Long-Term Incentive Plans - Additional Information (Details)	9 Months Ended
Oct. 30, 2021 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Incentive plan performance targets covering period	3 years
Vesting terms	The performance period for each LTIP is three years. Awards for any achievement of performance targets will not be granted until the performance targets are achieved and then will be subject to additional vesting through August 31, 2022, August 31, 2023 and August, 31, 2024, respectively. The time-based awards under the 2019-2021 LTIP, 2020-2022 LTIP and 2021-2023 LTIP vest in four equal installments through April 1, 2023, April 1, 2024 and April 1, 2025, respectively.
2020-2022 LTIP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Accrued compensation expense	$ 1,300,000
Time Based Vesting Schedule
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage	50.00%
Time Based Vesting Schedule \| 2019-2021 LTIP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation cost incurred	$ 3,800,000
Stock compensation cost, period	44 months
Time Based Vesting Schedule \| 2020-2022 LTIP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation cost incurred	$ 3,800,000
Stock compensation cost, period	46 months
Time Based Vesting Schedule \| 2021-2023 LTIP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation cost incurred	$ 4,000,000.0
Stock compensation cost, period	49 months
Performance Based Vesting Schedule
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage	50.00%
Performance Based Vesting Schedule \| 2019-2021 LTIP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Accrued compensation expense	$ 1,900,000
Performance Based Vesting Schedule \| 2021-2023 LTIP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Accrued compensation expense	$ 600,000
RSUs \| 2019-2021 LTIP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage	50.00%
Stock Options \| 2020-2022 LTIP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage	50.00%
Stock Options \| 2021-2023 LTIP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage	25.00%
Cash \| 2019-2021 LTIP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage	50.00%
Cash \| 2020-2022 LTIP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage	50.00%
Cash \| 2021-2023 LTIP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage	75.00%

Share based compensation arrangement by share based payment award award performance targets covering period.

No definition available.

Name:	dxlg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardPerformanceTargetsCoveringPeriod
Namespace Prefix:	dxlg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Stock granted during period accrued.

+ References

No definition available.

+ Details

Name:	dxlg_StockGrantedDuringPeriodAccrued
Namespace Prefix:	dxlg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of service or performance condition required to be met for earning right to award under share-based payment arrangement. Includes, but is not limited to, combination of market, performance or service condition.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

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

- Definition

Percentage of vesting of award under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_PlanNameAxis=dxlg_TwoThousandTwentyToTwoThousandTwentyTwoLongTermIncentivePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=dxlg_TimeBasedVestingScheduleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=dxlg_TwoThousandNineteenToTwoThousandTwentyOneLongTermIncentivePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=dxlg_TwoThousandTwentyOneToTwoThousandTwentyThreeLongTermIncentivePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=dxlg_PerformanceBasedVestingScheduleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

Name:	us-gaap_CashAndCashEquivalentsAxis=us-gaap_CashMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: