XML 143 R112.htm IDEA: XBRL DOCUMENT
v3.19.1

SEGMENTED INFORMATION (Details Textual) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Segmented information [Line Items] |  |
Severance and Other Termination Benefits | $ 4.1 | $ 4.2
Major Customer [Member] |  |
Segmented information [Line Items] |  |
Percentage of entity's revenue | 79.00% | 68.00%

X
- Definition The percentage of the entity's revenue. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 8 -IssueDate 2018-01-01 -Paragraph 34 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_34&doctype=Standard -URIDate 2018-03-16 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The disclosure of detailed information about reportable operating segments. + References No definition available. + Details
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Namespace Prefix: | ngd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount represents the value of severance and other termination benefits. + References No definition available. + Details
Name: | ngd_SeveranceAndOtherTerminationBenefits
Namespace Prefix: | ngd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | ifrs-full_MajorCustomersAxis=ngd_MajorCustomerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |