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General accounting principles (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Disclosure of expected impact of initial application of new standards or interpretations [abstract]
Lease liability (Other non-current liabilities)	$ 2,194
Lease liability (Other current liabilities)	565
Right-of-use asset (Other property, plant and equipment)	$ 2,732

X

- Definition

The amount of current lease liabilities that the entity does not separately disclose in the same statement or note.

+ References

No definition available.

+ Details

Name:	dht_OtherCurrentLeaseLiabilities
Namespace Prefix:	dht_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of non-current lease liabilities that the entity does not separately disclose in the same statement or note.

+ References

No definition available.

+ Details

Name:	dht_OtherNoncurrentLeaseLiabilities
Namespace Prefix:	dht_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	ifrs-full_DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2019-01-01
-Paragraph 53
-Subparagraph j
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_j&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_RightofuseAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant