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v3.26.1

Fair Value - Additional Information (Details) - USD ($) | 3 Months Ended
--- | ---
May 03, 2026 | May 04, 2025
Fair Value [Abstract] |  |
Other than temporary impairment on available for sale securities | $ 0 | $ 0

X
- Definition Other Than Temporary Impairment On Available For Sale Securities + References No definition available. + Details
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Namespace Prefix: | dlth_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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