XML 90 R71.htm IDEA: XBRL DOCUMENT
v3.20.1

Stockholders' equity and dividend payment, Series D Junior Participating Preferred stock (Details) - BW Group [Member] - shares |  | 3 Months Ended
--- | --- | ---
Mar. 23, 2017 | Jun. 30, 2017
Common Stock [Member] |  |
Series D junior participating preferred stock [Abstract] |  |
Preferred stock convertible to common stock (in shares) |  | 15,700,000
Series D junior participating preferred stock [Member] |  |
Series D junior participating preferred stock [Abstract] |  |
Number of shares converted to common stock (in shares) | 15,700 |

X
- Definition Total shares converted to common stock. + References No definition available. + Details
Name: | dht_NumberOfSharesConvertedToCommonStock
Namespace Prefix: | dht_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total shares converted to common stock. + References No definition available. + Details
Name: | dht_PreferredStockConvertibleToCommonStock
Namespace Prefix: | dht_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | dht_SeriesDJuniorParticipatingPreferredStockAbstract
Namespace Prefix: | dht_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=ifrs-full_OrdinarySharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BusinessCombinationsAxis=dht_BWGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=dht_SeriesDJuniorParticipatingPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |