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Shareholders' equity - Ordinary shares purchased on-market (Details) - Ordinary shares
12 Months Ended
Sep. 30, 2023
$ / shares
shares
Ordinary shares purchased and sold on market  
Number 3,400,723
Employee Share Plan (ESP)  
Ordinary shares purchased and sold on market  
Number 1,156,722
Average Price | $ / shares $ 23.79
Restricted Share Plan (RSP)  
Ordinary shares purchased and sold on market  
Number 2,061,377
Average Price | $ / shares $ 23.40
Westpac Performance Plan (WPP) | Share rights  
Ordinary shares purchased and sold on market  
Number 182,624
Average Price | $ / shares $ 22.70
Parent Entity  
Ordinary shares purchased and sold on market  
Number 3,400,723
Parent Entity | Employee Share Plan (ESP)  
Ordinary shares purchased and sold on market  
Number 1,156,722
Average Price | $ / shares $ 23.79
Parent Entity | Restricted Share Plan (RSP)  
Ordinary shares purchased and sold on market  
Number 2,061,377
Average Price | $ / shares $ 23.40
Parent Entity | Westpac Performance Plan (WPP) | Share rights  
Ordinary shares purchased and sold on market  
Number 182,624
Average Price | $ / shares $ 22.70