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Stockholders equity and dividend payment, Stock repurchase (Details)	3 Months Ended
	Sep. 30, 2020 shares
Stock repurchase [Abstract]
Share repurchases (in shares)	0

X

- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

No definition available.

+ Details

Name:	dht_PurchaseOfTreasuryStock
Namespace Prefix:	dht_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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