No definition available.

Name:	dnn_BuildingAndMachinery
Namespace Prefix:	dnn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of carrying value of significant mineral property assets.

+ References

No definition available.

+ Details

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

- Definition

Represents the percentage of net smelter return royalty on the portion of the project that is not owned.

+ References

No definition available.

+ Details

Name:	dnn_NetSmelterReturnRoyaltyPercentage
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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

It represents the percentage of proportion of ownership interest of contractual arrangement.

+ References

No definition available.

+ Details

Name:	dnn_OwnershipInterestInContractualArrangements
Namespace Prefix:	dnn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of mineral property assets.

+ References

No definition available.

+ Details

Name:	dnn_PercentageOfMineralPropertyAssets
Namespace Prefix:	dnn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	dnn_PercentageofBuildingandMachinery
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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

Name:	dnn_PropertyPlantAndEquipmentsLineItems
Namespace Prefix:	dnn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

It represents the percentage of proportion of ownership interest key operations contractual arrangement.

+ References

No definition available.

+ Details

Name:	dnn_ProportionOfOwnershipInterestKeyContractualArrangements
Namespace Prefix:	dnn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The proportion of ownership interest in a joint operation attributable to the entity. [Refer: Joint operations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2022-03-24
-Paragraph 21
-Subparagraph a
-Clause iv
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2022-en-r&anchor=para_21_a_iv&doctype=Standard
-URIDate 2022-03-24

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_JointOperationsAxis=dnn_WaterburyLakeUraniumLPMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_JointOperationsAxis=dnn_MidwestJointVentureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_JointOperationsAxis=dnn_WollyJointVentureMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	ifrs-full_JointOperationsAxis=dnn_JohnstonLakeJointVentureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_JointVenturesAxis=dnn_JCUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=stpr_CA-SK
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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - CAD ($)		1 Months Ended	12 Months Ended
	Aug. 03, 2021	Nov. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
PROPERTY PLANT AND EQUIPMENT
Percentage of mineral property assets			90.50%
Net smelter return royalty			2.00%
Wheeler River Joint Venture
PROPERTY PLANT AND EQUIPMENT
Ownership Interest, in Key Contractual Arrangements			90.00%
Waterbury Lake Uranium LP
PROPERTY PLANT AND EQUIPMENT
Ownership interest, Joint Operations			67.41%	66.90%
Midwest Joint Venture
PROPERTY PLANT AND EQUIPMENT
Ownership Interest, in Key Contractual Arrangements			25.17%	25.17%
Mann Lake Joint Venture
PROPERTY PLANT AND EQUIPMENT
Ownership Interest, in Key Contractual Arrangements			30.00%	30.00%
Wolly Joint Venture
PROPERTY PLANT AND EQUIPMENT
Ownership Interest, in Key Contractual Arrangements			20.77%	21.32%
Johnston Lake Joint Venture
PROPERTY PLANT AND EQUIPMENT
Ownership interest, contractual arrangements			100.00%
McClean Lake Joint Venture
PROPERTY PLANT AND EQUIPMENT
Building and Machinery			$ 58,378,000
Percentage of building and machinery			78.20%
Ownership Interest, in Key Contractual Arrangements			22.50%	22.50%
JCU
PROPERTY PLANT AND EQUIPMENT
Ownership interest, Joint Operations		50.00%	50.00%	50.00%
JCU \| Wheeler River Joint Venture
PROPERTY PLANT AND EQUIPMENT
Ownership interest, Joint Operations	5.00%		5.00%
Saskatchewan
PROPERTY PLANT AND EQUIPMENT
Carrying value of mineral property assets			$ 163,119,000
Percentage of mineral property assets			90.50%