v3.25.2
Property, Plant and Equipment - Summary of Principal Depreciation Methods and Rates Applied to Major Asset Categories (Detail)
 12 Months Ended
Jun. 30, 2025
Buildings [member] | Straight line [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Typical depreciation methodology SL
Buildings [member] | Unit of production [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Typical depreciation methodology UoP
Depreciation rate based upon reserves
Buildings [member] | Bottom of range [member] | Straight line [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Depreciation rate 25 years
Buildings [member] | Top of range [member] | Straight line [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Depreciation rate 50 years
Plant and equipment [member] | Straight line [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Typical depreciation methodology SL
Plant and equipment [member] | Unit of production [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Typical depreciation methodology UoP
Depreciation rate based upon reserves
Plant and equipment [member] | Bottom of range [member] | Straight line [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Depreciation rate 3 years
Plant and equipment [member] | Top of range [member] | Straight line [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Depreciation rate 30 years
Mineral rights [member] | Unit of production [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Typical depreciation methodology UoP
Depreciation rate based upon reserves
Capitalised exploration, evaluation and development expenditure [member] | Unit of production [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Typical depreciation methodology UoP
Depreciation rate based upon reserves