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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

Name:	dxlg_ManagementFeesRelatedPartiesExcludingReimbursementExpenses
Namespace Prefix:	dxlg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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

X

- 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

X

- Details

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