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Employee Benefits - Summary of Number of Awards and Movements for all Share Plans (Parenthetical) (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
WEP [member] |  |
Disclosure of number and weighted average exercise prices of other equity instruments [line items] |  |
Share price on grant date | $ 16.3 | $ 15.17
Restricted Shares [member] |  |
Disclosure of number and weighted average exercise prices of other equity instruments [line items] |  |
Share price on grant date |  | 20.18
Restricted Shares [member] | Bottom of range [member] |  |
Disclosure of number and weighted average exercise prices of other equity instruments [line items] |  |
Share price on grant date | 19.2 |
Restricted Shares [member] | Top of range [member] |  |
Disclosure of number and weighted average exercise prices of other equity instruments [line items] |  |
Share price on grant date | 19.27 |
Performance Rights [member] | Bottom of range [member] |  |
Disclosure of number and weighted average exercise prices of other equity instruments [line items] |  |
Share price on grant date | 13.08 | 11.66
Performance Rights [member] | Top of range [member] |  |
Disclosure of number and weighted average exercise prices of other equity instruments [line items] |  |
Share price on grant date | 13.71 | 14.44
SWEP [member] |  |
Disclosure of number and weighted average exercise prices of other equity instruments [line items] |  |
Share price on grant date | $ 19.74 | $ 0

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