v3.26.3
Impairment of Non-Financial Assets, Impairment of Non-Current Assets (Excluding Goodwill) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
Aug. 27, 2021
Impairment reversal of non-current assets (excluding goodwill) [Abstract]        
Impairment/(reversal of impairment) of non-financial assets [1],[2] $ (156,013) $ 175,612 [3] $ 11,189 [3]  
Discount rate 10.00% 10.00%    
Property, plant and equipment [member]        
Impairment reversal of non-current assets (excluding goodwill) [Abstract]        
Impairment/(reversal of impairment) of non-financial assets $ (98,665) $ 106,681 0  
Mining property [member]        
Impairment reversal of non-current assets (excluding goodwill) [Abstract]        
Impairment/(reversal of impairment) of non-financial assets (36,885) 43,895 0  
Land and buildings [member]        
Impairment reversal of non-current assets (excluding goodwill) [Abstract]        
Impairment/(reversal of impairment) of non-financial assets (16,842) 16,367 0  
Capital Works in Progress [Member]        
Impairment reversal of non-current assets (excluding goodwill) [Abstract]        
Impairment/(reversal of impairment) of non-financial assets (3,621) 8,669 3,272  
North American Lithium Inc. [Member]        
Impairment reversal of non-current assets (excluding goodwill) [Abstract]        
Percentage of issued capital acquired       100.00%
Impairment/(reversal of impairment) of non-financial assets (156,000) 175,600 $ 0  
Recoverable amount $ 586,800 $ 101,400    
Discount rate 10.00%      
North American Lithium Inc. [Member] | Property, plant and equipment [member]        
Impairment reversal of non-current assets (excluding goodwill) [Abstract]        
Impairment/(reversal of impairment) of non-financial assets $ (98,700)      
North American Lithium Inc. [Member] | Mining property [member]        
Impairment reversal of non-current assets (excluding goodwill) [Abstract]        
Impairment/(reversal of impairment) of non-financial assets (36,900)      
North American Lithium Inc. [Member] | Land and buildings [member]        
Impairment reversal of non-current assets (excluding goodwill) [Abstract]        
Impairment/(reversal of impairment) of non-financial assets (16,800)      
North American Lithium Inc. [Member] | Capital Works in Progress [Member]        
Impairment reversal of non-current assets (excluding goodwill) [Abstract]        
Impairment/(reversal of impairment) of non-financial assets $ (3,600)      
[1] The impairment reversal of $156.0 million for the year ended 30 June 2026 relates to North American Lithium and includes an allocation of $0.4 million to right-of-use assets.
[2] Adjustment to profit/(loss) which is reported as part of ‘North American Lithium’ (2026: profit of $156.0 million; 2025: $175.6 million; 2024: $3.8 million), ‘All other operations’ (2026 and 2025: Nil; 2024: $4.1 million) and ‘Group / unallocated items and eliminations’ (2026 and 2025: Nil; 2024: $3.3 million). Refer to Note 14 for further details.
[3] Refer to Note 2 (a) for details on translation of prior period comparatives to United States dollars to conform with changes in presentation currency.