Mineral Rights and Properties, Net - Summary of Mineral Rights and Properties, Net (Detail) - USD ($) $ in Thousands |
Mar. 31, 2026 |
Jun. 30, 2025 |
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|---|---|---|---|---|
| Mineral Properties Net [Line Items] | ||||
| Mineral rights and properties, net | $ 7,633 | $ 7,735 | ||
| Mineral properties [Member] | ||||
| Mineral Properties Net [Line Items] | ||||
| Mineral rights and properties, net | 6,733 | 6,733 | ||
| Hydrology Wells [Member] | ||||
| Mineral Properties Net [Line Items] | ||||
| Mineral rights and properties, net | 547 | 547 | ||
| Asset Retirement Cost [Member] | ||||
| Mineral Properties Net [Line Items] | ||||
| Mineral rights and properties, net | [1] | $ 353 | $ 455 | |
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