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Revenue Recognition - Additional Information (Details) $ in Millions	3 Months Ended
	May 02, 2020 USD ($) Segment	Feb. 01, 2020 USD ($)
Revenue From Contract With Customer [Abstract]
Gift card liability, net of breakage	$ 1.2	$ 2.7
Percentage of customers participate in loyalty program	90.00%
Loyalty accrual, net of breakage	$ 1.9	$ 1.0
Number of reportable segments | Segment	1

X

- Definition

Gift card liability net of breakage.

+ References

No definition available.

+ Details

Name:	dxlg_GiftCardLiabilityNetOfBreakage
Namespace Prefix:	dxlg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Loyalty accrual net of breakage current.

+ References

No definition available.

+ Details

Name:	dxlg_LoyaltyAccrualNetOfBreakageCurrent
Namespace Prefix:	dxlg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Percentage of customers participate in loyalty program.

+ References

No definition available.

+ Details

Name:	dxlg_PercentageOfCustomersParticipateInLoyaltyProgram
Namespace Prefix:	dxlg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration