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Investments in associates and joint ventures - Narrative (Details)
12 Months Ended
Jun. 30, 2024
Jun. 30, 2024
£ / $
Jun. 30, 2024
€ / $
Jun. 30, 2024
Jun. 30, 2023
£ / $
Jun. 30, 2023
€ / $
Jun. 30, 2022
£ / $
Jun. 30, 2022
€ / $
Disclosure of associates [line items]                
Average exchange rate (EUR per USD)   0.80 0.93   0.83 0.96 0.75 0.89
Moet Hennessy                
Disclosure of associates [line items]                
Ownership interest in associate       34.00%        
Country of incorporation France              
Average exchange rate (EUR per USD)     0.93     0.96   0.89