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Investment in Ambler Metals LLC - Narrative (Details) | 10 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Nov. 30, 2020 USD ($) | Nov. 30, 2021 USD ($) Owner | Nov. 30, 2020 USD ($) | Nov. 30, 2019 USD ($) | Feb. 11, 2020 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Comprehensive loss |  | $ (21,660,000) | $ 161,767,000 | $ (27,905,000) |
Number of board members | Owner |  | 2 |  |  |
Service agreement |  |  |  |  |
Related party transactions - services agreement income |  |  |  |  |
Amount charged for expenses |  | $ 22,000 | 900,000 |  |
Ambler Metals |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Percentage of ownership |  | 50.00% |  |  | 50.00%
Comprehensive loss | $ (5,700,000) | $ (26,200,000) |  |  |
Number of board members | Owner |  | 4 |  |  |
Maximum exposure to loss |  | $ 160,100,000 |  |  |
Fair value ascribed to Ambler Metals LLC interest |  |  |  |  | $ 176,000,000
Related party transactions - services agreement income |  |  |  |  |
Amount charged for expenses |  | $ 4,000 | $ 2,800,000 |  |
South32 | Ambler Metals |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Percentage of ownership |  |  |  |  | 50.00%
Upper Kobuk Mineral Projects | South32 | Ambler Metals |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Joint venture, contributed amount |  |  |  |  | $ 145,000,000

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