Debt Instrument, Repaid And Outstanding

No definition available.

Name:	dk_DebtInstrumentRepaidAndOutstanding
Namespace Prefix:	dk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Delayed single draw term loan

+ References

No definition available.

+ Details

Name:	dk_Delayedsingledrawtermloan
Namespace Prefix:	dk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentAxis=dk_WellsRevolvingLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=dk_AlongAsphaltTermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=dk_AlonRetailCreditFacilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=dk_LionTermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=dk_AlonPartnershipCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=dk_AlonTermLoanCreditFacilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_EurodollarMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=dk_NewAlonEnergyTermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=dk_WellsTermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=dk_TermLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_InterestRateFloorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Long-Term Obligations and Notes Payable - Extinguished Obligations Narrative (Details)	Mar. 30, 2018 USD ($)	Dec. 31, 2019 USD ($)	Mar. 30, 2018 CAD ($)	Mar. 29, 2018 USD ($)	Dec. 29, 2017 USD ($)
Debt Instrument [Line Items]
Debt Instrument, Repaid And Outstanding	$ 608,400,000
Wells Revolving Loan
Debt Instrument [Line Items]
Debt Instrument, Repaid And Outstanding	40,800,000
Along Asphalt Term Loan
Debt Instrument [Line Items]
Debt Instrument, Repaid And Outstanding				$ 35,000,000.0
Alon Retail Credit Facilities
Debt Instrument [Line Items]
Debt Instrument, Repaid And Outstanding	86,400,000
Lion Term Loan
Debt Instrument [Line Items]
Debt Instrument, Repaid And Outstanding	206,300,000
Alon Partnership Credit Facility
Debt Instrument [Line Items]
Debt Instrument, Repaid And Outstanding	236,900,000
Alon Term Loan Credit Facilities
Debt Instrument [Line Items]
Debt Instrument, Repaid And Outstanding	38,000,000.0
Line of Credit \| Alon Partnership Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	240,000,000.0
Secured Debt
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 1,085,500,000
Debt instrument, face amount	700,000,000.0
Secured Debt \| Along Asphalt Term Loan
Debt Instrument [Line Items]
Debt instrument, face amount	35,000,000.0
Secured Debt \| Alon Retail Credit Facilities
Debt Instrument [Line Items]
Debt instrument, face amount	110,000,000.0
Secured Debt \| Alon Term Loan Credit Facilities
Debt Instrument [Line Items]
Debt instrument, face amount	$ 250,000,000.0
Secured Debt \| Alon Term Loan Credit Facilities \| Eurodollar
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.25%
Secured Debt \| New Alon Energy Term Loan
Debt Instrument [Line Items]
Debt instrument, face amount					$ 38,000,000.0
Revolving Credit Facility \| Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 1,000,000,000.0		$ 50,000,000.0
Revolving Credit Facility \| Line of Credit \| Wells Revolving Loan
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	450,000,000.0
Revolving Credit Facility \| Line of Credit \| Alon Retail Credit Facilities
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	10,000,000.0
Revolving Credit Facility \| Line of Credit \| Wells Term Loan
Debt Instrument [Line Items]
Delayed single draw term loan	70,000,000
Term loan facility \| Secured Debt \| Lion Term Loan
Debt Instrument [Line Items]
Debt instrument, face amount	$ 275,000,000.0
Term loan facility \| Secured Debt \| Lion Term Loan \| Interest Rate Floor
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	5.50%