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Stated Capital - Narrative (Detail)
12 Months Ended
Dec. 31, 2021
votesPerShare
Disclosure of classes of share capital [line items]  
Percentage of authorised but unissued stated capital as percentage of issued stated capital 5.00%
Number Of Votes Per Share 1
Top of range  
Disclosure of classes of share capital [line items]  
Percentage of authorised but unissued stated capital as percentage of issued stated capital 5.00%
Buy back of ordinary shares during any financial year as percentage of issued share capital 20.00%