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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

Name:	dtea_NumberOfOtherEquityInstrumentsOutstandingInShareBasedPaymentArrangementRollForward
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The weighted average exercise price of other equity instruments (ie other than share options) exercised or vested and withheld for tax in a share-based payment arrangement.

No definition available.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

Name:	dtea_WeightedAverageExercisePriceOfOtherEquityInstrumentsOutstandingInShareBasedPaymentArrangementRollForward
Namespace Prefix:	dtea_
Data Type:	xbrli:stringItemType
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The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2017-01-01
-Paragraph 47
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_b&doctype=Standard
-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 2
-IssueDate 2017-01-01
-Paragraph 45
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45&doctype=Standard
-URIDate 2017-03-09

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Data Type:	xbrli:decimalItemType
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Period Type:	duration

The number of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 2
-IssueDate 2017-01-01
-Paragraph 45
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45&doctype=Standard
-URIDate 2017-03-09

Name:	ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement
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Data Type:	xbrli:decimalItemType
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The number of other equity instruments (ie other than share options) forfeited in a share-based payment arrangement.

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
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Period Type:	duration

The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement.

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
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The weighted average exercise price of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement. [Refer: Weighted average [member]]

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The weighted average exercise price of other equity instruments (ie other than share options) forfeited in a share-based payment arrangement. [Refer: Weighted average [member]]

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Data Type:	xbrli:monetaryItemType
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The weighted average exercise price of other equity instruments (ie other than share options) granted in a share-based payment arrangement. [Refer: Weighted average [member]]

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
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The weighted average exercise price of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement. [Refer: Weighted average [member]]