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Exploration and Evaluation Assets - Summary of Capitalized Costs on Projects (Detail) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Disclosure of exploration and expenditure assets [line items] |  |
Exploration and evaluation assets, beginning balance | $ 405,248 |
Exploration and evaluation assets, ending balance | 451,356 | $ 405,248
Acquisition cost [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Exploration and evaluation assets, beginning balance | 28,321 | 28,353
Additions | 5 | 10
Disposals due to deconsolidation of IsoEnergy | (26,632) |
Dispositions |  | (42)
Exploration and evaluation assets, ending balance | 1,694 | 28,321
Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Exploration and evaluation assets, beginning balance | 376,927 | 298,190
Expense arising from exploration for and evaluation of mineral resources | 128,329 | 78,737
Disposals due to deconsolidation of IsoEnergy | (55,594) |
Exploration and evaluation assets, ending balance | 449,662 | 376,927
Rook 1 Property [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Exploration and evaluation assets, beginning balance | 329,247 |
Exploration and evaluation assets, ending balance | 428,633 | 329,247
Rook 1 Property [member] | Acquisition cost [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Exploration and evaluation assets, beginning balance | 235 | 235
Additions | 0 | 0
Disposals due to deconsolidation of IsoEnergy | 0 |
Dispositions |  | 0
Exploration and evaluation assets, ending balance | 235 | 235
Rook 1 Property [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Exploration and evaluation assets, beginning balance | 329,012 | 260,941
Expense arising from exploration for and evaluation of mineral resources | 105,612 | 68,071
Disposals due to deconsolidation of IsoEnergy | (6,226) |
Exploration and evaluation assets, ending balance | 428,398 | 329,012
Other Athabasca Basin Properties [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Exploration and evaluation assets, beginning balance | 11,061 |
Exploration and evaluation assets, ending balance | 22,723 | 11,061
Other Athabasca Basin Properties [member] | Acquisition cost [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Exploration and evaluation assets, beginning balance | 1,458 | 1,458
Additions | 1 | 0
Disposals due to deconsolidation of IsoEnergy | 0 |
Dispositions |  | 0
Exploration and evaluation assets, ending balance | 1,459 | 1,458
Other Athabasca Basin Properties [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Exploration and evaluation assets, beginning balance | 9,603 | 9,180
Expense arising from exploration for and evaluation of mineral resources | 11,661 | 423
Disposals due to deconsolidation of IsoEnergy | 0 |
Exploration and evaluation assets, ending balance | 21,264 | 9,603
General exploration and drilling [Member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 19,576 | 13,318
General exploration and drilling [Member] | Rook 1 Property [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 6,488 | 7,705
General exploration and drilling [Member] | Other Athabasca Basin Properties [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 7,574 | 0
Environmental, permitting, and engagement [Member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 17,583 | 12,005
Environmental, permitting, and engagement [Member] | Rook 1 Property [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 17,583 | 12,005
Environmental, permitting, and engagement [Member] | Other Athabasca Basin Properties [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 0 | 0
Technical, engineering and design [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 59,917 | 32,703
Technical, engineering and design [member] | Rook 1 Property [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 59,863 | 32,703
Technical, engineering and design [member] | Other Athabasca Basin Properties [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 0 | 0
Geochemistry and assays [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 143 | 190
Geochemistry and assays [member] | Rook 1 Property [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 0 | 0
Geochemistry and assays [member] | Other Athabasca Basin Properties [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 0 | 0
Geological and Geophysical [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 6,033 | 3,957
Geological and Geophysical [member] | Rook 1 Property [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 323 | 1,941
Geological and Geophysical [member] | Other Athabasca Basin Properties [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 2,978 | 423
Labour and Wages [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 16,953 | 9,655
Labour and Wages [member] | Rook 1 Property [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 14,796 | 8,818
Labour and Wages [member] | Other Athabasca Basin Properties [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 1,109 | 0
Share-based Payments [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 6,867 | 6,364
Share-based Payments [member] | Rook 1 Property [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 5,605 | 4,532
Share-based Payments [member] | Other Athabasca Basin Properties [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 0 | 0
Travel [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 1,257 | 545
Travel [member] | Rook 1 Property [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 954 | 367
Travel [member] | Other Athabasca Basin Properties [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 0 | 0
IsoEnergy Ltd. [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Exploration and evaluation assets, beginning balance | 64,940 |
Exploration and evaluation assets, ending balance | 0 | 64,940
IsoEnergy Ltd. [member] | Acquisition cost [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Exploration and evaluation assets, beginning balance | 26,628 | 26,660
Additions | 4 | 10
Disposals due to deconsolidation of IsoEnergy | (26,632) |
Dispositions |  | (42)
Exploration and evaluation assets, ending balance | 0 | 26,628
IsoEnergy Ltd. [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Exploration and evaluation assets, beginning balance | 38,312 | 28,069
Expense arising from exploration for and evaluation of mineral resources | 11,056 | 10,243
Disposals due to deconsolidation of IsoEnergy | (49,368) |
Exploration and evaluation assets, ending balance | 0 | 38,312
IsoEnergy Ltd. [member] | General exploration and drilling [Member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 5,514 | 5,613
IsoEnergy Ltd. [member] | Environmental, permitting, and engagement [Member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 0 | 0
IsoEnergy Ltd. [member] | Technical, engineering and design [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 54 | 0
IsoEnergy Ltd. [member] | Geochemistry and assays [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 143 | 190
IsoEnergy Ltd. [member] | Geological and Geophysical [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 2,732 | 1,593
IsoEnergy Ltd. [member] | Labour and Wages [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 1,048 | 837
IsoEnergy Ltd. [member] | Share-based Payments [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | 1,262 | 1,832
IsoEnergy Ltd. [member] | Travel [member] | Deferred Exploration Costs [member] |  |
Disclosure of exploration and expenditure assets [line items] |  |
Expense arising from exploration for and evaluation of mineral resources | $ 303 | $ 178

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