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Retirement Plan (Narrative) (Details) - 401(k) profit sharing plan [Member] - USD ($) $ in Millions | 12 Months Ended
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Jan. 31, 2016 | Feb. 01, 2015 | Feb. 02, 2014
Profit sharing contributions percent on eligible wages | 0.00% | 0.00% | 5.00%
Total expenses under the retirement plan | $ 0.5 | $ 0.4 | $ 0.6
Contribution on 3% of Participant Compensation [Member] |  |  |
Quarterly employer matching contribution percent of match | 100.00% |  |
Contribution on 2% of Participant Compensation [Member] |  |  |
Quarterly employer matching contribution percent of match | 50.00% |  |
Employer Matching Contribution 100% [Member] |  |  |
Participant percentage contribution to the plan | 3.00% |  |
Employer Matching Contribution 50% [Member] |  |  |
Participant percentage contribution to the plan | 2.00% |  |

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- Definition Defined Contribution Plan Profit Sharing Contributions Percent + References No definition available. + Details
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Namespace Prefix: | dlth_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of administrative expenses incurred by a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanAdministrativeExpenses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementScenarioAxis=dlth_ContributionOnFirstThreePercentOfParticipantCompensationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |