Delayed single draw term loan

No definition available.

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

Long-Term Obligations and Notes Payable - Extinguished Obligations (Details) $ in Millions		3 Months Ended
	Mar. 30, 2018 USD ($)	Mar. 31, 2018	Mar. 31, 2019 USD ($)	Jun. 30, 2018 USD ($)	Mar. 30, 2018 CAD ($)	Mar. 27, 2014 USD ($)
Line of credit \| Alon Partnership Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 240,000,000.0
Term loan
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 693,000,000.0
Face amount of debt	700,000,000.0
Term loan \| Alon Term Loan Credit Facilities
Debt Instrument [Line Items]
Face amount of debt	250,000,000.0
Term loan \| Alon Term Loan Credit Facilities \| Eurodollar [Member]
Debt Instrument [Line Items]
Basis spread (as percent)		1.25%
Term loan \| Alon Energy Term Loan [Member]
Debt Instrument [Line Items]
Face amount of debt						$ 25,000,000.0
Term loan \| New Alon Energy Term Loan [Member]
Debt Instrument [Line Items]
Face amount of debt						$ 38,000,000.0
Term loan \| Along Asphalt Term Loan [Member]
Debt Instrument [Line Items]
Face amount of debt	35,000,000.0
Term loan \| Alon Retail Credit Facilities
Debt Instrument [Line Items]
Face amount of debt				$ 110,000,000.0
Revolving credit facility \| Line of credit
Debt Instrument [Line Items]
Maximum borrowing capacity	1,000,000,000.0				$ 50.0
Revolving credit facility \| Line of credit \| Wells Revolving Loan
Debt Instrument [Line Items]
Maximum borrowing capacity	450,000,000.0
Revolving credit facility \| Line of credit \| Wells Term Loan
Debt Instrument [Line Items]
Delayed single draw term loan	70,000,000
Revolving credit facility \| Line of credit \| Alon Retail Credit Facilities
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 10,000,000.0
Term loan facility \| Term loan \| Lion Term Loan Facility
Debt Instrument [Line Items]
Face amount of debt	$ 275,000,000.0
Term loan facility \| Term loan \| Lion Term Loan Facility \| Interest Rate Floor [Member]
Debt Instrument [Line Items]
Basis spread (as percent)	5.50%