Name:	dla_LineOfCreditFacilityIncludingAdditionalBorrowingCapacityMaximum
Namespace Prefix:	dla_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents line of credit maximum capacity for capital lease.

No definition available.

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Namespace Prefix:	dla_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents retained earnings amount available for dividends and stock repurchases.

No definition available.

Name:	dla_RetainedEarningsAmountAvailableForDividendsAndStockRepurchases
Namespace Prefix:	dla_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

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

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

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

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

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

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.

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Period Type:	instant

The effective interest rate during the reporting period.

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

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.

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Namespace Prefix:	us-gaap_
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Period Type:	instant

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

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

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Name:	us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix:	us-gaap_
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Namespace Prefix:
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Name:	us-gaap_LongtermDebtTypeAxis=dla_TermLoanEstablishedDecember2020Member
Namespace Prefix:
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Name:	us-gaap_LineOfCreditFacilityAxis=dla_BancoFicohsaMember
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Namespace Prefix:
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Name:	us-gaap_DebtInstrumentAxis=dla_AmendedCreditAgreementMember
Namespace Prefix:
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