v3.26.1
Financial risk management and financial instruments - Derivatives Entered (Details)
$ in Thousands, € in Millions
12 Months Ended
Jun. 30, 2026
USD ($)
$ / €
R / $
MMBbls
Jun. 30, 2025
USD ($)
R / $
$ / €
$ / bbl
MMBbls
Jun. 30, 2026
EUR (€)
$ / €
R / $
MMBbls
Jun. 30, 2025
EUR (€)
R / $
$ / €
$ / bbl
MMBbls
Crude oil put options purchased        
Financial risk management and financial instruments        
Number of barrels - open positions | MMBbls   22.5   22.5
Number of barrels - settled | MMBbls 22.8 16.8 22.8 16.8
Annual average price | $ / bbl   59.8   59.8
Forward exchange contracts | US Dollar        
Financial risk management and financial instruments        
Contract/Notional amount - open positions | $ $ 693,000 $ 907,000    
Annual average price 16.71 18.51 16.71 18.51
Forward exchange contracts | Euro        
Financial risk management and financial instruments        
Contract/Notional amount - open positions | €     € 252 € 54
Annual average price | $ / € 1.17 1.11 1.17 1.11
Foreign exchange zero cost collars        
Financial risk management and financial instruments        
Contract/Notional amount - open positions | $ $ 1,128,000 $ 1,720,000    
Contract/Notional amount - settled | $ $ 1,720,000 $ 1,652,000    
Annual average floor price 16.57 17.6 16.57 17.6
Annual average cap price 19.17 21.13 19.17 21.13
Put options purchased - Rand/US$ currency        
Financial risk management and financial instruments        
Contract/Notional amount - open positions | $ $ 50,000      
Annual average price | $ / € 17.4   17.4  
Put spread options purchased - Brent crude oil        
Financial risk management and financial instruments        
Contract/Notional amount - open positions | $ $ 16,000      
Annual average floor price 59   59  
Annual average cap price 43.9   43.9  
Put with a call spread option purchased - Brent crude oil        
Financial risk management and financial instruments        
Contract/Notional amount - open positions | $ $ 5,000      
Annual average floor price 59   59  
Annual average cap price 76.86   76.86  
Annual average upper cap price 86.86   86.86  
Currency put options, oil put spread options and oil put with call spread option        
Financial risk management and financial instruments        
Premium paid | $ $ 131,900 $ 114,090