Face (par) amount of debt instrument at time of issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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

- 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

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

+ Details

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

- Definition

Amount of the required periodic payments applied to principal.

+ References

+ Details

Name:	us-gaap_DebtInstrumentPeriodicPaymentPrincipal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

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

+ References

+ Details

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

- 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

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

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Data Type:	na
Balance Type:
Period Type:

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- Details

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Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=dlth_DebtRefinancedMember
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Debt and Line of Credit (Narrative) (Details) - USD ($)		9 Months Ended
Debt and Line of Credit (Narrative) (Details) - USD ($)	Jul. 20, 2017	Oct. 29, 2017	Nov. 01, 2017	Oct. 07, 2016
Amended And Restated [Member]
Debt Instrument [Line Items]
Debt instrument, effective rate		2.50%
Line of credit maturity date		Jul. 31, 2019
Amended And Restated [Member] \| September 29, 2017 through July 31, 2019 [Member]
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity				$ 60,000,000
Amended And Restated [Member] \| November 1, 2017 through December 31, 2017 [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity			$ 80,000,000
Amended And Restated [Member] \| January 1, 2018 through July 31, 2019 [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity			$ 60,000,000
SRV [Member] \| SRV Mortgage Term A Note [Member]
Debt Instrument [Line Items]
Debt, original balance		$ 800,000
Debt instrument, maturity date		Sep. 30, 2017
Required monthly principal payments		$ 3,300
Debt instrument stated percentage interest rate		3.10%
SRV [Member] \| SRV Mortgage Term A Note [Member] \| Debt Refinanced [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Sep. 30, 2022
Required monthly principal payments	$ 3,300
Debt instrument stated percentage interest rate	3.69%
SRV [Member] \| SRV Mortgage Term B Note [Member]
Debt Instrument [Line Items]
Debt, original balance	$ 800,000
Debt instrument, maturity date	Sep. 30, 2022
Required monthly principal payments	$ 3,300
Debt instrument stated percentage interest rate	3.69%