v3.26.1
Mineral Rights and Properties, Net - Summary of Mineral Rights and Properties, Net (Detail) - USD ($)
$ in Thousands
Mar. 31, 2026
Jun. 30, 2025
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
[1] Represents the carrying value of capitalized costs associated with asset retirement obligations, as discussed in Note 5-Asset Retirement Obligations.