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Financial Risk Management - Additional Information (Detail) t in Thousands, $ in Millions | 12 Months Ended |
--- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) t | Jun. 30, 2019 USD ($) | Jun. 30, 2021 AUD ($) t | Jun. 30, 2021 GBP (£) t | Jun. 30, 2021 EUR (€) t | Jun. 30, 2021 USD ($) t | Jun. 30, 2021 CLP ($) t
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Borrowings |  | $ 23,605 |  |  |  |  | $ 17,087 |
Transfer between fair value hierarchy categories | $ 0 |  |  |  |  |  |  |
Percentage of borrowings exposed to floating interest rate | 82.00% | 87.00% |  |  |  |  |  |
Weighted average interest rate payable | USD LIBOR + 2.18 per cent | USD LIBOR + 2.95 per cent |  |  |  |  |  |
Debt instrument variable interest rate spread |  | 2.95% |  | 2.18% | 2.18% | 2.18% | 2.18% | 2.18%
Fair value change on derivatives | $ 145 | $ 422 | $ 8 |  |  |  |  |
Loans received from bank |  |  |  |  |  |  | $ 2,300 |
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 |  | $ 47 |  |  |  |  | $ 7 |
Notional value |  |  |  |  |  |  | 16,810 |
Currency risk [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Reasonable possible change in risk, amount |  |  |  | $ 0.01 | £ 0.01 | € 0.01 |  | $ 10
Effect on equity and profit after taxation, due to reasonable possible change in risk |  | $ 12 |  |  |  |  | $ 21 |
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%
Effect on equity and profit after taxation, due to reasonable possible change in risk |  | $ 8 |  |  |  |  | $ 26 |
Commodity price risk [member] | Forward commodity and other derivative contracts [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Net asset fair value |  | 159 |  |  |  |  | 138 |
Commodity price risk [member] | Significant financial instruments [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Net asset fair value |  | 180 |  |  |  |  | $ 121 |
Fair value change on derivatives | $ 59 | $ 22 |  |  |  |  |  |
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 |  | 301 |  | 254 | 254 | 254 | 254 | 254
Effect on equity and profit after taxation, due to reasonable possible change in risk |  | $ 134 |  |  |  |  | $ 166 |
Fixed interest rate not swapped to floating rate [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Borrowings |  | 3,019 |  |  |  |  | 3,018 |
Fixed interest rate not swapped to floating rate [member] | At fair value [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |
Borrowings |  | $ 4,114 |  |  |  |  | $ 4,052 |

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