Name:	ddl_ModificationOfPreferredSharesPercentageImmediatelyAfterChangeInTermsComparedToTheFairValueOfThePreferredSharesImmediatelyBeforeTheAmendmentAtEachModificationDate
Namespace Prefix:	ddl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Percentage of annual compound interest from the actual payment date of original issue price used to determine the redemption price of preferred share.

No definition available.

Name:	ddl_PercentageOfAnnualCompoundInterestFromTheActualPaymentDateOfOriginalIssuePriceUsedToDetermineTheRedemptionPriceOfPreferredShare
Namespace Prefix:	ddl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Percentage of annual simple interest from the actual payment date of original issue price used to determine the redemption price of preferred share.

No definition available.

Name:	ddl_PercentageOfAnnualSimpleInterestFromTheActualPaymentDateOfOriginalIssuePriceUsedToDetermineTheRedemptionPriceOfPreferredShare
Namespace Prefix:	ddl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Preferred shares liquidation preference percentage of annual compound interest from the actual payment date of its purchase price.

No definition available.

Name:	ddl_PreferredStockLiquidationPreferencePercentageOfAnnualCompoundInterestFromTheActualPaymentDateOfItsPurchasePrice
Namespace Prefix:	ddl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Preferred shares liquidation preference percentage of original issue price.

No definition available.

Name:	ddl_PreferredStockLiquidationPreferencePercentageOfOriginalIssuePrice
Namespace Prefix:	ddl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Preferred stock liquidation preference percentage of original price as adjusted for share subdivision on each preferred share.

No definition available.

Name:	ddl_PreferredStockLiquidationPreferencePercentageOfOriginalPriceAsAdjustedForShareSubdivisionOnEachPreferredShare
Namespace Prefix:	ddl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Temporary equity, shares issued price per share.

No definition available.

Name:	ddl_TemporaryEquitySharesIssuedPricePricePerShare
Namespace Prefix:	ddl_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

Temporary equity stock issued during period shares new issues.

No definition available.

Name:	ddl_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues
Namespace Prefix:	ddl_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Threshold percentage of change in fair value used to determine the applicability of accounting.

No definition available.

Name:	ddl_ThresholdPercentageOfChangeInFairValueUsedToDetermineTheApplicabilityOfAccounting
Namespace Prefix:	ddl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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(29))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_CommonStockSharesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4332-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4313-108586

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586

Name:	us-gaap_ConversionOfStockSharesIssued1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

Name:	us-gaap_DebtConversionConvertedInstrumentSharesIssued1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817

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

The cash outflow for cost incurred directly with the issuance of an equity security.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585

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

The cash inflow from issuance of callable preferred stock which is identified as being convertible to another type of financial security at the option of the issuer or the holder.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585

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

Number of shares issued under share-based payment arrangement.

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

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

Amount of decrease to net income for accretion of temporary equity to its redemption value to derive net income apportioned to common stockholders.

No definition available.

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

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.

No definition available.

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

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

Name:	ddl_ApplicabilityOfTypeOfAccountingAxis=ddl_ExceedingTenPercentResultToExtinguishmentAccountingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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

Name:	ddl_ApplicabilityOfTypeOfAccountingAxis=ddl_NotExceedingTenPercentResultToModificationAccountingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementClassOfStockAxis=ddl_SeriesAngelRedeemableConvertiblePreferredSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementClassOfStockAxis=ddl_SeriesPreARedeemableConvertiblePreferredSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementClassOfStockAxis=ddl_SeriesARedeemableConvertiblePreferredSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementClassOfStockAxis=ddl_SeriesAPlusRedeemableConvertiblePreferredSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementClassOfStockAxis=ddl_SeriesBRedeemableConvertiblePreferredSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementClassOfStockAxis=ddl_SeriesBTwoRedeemableConvertiblePreferredSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementClassOfStockAxis=ddl_SeriesBThreeRedeemableConvertiblePreferredSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementClassOfStockAxis=ddl_SeriesBFourRedeemableConvertiblePreferredSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_ClassOfWarrantOrRightAxis=ddl_SeriesB4WarrantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=ddl_EatTogetherHoldingLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementClassOfStockAxis=ddl_SeriesBFourOneRedeemableConvertiblePreferredSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=ddl_FounderMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementEquityComponentsAxis=ddl_EatTogetherWarrantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementClassOfStockAxis=ddl_SeriesCOneRedeemableConvertiblePreferredSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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

Name:	us-gaap_StatementClassOfStockAxis=ddl_SeriesAngelPlusRedeemableConvertiblePreferredSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementClassOfStockAxis=ddl_SeriesAngelPreferredShareAndSeriesAngelPlusPreferredShareMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementClassOfStockAxis=ddl_SeriesAngelPlusPreferredSharesAndSeriesAngelPreferredSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementClassOfStockAxis=ddl_SeriesDRedeemableConvertiblePreferredSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementClassOfStockAxis=ddl_SeriesDPlusRedeemableConvertiblePreferredSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: