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Exploration and Evaluation Assets - Additional Information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2021
CAD ($)
ha
Claims
Disclosure of exploration and expenditure assets [line items]  
Ownership percentage of mineral property 100.00%
Rook I Property [member]  
Disclosure of exploration and expenditure assets [line items]  
Number of mineral claims | Claims 32
Size of mineral property 35,065
Ownership percentage of mineral property 100.00%
Net smelter return royalty 2.00%
Production carried interest 10.00%
Description about net smelter return royalty The NSR may be reduced to 1% upon payment of $1 million.
Percentage decrease in return royalty 1.00%
Amount paid upon reduction of return royalty | $ $ 1
IsoEnergy Ltd. [member]  
Disclosure of exploration and expenditure assets [line items]  
Size of mineral property 32,400
Ownership percentage of mineral property 100.00%
IsoEnergy Ltd. [member] | Radio Project [member]  
Disclosure of exploration and expenditure assets [line items]  
Ownership percentage of mineral property 100.00%
Net smelter return royalty 2.00%
Description about net smelter return royalty subject to a 2% NSR and 2% gross overriding royalty
Gross overriding royalty 2.00%
IsoEnergy Ltd. [member] | Thorburn Lake Project [member]  
Disclosure of exploration and expenditure assets [line items]  
Ownership percentage of mineral property 100.00%
Net smelter return royalty 1.00%
Production carried interest 10.00%
Description about net smelter return royalty subject to a 1% NSR and a 10% carried interest which can be converted to a 1% NSR at the holder’s option upon completion of a bankable feasibility study
Reduction percentage in holders option completion 1.00%
IsoEnergy Ltd. [member] | Madison, 2Z, Carlson Creek and North Thorburn Properties [member]  
Disclosure of exploration and expenditure assets [line items]  
Ownership percentage of mineral property 100.00%
IsoEnergy Ltd. [member] | Geiger Property [member]  
Disclosure of exploration and expenditure assets [line items]  
Ownership percentage of mineral property 100.00%
IsoEnergy Ltd. [member] | Larocque East Property [member]  
Disclosure of exploration and expenditure assets [line items]  
Number of mineral claims | Claims 6
Size of mineral property 16,780
Ownership percentage of mineral property 100.00%