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Accumulated Other Comprehensive Income (Loss) - Additional Information (Detail) (USD $)
0 Months Ended 1 Months Ended 3 Months Ended
Jan. 04, 2013
Jan. 31, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2013
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Loss on Contract Termination $ 28,000,000us-gaap_LossOnContractTermination          
Accumulated other comprehensive income (loss), net of tax       (84,983,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (57,190,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax  
Interest Rate Swap Contracts | Minimum            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Derivative instrument maturity year 2013          
Interest Rate Swap Contracts | Maximum            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Derivative instrument maturity year 2016          
Interest Rate Swap Contracts | 2017 Swaps Novated To WhiteWave            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Accumulated other comprehensive income (loss), before tax           (63,400,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1
/ us-gaap_DerivativeByNatureAxis
= df_TwentySeventeenSwapsNovatedToWhiteWaveMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Accumulated other comprehensive income (loss), net of tax           (38,900,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_DerivativeByNatureAxis
= df_TwentySeventeenSwapsNovatedToWhiteWaveMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Interest Rate Swap Contracts | Cash Flow Hedging            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Loss on Contract Termination   1,000,000,000us-gaap_LossOnContractTermination
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
       
Interest Expense [Member]            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Net change in value of derivative instruments     28,100,000us-gaap_LossOnDiscontinuationOfCashFlowHedgeDueToForecastedTransactionProbableOfNotOccurring
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember
     
Net change in value of derivative instruments, net of tax     $ (17,300,000)us-gaap_GainLossOnDiscontinuationOfCashFlowHedgeDueToForecastedTransactionProbableOfNotOccurringNet
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember