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Stockholders equity and dividend payment - Dividend payment (Details) - USD ($)	3 Months Ended								9 Months Ended	12 Months Ended
	Nov. 14, 2019	Aug. 29, 2019	May 28, 2019	Feb. 26, 2019	Nov. 23, 2018	Aug. 31, 2018	May 30, 2018	Feb. 28, 2018	Sep. 30, 2019	Dec. 30, 2018
Dividend Payment [Abstract]
Payment		$ 2,800,000	$ 11,400,000	$ 7,100,000	$ 2,900,000	$ 2,900,000	$ 2,900,000	$ 2,900,000
Total Payment									$ 21,300,000	$ 11,500,000
Per common share	$ 0.05	$ 0.02	$ 0.08	$ 0.05	$ 0.02	$ 0.02	$ 0.02	$ 0.02	$ 0.15	$ 0.08

X

- Definition

The amount of dividends recognised as distributions to owners.

+ References

No definition available.

+ Details

Name:	dht_DividendPayment
Namespace Prefix:	dht_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Disclosure of dividend payments.

+ References

No definition available.

+ Details

Name:	dht_DividendPaymentAbstract
Namespace Prefix:	dht_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The annual amount of dividends recognised as distributions to owners.

+ References

No definition available.

+ Details

Name:	dht_TotalDividendPayment
Namespace Prefix:	dht_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of dividends paid per ordinary share.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 34
-IssueDate 2019-01-01
-Paragraph 16A
-Subparagraph f
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=34&code=ifrs-tx-2019-en-r&anchor=para_16A_f&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_DividendsPaidOrdinarySharesPerShare
Namespace Prefix:	ifrs-full_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration