Of Multiemployer Plans, Withdrawal Obligation Could Be Material 2dar_NumberOfMultiemployerPlansWithdrawalObligationCouldBeMaterial      
Number Of Multiemployer Plans Withdrawal Obligation Could Be Material Certified Red Zone 1dar_NumberOfMultiemployerPlansWithdrawalObligationCouldBeMaterialCertifiedRedZone      
Number of Multiemployer Plans, Certified Red Zone 4dar_NumberOfMultiemployerPlansCertifiedRedZone      
Number of Multiemployer Plans, Certified Yellow Zone 2dar_NumberOfMultiemployerPlansCertifiedYellowZone      
Number of Multiemployer Plans, Certified Orange Zone 1dar_NumberOfMultiemployerPlansCertifiedOrangeZone      
Accrued liability representing the present value of scheduled withdrawal liability payments for under-funded multi-employer plan 800,000us-gaap_MultiemployerPlansWithdrawalObligation   1,200,000us-gaap_MultiemployerPlansWithdrawalObligation 3,200,000us-gaap_MultiemployerPlansWithdrawalObligation
Maximum [Member]        
Multiemployer Plans [Abstract]        
Multiemployer Plan, Contributions To Individual Plan, Percent 5.00%dar_MultiemployerPlanContributionsToIndividualPlanPercent
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Pension Plan, Defined Benefit [Member]        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service cost 1,678,000us-gaap_DefinedBenefitPlanServiceCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
1,490,000us-gaap_DefinedBenefitPlanServiceCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
   
Interest cost 2,647,000us-gaap_DefinedBenefitPlanInterestCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
3,347,000us-gaap_DefinedBenefitPlanInterestCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
   
Expected return on plan assets (3,065,000)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
(3,608,000)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
   
Amortization of prior service cost (20,000)us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
4,000us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
   
Amortization of net loss 1,285,000us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
520,000us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
   
Net pension cost $ 2,525,000us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
$ 1,753,000us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember