No definition available.

Name:	dnn_ExpectedTerm
Namespace Prefix:	dnn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The estimated per share fair value of warrants, on the date of issue, based on a relative fair value basis approach.

+ References

No definition available.

+ Details

Name:	dnn_FairvalueOfWarrants
Namespace Prefix:	dnn_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The exchange rate from USD to CAD.

+ References

No definition available.

+ Details

Name:	dnn_ForeignExchangeRate
Namespace Prefix:	dnn_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Exercise price per share of warrants issued.

+ References

No definition available.

+ Details

Name:	dnn_SharePurchaseWarrantsExercisePrice
Namespace Prefix:	dnn_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of share purchase warrants issued.

+ References

No definition available.

+ Details

Name:	dnn_SharePurchaseWarrantsIssued
Namespace Prefix:	dnn_
Data Type:	xbrli:sharesItemType
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_SharePurchaseWarrantsLineItems
Namespace Prefix:	dnn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2022-03-24
-Paragraph 47
-Subparagraph a
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2022-en-r&anchor=para_47_a_i&doctype=Standard
-URIDate 2022-03-24

+ Details

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

- Definition

The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]]

+ References

+ Details

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

- Definition

The percentage of an expected dividend used to calculate the fair value of share options granted.

+ References

+ Details

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

- Details

Name:	ifrs-full_ClassesOfFinancialAssetsAxis=dnn_February2021WarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialAssetsAxis=dnn_March2021WarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

SHARE PURCHASE WARRANTS - Additional information (Details)	1 Months Ended				12 Months Ended
	Mar. 31, 2021 $ / shares shares	Mar. 31, 2021 $ / shares shares	Feb. 28, 2021 $ / shares shares	Feb. 28, 2021 $ / shares shares	Dec. 31, 2022 $ / shares	Dec. 31, 2021 $ / shares
SHARE PURCHASE WARRANTS
Expected dividend yield					0.00%	0.00%
February 2021 Warrants
SHARE PURCHASE WARRANTS
Share purchase warrants issued \| shares			15,796,975	15,796,975
Exercise price of share purchase warrants				$ 2.00
Estimated fair value of warrants, per share			$ 0.2215			$ 0.4032
Foreign exchange rate			$ 0.7928		$ 0.7383	$ 0.7888
Expected volatility			67.00%	67.00%	28.00%	84.00%
Risk-free interest rate			0.22%	0.22%	4.07%	0.91%
Expected dividend yield			0.00%	0.00%	0.00%	0.00%
Expected term			24 months	24 months	1 month 17 days	1 year 1 month 17 days
March 2021 Warrants
SHARE PURCHASE WARRANTS
Share purchase warrants issued \| shares	39,215,000	39,215,000
Exercise price of share purchase warrants		$ 2.25
Estimated fair value of warrants, per share	$ 0.2482					$ 0.3563
Foreign exchange rate	$ 0.7992				$ 0.7383	$ 0.7888
Expected volatility	72.00%	72.00%			29.00%	82.00%
Risk-free interest rate	0.27%	0.27%			4.07%	0.91%
Expected dividend yield	0.00%	0.00%			0.00%	0.00%
Expected term	24 months	24 months			2 months 19 days	1 year 2 months 19 days