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Derivative instruments - Narrative (Details) gallon in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 USD ($) | Jun. 30, 2023 gallon | Mar. 31, 2023 gallon
Disclosure of derivative instruments [Line Items] |  |  |
Considerations to minimum cash guarantee, period | 4 years |  |
Foreign exchange forward contracts |  |  |
Disclosure of derivative instruments [Line Items] |  |  |
Amount hedged per month | $ 40.0 |  |
Fair value of hedged instrument | 0.4 |  |
Diesel Fuel Hedge Swap Contracts |  |  |
Disclosure of derivative instruments [Line Items] |  |  |
Fair value of hedged instrument | $ 0.3 |  |
Diesel Fuel Hedge Swap Contracts | Announcing Hedging Activity | Forecast |  |  |
Disclosure of derivative instruments [Line Items] |  |  |
Number of gallons hedged per month | gallon |  | 0.2 | 0.7

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- Definition The amount of a hedging instrument, recognised as an asset. [Refer: Hedging instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 24A -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_24A_a&doctype=Standard -URIDate 2022-03-24 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount hedged per month by the derivative instrument. + References No definition available. + Details
Name: | ngd_AmountHedgedPerMonth
Namespace Prefix: | ngd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount Of Gallons Hedged Per Month + References No definition available. + Details
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Namespace Prefix: | ngd_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Disclosure of derivative instruments. + References No definition available. + Details
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Namespace Prefix: | ngd_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Non-Current Derivative Financial Assets, Considerations To Minimum Cash Guarantee, Period + References No definition available. + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |