Debt instrument consolidated fixed coverage ratio.

No definition available.

Name:	dxlg_DebtInstrumentConsolidatedFixedCoverageRatio
Namespace Prefix:	dxlg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The average unused portion of a line of credit that is available to the borrower to withdrawn upon.

+ References

No definition available.

+ Details

Name:	dxlg_LineOfCreditFacilityAverageUnusedExcessAvailability
Namespace Prefix:	dxlg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Potential to increase to maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

No definition available.

+ Details

Name:	dxlg_LineOfCreditFacilityIncreaseToMaximumBorrowingCapacity
Namespace Prefix:	dxlg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Minimum excess available amount percentage to pursuant credit facility.

+ References

No definition available.

+ Details

Name:	dxlg_MinimumExcessAvailableAmountPercentageToPursuantCreditFacility
Namespace Prefix:	dxlg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum excess available amount to pursuant credit facility.

+ References

No definition available.

+ Details

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

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after accumulated amortization, of debt discount.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

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

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Average amount borrowed under the credit facility during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityAverageOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The effective interest rate at the end of the reporting period.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=dxlg_CreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_PrimeRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=dxlg_FederalFundsRateMember
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Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=dxlg_CommercialAndStandbyLetterOfCreditsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=dxlg_SwinglineLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=dxlg_DocumentaryLettersOfCreditMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=dxlg_FILOLoanMember
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Debt - Additional Information (Details) - USD ($)		3 Months Ended
Debt - Additional Information (Details) - USD ($)	May 24, 2018	May 04, 2019	May 05, 2018	Feb. 02, 2019
Debt Instrument [Line Items]
Unamortized debt issuance costs		$ 229,000		$ 243,000
Credit Facility
Debt Instrument [Line Items]
Line of credit facility, amount outstanding	$ 140,000,000	64,600,000
Line of credit facility, maximum borrowing capacity	125,000,000
Line of credit facility, potential maximum borrowing capacity	$ 50,000,000
Minimum loan cap percentage	10.00%
Line of credit facility	$ 7,500,000
Unamortized debt issuance costs		300,000
Line of credit facility, remaining borrowing capacity		32,300,000
Line of credit facility, average monthly outstanding amount		56,400,000
Line of credit facility, average unused excess availability		$ 38,800,000
Unused line fee		0.25%
Credit Facility \| LIBOR-based Borrowings
Debt Instrument [Line Items]
Line of credit facility, amount outstanding		$ 56,000,000
Line of credit facility interest rate		3.69%
Line of credit facility, expiration date		May 06, 2019
Credit Facility \| Prime-based Borrowings
Debt Instrument [Line Items]
Line of credit facility interest rate		5.75%
Credit Facility \| Minimum
Debt Instrument [Line Items]
Debt instrument consolidated fixed coverage ratio	100.00%
Credit Facility \| Minimum \| Federal Funds Rate
Debt Instrument [Line Items]
Line of credit facility, basis spread on variable rate			0.25%
Credit Facility \| Minimum \| LIBOR-based Borrowings
Debt Instrument [Line Items]
Line of credit facility, basis spread on variable rate			1.25%
Credit Facility \| Maximum \| Federal Funds Rate
Debt Instrument [Line Items]
Line of credit facility, basis spread on variable rate			0.50%
Credit Facility \| Maximum \| LIBOR-based Borrowings
Debt Instrument [Line Items]
Line of credit facility, basis spread on variable rate			1.50%
Credit Facility \| Commercial And Standby Letter Of Credits
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 20,000,000
Credit Facility \| Swingline Loans
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	15,000,000
Credit Facility \| Standby Letters of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount		$ 2,900,000
Credit Facility \| Documentary Letters of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount		$ 500,000
FILO Loan
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 15,000,000
FILO Loan \| LIBOR-based Borrowings
Debt Instrument [Line Items]
Line of credit facility interest rate		5.29%
Line of credit facility, expiration date		Jun. 09, 2019
FILO Loan \| Prime-based Borrowings
Debt Instrument [Line Items]
Line of credit facility, amount outstanding		$ 15,000,000
FILO Loan \| Minimum \| Federal Funds Rate
Debt Instrument [Line Items]
Line of credit facility, basis spread on variable rate		1.75%
FILO Loan \| Minimum \| LIBOR-based Borrowings
Debt Instrument [Line Items]
Line of credit facility, basis spread on variable rate		2.75%
FILO Loan \| Maximum \| Federal Funds Rate
Debt Instrument [Line Items]
Line of credit facility, basis spread on variable rate		2.00%
FILO Loan \| Maximum \| LIBOR-based Borrowings
Debt Instrument [Line Items]
Line of credit facility, basis spread on variable rate		3.00%