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v3.19.1

Summary of Significant Accounting Policies - Changes in Carrying Value of Intangible Assets (Parenthetical) (Details) | 12 Months Ended
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Feb. 02, 2019
Other Intangible Assets |
Intangible Assets By Major Class [Line Items] |
Intangible assets, estimated useful life | 16 years

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- Definition Intangible assets by major class. + References No definition available. + Details
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Namespace Prefix: | dxlg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_OtherIntangibleAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |