Earnings per Share - Potential Common Stock Equivalents Excluded From Computation of Diluted Earning Per Share (Details) - $ / shares shares in Thousands	3 Months Ended
May 04, 2019	May 05, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti dilutive shares	525	377
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti dilutive shares	942	1,242
Range of exercise prices of such options, minimum	$ 2.00	$ 1.85
Range of exercise prices of such options, maximum	$ 7.02	$ 7.02
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti dilutive shares	1,105	316
Restricted and Deferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti dilutive shares	39	65

Antidilutive securities excluded from computation of earnings per share exercise price range lower limit.

No definition available.

Name:	dxlg_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareExercisePriceRangeLowerLimit
Namespace Prefix:	dxlg_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Antidilutive securities excluded from computation of earnings per share exercise price range upper limit.

+ References

No definition available.

+ Details

Name:	dxlg_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareExercisePriceRangeUpperLimit
Namespace Prefix:	dxlg_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

+ Details

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

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

- Details

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis=dxlg_RestrictedAndDeferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: