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Related Parties - Additional Information (Details) - Chief Marketing Officer - USD ($) |  | 3 Months Ended
--- | --- | ---
Aug. 17, 2017 | Oct. 28, 2017
Related Party Transaction [Line Items] |  |
Compensation to related party, per week | $ 7,000 |
Compensation to related party, excluding reimbursement expenses |  | $ 70,000

X
- Definition Management fees related parties excluding reimbursement expenses. + References No definition available. + Details
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Namespace Prefix: | dxlg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Management fees related parties per week. + References No definition available. + Details
Name: | dxlg_ManagementFeesRelatedPartiesPerWeek
Namespace Prefix: | dxlg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=dxlg_ChiefMarketingOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |