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Financial Risk Management - Additional Information (Detail) t in Thousands, $ in Millions | 12 Months Ended |
--- | --- | ---
Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) t | Jun. 30, 2024 EUR (€) t | Jun. 30, 2024 GBP (£) t | Jun. 30, 2024 CAD ($) t | Jun. 30, 2024 AUD ($) t | Jun. 30, 2024 USD ($) t | Jun. 30, 2024 CLP ($) t
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Borrowings |  | $ 19,326 |  |  |  |  | $ 17,602 |
Transfer between fair value hierarchy categories | $ 0 |  |  |  |  |  |  |
Percentage of borrowings exposed to floating interest rate | 97.00% | 98.00% |  |  |  |  |  |
Weighted average interest rate payable | USD SOFR +1.40 per cent | USD SOFR +1.54 per cent |  |  |  |  |  |
Debt instrument variable interest rate spread |  | 1.54% | 1.40% | 1.40% | 1.40% | 1.40% | 1.40% | 1.40%
Interest rate risk [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Reasonable possible change in risk, percentage |  |  | 1.00% | 1.00% | 1.00% | 1.00% | 1.00% | 1.00%
Effect on equity and profit after taxation, due to reasonable possible change in risk |  | $ 58 |  |  |  |  | $ 47 |
Currency risk [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Reasonable possible change in risk, amount |  |  | € 0.01 | £ 0.01 | $ 0.01 | $ 0.01 |  | $ 10
Effect on equity and profit after taxation, due to reasonable possible change in risk |  | 15 |  |  |  |  | $ 17 |
Commodity price risk [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Reasonable possible change in risk, percentage |  |  | 10.00% | 10.00% | 10.00% | 10.00% | 10.00% | 10.00%
Commodity price risk [member] | Forward commodity and other derivative contracts [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Net fair value of financial assets and (liabilities) |  | $ 20 |  |  |  |  | $ 42 |
Commodity price risk [member] | Provisionally priced contract [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Reasonable possible change in risk, percentage |  |  | 10.00% | 10.00% | 10.00% | 10.00% | 10.00% | 10.00%
Tonnes of copper exposure | t |  | 314 | 428 | 428 | 428 | 428 | 428 | 428
Effect on equity and profit after taxation, due to reasonable possible change in risk |  | $ 184 |  |  |  |  | $ 299 |
Fixed interest rate not swapped to floating rate [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Borrowings |  | 534 |  |  |  |  | 532 |
Fixed interest rate not swapped to floating rate [member] | At fair value [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Borrowings |  | $ 538 |  |  |  |  | $ 538 |

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