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Debt - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended
Jul. 11, 2013
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 03, 2013
Jul. 25, 2013
Jul. 25, 2013
Dec. 31, 2014
Oct. 31, 2012
Sep. 30, 2013
Jul. 02, 2013
Aug. 31, 2014
Aug. 03, 2011
Dec. 16, 2010
Nov. 12, 2013
May 17, 2006
Feb. 29, 2012
Jun. 30, 2014
Debt Instrument [Line Items]                                      
Loans outstanding under the new senior secured credit facility interest rate 2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1                                    
Outstanding borrowings   $ 917,179,000us-gaap_LongTermDebt $ 917,179,000us-gaap_LongTermDebt           $ 917,179,000us-gaap_LongTermDebt                    
Cash proceeds from sale of operations     0us-gaap_ProceedsFromDivestitureOfBusinesses 0us-gaap_ProceedsFromDivestitureOfBusinesses 58,034,000us-gaap_ProceedsFromDivestitureOfBusinesses                            
Deferred financing cost written off     0us-gaap_WriteOffOfDeferredDebtIssuanceCost 6,791,000us-gaap_WriteOffOfDeferredDebtIssuanceCost 3,519,000us-gaap_WriteOffOfDeferredDebtIssuanceCost                            
Term loans aggregate principal amount 626,800,000us-gaap_ShortTermBankLoansAndNotesPayable                                    
Unamortized debt issuance costs   5,500,000us-gaap_DebtIssuanceCosts                                  
Loss on early retirement of debt   63,300,000us-gaap_GainsLossesOnExtinguishmentOfDebt 1,437,000us-gaap_GainsLossesOnExtinguishmentOfDebt 63,387,000us-gaap_GainsLossesOnExtinguishmentOfDebt 0us-gaap_GainsLossesOnExtinguishmentOfDebt                            
Net-tax loss on extinguishment of debt   38,700,000us-gaap_ExtinguishmentOfDebtGainLossNetOfTax                                  
Debt instrument tender premium   57,200,000us-gaap_DebtInstrumentUnamortizedPremium 57,200,000us-gaap_DebtInstrumentUnamortizedPremium           57,200,000us-gaap_DebtInstrumentUnamortizedPremium                    
Tender offer cost   600,000us-gaap_UnsolicitedTenderOfferCosts                                  
Senior Notes Due 2018                                      
Debt Instrument [Line Items]                                      
Debt instrument, principal amount retired   26,100,000us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2018Member		                                  
Loss on early retirement of debt   1,400,000us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2018Member		                                  
Debt instrument tender premium   1,200,000us-gaap_DebtInstrumentUnamortizedPremium
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2018Member		 1,200,000us-gaap_DebtInstrumentUnamortizedPremium
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2018Member		           1,200,000us-gaap_DebtInstrumentUnamortizedPremium
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2018Member		                    
Tender offer cost   200,000us-gaap_UnsolicitedTenderOfferCosts
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2018Member		                                  
Morningstar                                      
Debt Instrument [Line Items]                                      
Cash proceeds from sale of operations           1,450,000,000us-gaap_ProceedsFromDivestitureOfBusinesses
/ dei_LegalEntityAxis
= df_MorningstarMember		                          
WhiteWave Foods | Common Class A                                      
Debt Instrument [Line Items]                                      
Number of share for public offering             34,400,000.0us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
/ dei_LegalEntityAxis
= df_WhiteWaveFoodsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 34,400,000.0us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
/ dei_LegalEntityAxis
= df_WhiteWaveFoodsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		                      
Number of share for public offering price, per share             $ 17.75us-gaap_SharesIssuedPricePerShare
/ dei_LegalEntityAxis
= df_WhiteWaveFoodsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 $ 17.75us-gaap_SharesIssuedPricePerShare
/ dei_LegalEntityAxis
= df_WhiteWaveFoodsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		                      
WhiteWave Foods | Common Class A | IPO                                      
Debt Instrument [Line Items]                                      
Common stock shares exchanged for term loan               589,200,000us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ dei_LegalEntityAxis
= df_WhiteWaveFoodsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember		                      
Dean Foods Company                                      
Debt Instrument [Line Items]                                      
Loss on early retirement of debt     1,437,000us-gaap_GainsLossesOnExtinguishmentOfDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 63,387,000us-gaap_GainsLossesOnExtinguishmentOfDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		                              
Dean Foods Company | Senior Notes Due 2018                                      
Debt Instrument [Line Items]                                      
Debt instrument, principal amount                           400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2018Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2018Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		        
Debt instrument, maturity date     Dec. 15, 2018                                
Debt instrument, interest rate   0.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2018Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 0.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2018Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 9.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2018Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		         0.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2018Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		           9.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2018Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		        
Senior notes   0us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2018Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 0us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2018Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 23,812,000us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2018Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		         0us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2018Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		                    
Debt Instrument, purchase price, percentage of principal amount redeemed                 104.875%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2018Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		                    
Debt instrument, principal amount retired   23,800,000us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2018Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		                                  
Debt instrument repurchased face amount   24,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2018Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 24,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2018Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		           24,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2018Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		                    
Debt instrument repurchased amount       376,200,000us-gaap_DebtInstrumentRepurchaseAmount
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2018Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		                              
Call premium charges   54,000,000df_DebtInstrumentAssumedCallPremiumCharges
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2018Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		                                  
Dean Foods Company | Senior Notes Due 2016                                      
Debt Instrument [Line Items]                                      
Debt instrument, principal amount                                 500,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2016Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		    
Debt instrument, interest rate   7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2016Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2016Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2016Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		         7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2016Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		                    
Senior notes   475,819,000us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2016Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 475,819,000us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2016Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 475,579,000us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2016Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		         475,819,000us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2016Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		                    
Debt instrument repurchased face amount                               400,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2016Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		      
Debt instrument repurchased amount   23,800,000us-gaap_DebtInstrumentRepurchaseAmount
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2016Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 23,800,000us-gaap_DebtInstrumentRepurchaseAmount
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2016Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 23,800,000us-gaap_DebtInstrumentRepurchaseAmount
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2016Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		         23,800,000us-gaap_DebtInstrumentRepurchaseAmount
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2016Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		                    
Call premium charges   3,000,000df_DebtInstrumentAssumedCallPremiumCharges
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2016Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		                                  
Subsidiary debt obligations | Senior Notes Due 2017                                      
Debt Instrument [Line Items]                                      
Debt instrument, principal amount   142,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2017Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		 142,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2017Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		           142,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2017Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		                    
Debt instrument, maturity date     Oct. 15, 2017                                
Debt instrument, interest rate   6.90%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2017Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		 6.90%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2017Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		 6.90%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2017Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		         6.90%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2017Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		                    
Senior notes   134,913,000us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2017Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		 134,913,000us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2017Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		 132,808,000us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2017Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		         134,913,000us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= df_SeniorNotesDue2017Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		                    
Senior Secured Credit Facility                                      
Debt Instrument [Line Items]                                      
Percentage of guarantor's first tier foreign subsidiaries     65.00%df_DebtCovenantPercentageOfGuarantorsFirstTierForeignSubsidiaries
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		                                
Term Loan A                                      
Debt Instrument [Line Items]                                      
Debt instrument, principal amount   1,500,000,000.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= df_TermLoanAMember		 1,500,000,000.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= df_TermLoanAMember		           1,500,000,000.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= df_TermLoanAMember		                    
Term Of Debt, in years     5 years                                
Term Loan B                                      
Debt Instrument [Line Items]                                      
Debt instrument, principal amount   1,800,000,000.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= df_TermLoanBMember		 1,800,000,000.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= df_TermLoanBMember		           1,800,000,000.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= df_TermLoanBMember		                    
Term Of Debt, in years     7 years                                
Deferred financing cost written off                   1,500,000us-gaap_WriteOffOfDeferredDebtIssuanceCost
/ us-gaap_LongtermDebtTypeAxis
= df_TermLoanBMember		                  
Term Loan B | 2016 Tranche B Term Loan                                      
Debt Instrument [Line Items]                                      
Prepayment of outstanding borrowings           480,000,000us-gaap_RepaymentsOfSecuredDebt
/ us-gaap_DebtInstrumentAxis
= df_TwoThousandSixteenTrancheTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= df_TermLoanBMember		                          
Term Loan B | 2017 Tranche B Term Loan                                      
Debt Instrument [Line Items]                                      
Prepayment of outstanding borrowings           547,000,000us-gaap_RepaymentsOfSecuredDebt
/ us-gaap_DebtInstrumentAxis
= df_TwoThousandSeventeenTrancheTermLoanMember
/ us-gaap_LongtermDebtTypeAxis
= df_TermLoanBMember		                          
Term Loan One                                      
Debt Instrument [Line Items]                                      
Term loans aggregate principal amount 545,000,000us-gaap_ShortTermBankLoansAndNotesPayable
/ us-gaap_LongtermDebtTypeAxis
= df_TermLoanOneMember		                                    
Debt instrument, maturity date Aug. 12, 2013                                    
Term Loan Two                                      
Debt Instrument [Line Items]                                      
Term loans aggregate principal amount 81,800,000us-gaap_ShortTermBankLoansAndNotesPayable
/ us-gaap_LongtermDebtTypeAxis
= df_TermLoanTwoMember		                                    
2014 Tranche A Term Loan                                      
Debt Instrument [Line Items]                                      
Prepayment of outstanding borrowings                   480,000,000us-gaap_RepaymentsOfSecuredDebt
/ us-gaap_LongtermDebtTypeAxis
= df_TwentyFourteenTrancheATermLoanMember		                  
2014 Tranche B Term Loan                                      
Debt Instrument [Line Items]                                      
Prepayment of outstanding borrowings                   675,000,000us-gaap_RepaymentsOfSecuredDebt
/ us-gaap_LongtermDebtTypeAxis
= df_TwentyFourteenTrancheBTermLoanMember		                  
Senior Secured Revolving Credit Facility                                      
Debt Instrument [Line Items]                                      
Average daily balance under facility     52,100,000us-gaap_LineOfCreditFacilityAverageOutstandingAmount
/ us-gaap_LineOfCreditFacilityAxis
= df_SeniorSecuredRevolvingCreditFacilityMember		                                
Letters of credit outstanding amount   0us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_LineOfCreditFacilityAxis
= df_SeniorSecuredRevolvingCreditFacilityMember		 0us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_LineOfCreditFacilityAxis
= df_SeniorSecuredRevolvingCreditFacilityMember		           0us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_LineOfCreditFacilityAxis
= df_SeniorSecuredRevolvingCreditFacilityMember		                    
Term Of Debt, in years     5 years                                
Prepayment of outstanding borrowings           265,000,000us-gaap_RepaymentsOfSecuredDebt
/ us-gaap_LineOfCreditFacilityAxis
= df_SeniorSecuredRevolvingCreditFacilityMember		                          
Deferred financing cost written off                     5,400,000us-gaap_WriteOffOfDeferredDebtIssuanceCost
/ us-gaap_LineOfCreditFacilityAxis
= df_SeniorSecuredRevolvingCreditFacilityMember		                
Senior Secured Revolving Credit Facility | Letter of Credit                                      
Debt Instrument [Line Items]                                      
Line of credit facility, maximum borrowing capacity   350,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= df_SeniorSecuredRevolvingCreditFacilityMember		 350,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= df_SeniorSecuredRevolvingCreditFacilityMember		           350,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= df_SeniorSecuredRevolvingCreditFacilityMember		                    
Senior Secured Revolving Credit Facility | Prior Credit Facility                                      
Debt Instrument [Line Items]                                      
Line of credit facility, maximum borrowing capacity   1,500,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= df_PriorCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= df_SeniorSecuredRevolvingCreditFacilityMember		 1,500,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= df_PriorCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= df_SeniorSecuredRevolvingCreditFacilityMember		           1,500,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= df_PriorCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= df_SeniorSecuredRevolvingCreditFacilityMember		                    
Senior Secured Revolving Credit Facility | Swingline Loans                                      
Debt Instrument [Line Items]                                      
Line of credit facility, maximum borrowing capacity   150,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= df_SwinglineLoansMember
/ us-gaap_LineOfCreditFacilityAxis
= df_SeniorSecuredRevolvingCreditFacilityMember		 150,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= df_SwinglineLoansMember
/ us-gaap_LineOfCreditFacilityAxis
= df_SeniorSecuredRevolvingCreditFacilityMember		           150,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= df_SwinglineLoansMember
/ us-gaap_LineOfCreditFacilityAxis
= df_SeniorSecuredRevolvingCreditFacilityMember		                    
Five Year Senior Secured Credit Facility                                      
Debt Instrument [Line Items]                                      
Line of credit facility, maximum borrowing capacity                       750,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= df_FiveYearSeniorSecuredCreditFacilityMember		              
Debt instrument, maturity date                       Jul. 02, 2018              
Maximum permitted leverage ratio                       3.25df_MaximumPermittedLeverageRatio
/ us-gaap_LineOfCreditFacilityAxis
= df_FiveYearSeniorSecuredCreditFacilityMember		              
Five Year Senior Secured Credit Facility | Maximum                                      
Debt Instrument [Line Items]                                      
Potential change in borrowing capacity                       500,000,000us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet
/ us-gaap_LineOfCreditFacilityAxis
= df_FiveYearSeniorSecuredCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		              
Five Year Senior Secured Credit Facility | Minimum                                      
Debt Instrument [Line Items]                                      
Consolidated net leverage ratio, period one   3.00df_RatioOfIndebtednessToNetCapitalThresholdPeriodOne
/ us-gaap_LineOfCreditFacilityAxis
= df_FiveYearSeniorSecuredCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 3.00df_RatioOfIndebtednessToNetCapitalThresholdPeriodOne
/ us-gaap_LineOfCreditFacilityAxis
= df_FiveYearSeniorSecuredCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		           3.00df_RatioOfIndebtednessToNetCapitalThresholdPeriodOne
/ us-gaap_LineOfCreditFacilityAxis
= df_FiveYearSeniorSecuredCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		                    
Five Year Senior Secured Credit Facility | Letter of Credit                                      
Debt Instrument [Line Items]                                      
Line of credit facility, maximum borrowing capacity                       200,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= df_FiveYearSeniorSecuredCreditFacilityMember		              
Five Year Senior Secured Credit Facility | Swing Line Loan                                      
Debt Instrument [Line Items]                                      
Line of credit facility, maximum borrowing capacity                       150,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= df_SwingLineLoanMember
/ us-gaap_LineOfCreditFacilityAxis
= df_FiveYearSeniorSecuredCreditFacilityMember		              
Five Year Senior Secured Credit Facility | Libor Plus Margin                                      
Debt Instrument [Line Items]                                      
Loans outstanding under the new senior secured credit facility interest rate     2.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= df_LiborPlusMarginMember
/ us-gaap_LineOfCreditFacilityAxis
= df_FiveYearSeniorSecuredCreditFacilityMember		                                
Five Year Senior Secured Credit Facility | Libor Plus Margin | Maximum                                      
Debt Instrument [Line Items]                                      
Loans outstanding under the new senior secured credit facility interest rate                       2.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= df_LiborPlusMarginMember
/ us-gaap_LineOfCreditFacilityAxis
= df_FiveYearSeniorSecuredCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		              
Five Year Senior Secured Credit Facility | Libor Plus Margin | Minimum                                      
Debt Instrument [Line Items]                                      
Loans outstanding under the new senior secured credit facility interest rate                       1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= df_LiborPlusMarginMember
/ us-gaap_LineOfCreditFacilityAxis
= df_FiveYearSeniorSecuredCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		              
Five Year Senior Secured Credit Facility | Alternate Base Rate Plus Margin                                      
Debt Instrument [Line Items]                                      
Loans outstanding under the new senior secured credit facility interest rate     1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= df_AlternateBaseRatePlusMarginMember
/ us-gaap_LineOfCreditFacilityAxis
= df_FiveYearSeniorSecuredCreditFacilityMember		                                
Five Year Senior Secured Credit Facility | Alternate Base Rate Plus Margin | Maximum                                      
Debt Instrument [Line Items]                                      
Loans outstanding under the new senior secured credit facility interest rate                       1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= df_AlternateBaseRatePlusMarginMember
/ us-gaap_LineOfCreditFacilityAxis
= df_FiveYearSeniorSecuredCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		              
Five Year Senior Secured Credit Facility | Alternate Base Rate Plus Margin | Minimum                                      
Debt Instrument [Line Items]                                      
Loans outstanding under the new senior secured credit facility interest rate                       0.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= df_AlternateBaseRatePlusMarginMember
/ us-gaap_LineOfCreditFacilityAxis
= df_FiveYearSeniorSecuredCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		              
Amended Senior Secured Revolving Credit Facility | Senior Secured Credit Facility                                      
Debt Instrument [Line Items]                                      
Unamortized debt issuance costs                         1,000,000us-gaap_DebtIssuanceCosts
/ us-gaap_LineOfCreditFacilityAxis
= df_AmendedSeniorSecuredRevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		            
Receivables Securitization Facility                                      
Debt Instrument [Line Items]                                      
Average daily balance under facility     249,600,000us-gaap_LineOfCreditFacilityAverageOutstandingAmount
/ us-gaap_LineOfCreditFacilityAxis
= df_ReceivablesSecuritizationFacilityMember		                                
Line of credit, current borrowing capacity   550,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= df_ReceivablesSecuritizationFacilityMember		 550,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= df_ReceivablesSecuritizationFacilityMember		           550,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= df_ReceivablesSecuritizationFacilityMember		                    
Line of credit, amount outstanding   163,800,000us-gaap_LineOfCreditFacilityAmountOutstanding
/ us-gaap_LineOfCreditFacilityAxis
= df_ReceivablesSecuritizationFacilityMember		 163,800,000us-gaap_LineOfCreditFacilityAmountOutstanding
/ us-gaap_LineOfCreditFacilityAxis
= df_ReceivablesSecuritizationFacilityMember		           163,800,000us-gaap_LineOfCreditFacilityAmountOutstanding
/ us-gaap_LineOfCreditFacilityAxis
= df_ReceivablesSecuritizationFacilityMember		                    
Line of credit facility outstanding, remaining borrowing capacity   151,200,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= df_ReceivablesSecuritizationFacilityMember		 151,200,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= df_ReceivablesSecuritizationFacilityMember		           151,200,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= df_ReceivablesSecuritizationFacilityMember		                    
Total receivables sold     685,500,000df_TotalAccountsReceivableSoldGross
/ us-gaap_LineOfCreditFacilityAxis
= df_ReceivablesSecuritizationFacilityMember		                                
Issuance of standby letter of credit   37,700,000df_StandbyLetterOfCreditIssuedForLitigationSettlement
/ us-gaap_LineOfCreditFacilityAxis
= df_ReceivablesSecuritizationFacilityMember		 37,700,000df_StandbyLetterOfCreditIssuedForLitigationSettlement
/ us-gaap_LineOfCreditFacilityAxis
= df_ReceivablesSecuritizationFacilityMember		           37,700,000df_StandbyLetterOfCreditIssuedForLitigationSettlement
/ us-gaap_LineOfCreditFacilityAxis
= df_ReceivablesSecuritizationFacilityMember		                 80,000,000df_StandbyLetterOfCreditIssuedForLitigationSettlement
/ us-gaap_LineOfCreditFacilityAxis
= df_ReceivablesSecuritizationFacilityMember		  
Receivables Securitization Facility | Letter of Credit                                      
Debt Instrument [Line Items]                                      
Line of credit facility, maximum borrowing capacity   350,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= df_ReceivablesSecuritizationFacilityMember		 350,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= df_ReceivablesSecuritizationFacilityMember		           350,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= df_ReceivablesSecuritizationFacilityMember		                   300,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= df_ReceivablesSecuritizationFacilityMember
Amendment To Five Year Senior Secured Credit Facility | Maximum                                      
Debt Instrument [Line Items]                                      
Maximum consolidated net leverage ratio, prior to December 31, 2014   5.25df_RatioOfIndebtednessToNetCapitalThresholdPeriodThree
/ us-gaap_LineOfCreditFacilityAxis
= df_AmendmentToFiveYearSeniorSecuredCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 5.25df_RatioOfIndebtednessToNetCapitalThresholdPeriodThree
/ us-gaap_LineOfCreditFacilityAxis
= df_AmendmentToFiveYearSeniorSecuredCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		           5.25df_RatioOfIndebtednessToNetCapitalThresholdPeriodThree
/ us-gaap_LineOfCreditFacilityAxis
= df_AmendmentToFiveYearSeniorSecuredCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		                    
Maximum consolidated net leverage ratio, prior to March 31, 2015   5.00df_RatioOfIndebtednessToNetCapitalThresholdPeriodFour
/ us-gaap_LineOfCreditFacilityAxis
= df_AmendmentToFiveYearSeniorSecuredCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 5.00df_RatioOfIndebtednessToNetCapitalThresholdPeriodFour
/ us-gaap_LineOfCreditFacilityAxis
= df_AmendmentToFiveYearSeniorSecuredCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		           5.00df_RatioOfIndebtednessToNetCapitalThresholdPeriodFour
/ us-gaap_LineOfCreditFacilityAxis
= df_AmendmentToFiveYearSeniorSecuredCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		                    
Maximum consolidated net leverage ratio, prior to June 30, 2015   4.50df_RatioOfIndebtednessToNetCapitalThresholdPeriodFive
/ us-gaap_LineOfCreditFacilityAxis
= df_AmendmentToFiveYearSeniorSecuredCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 4.50df_RatioOfIndebtednessToNetCapitalThresholdPeriodFive
/ us-gaap_LineOfCreditFacilityAxis
= df_AmendmentToFiveYearSeniorSecuredCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		           4.50df_RatioOfIndebtednessToNetCapitalThresholdPeriodFive
/ us-gaap_LineOfCreditFacilityAxis
= df_AmendmentToFiveYearSeniorSecuredCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		                    
Maximum consolidated net leverage ratio, after June 30, 2015   4.00df_RatioOfIndebtednessToNetCapitalThresholdPeriodSix
/ us-gaap_LineOfCreditFacilityAxis
= df_AmendmentToFiveYearSeniorSecuredCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 4.00df_RatioOfIndebtednessToNetCapitalThresholdPeriodSix
/ us-gaap_LineOfCreditFacilityAxis
= df_AmendmentToFiveYearSeniorSecuredCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		           4.00df_RatioOfIndebtednessToNetCapitalThresholdPeriodSix
/ us-gaap_LineOfCreditFacilityAxis
= df_AmendmentToFiveYearSeniorSecuredCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		                    
Maximum senior secured net leverage ratio   2.50df_RatioOfIndebtednessToSeniorSecuredDebtThreshold
/ us-gaap_LineOfCreditFacilityAxis
= df_AmendmentToFiveYearSeniorSecuredCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 2.50df_RatioOfIndebtednessToSeniorSecuredDebtThreshold
/ us-gaap_LineOfCreditFacilityAxis
= df_AmendmentToFiveYearSeniorSecuredCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		           2.50df_RatioOfIndebtednessToSeniorSecuredDebtThreshold
/ us-gaap_LineOfCreditFacilityAxis
= df_AmendmentToFiveYearSeniorSecuredCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		                    
New Senior Secured Credit Facilities                                      
Debt Instrument [Line Items]                                      
Fees in connection with the new senior secured credit facility                       $ 6,000,000us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_LineOfCreditFacilityAxis
= df_NewSeniorSecuredCreditFacilitiesMember		              
Amortization period of issuance cost                       5 years              
Short Term Credit Facilities | Maximum                                      
Debt Instrument [Line Items]                                      
Consolidated net leverage ratio, period one 4.00df_RatioOfIndebtednessToNetCapitalThresholdPeriodOne
/ us-gaap_LineOfCreditFacilityAxis
= df_ShortTermCreditFacilitiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		                                    
Short Term Credit Facilities | Minimum                                      
Debt Instrument [Line Items]                                      
Consolidated interest coverage ratio 3.00df_ConsolidatedInterestCoverageRatio
/ us-gaap_LineOfCreditFacilityAxis
= df_ShortTermCreditFacilitiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember