v3.26.1
Post employment benefits - Expected age at death of an average worker who retires currently at age 65, one who is currently aged 45 and subsequently retires at the age of 65 (Details) - yr
 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
United Kingdom | Retiring currently at age 65 | Male      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 87.2 86.7 86.8
United Kingdom | Retiring currently at age 65 | Female      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 88.6 88.3 88.4
United Kingdom | Currently aged 45, retiring at age 65 | Male      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 88.0 87.5 88.1
United Kingdom | Currently aged 45, retiring at age 65 | Female      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 90.3 90.0 90.5
Ireland | Retiring currently at age 65 | Male      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 87.4 86.9 87.2
Ireland | Retiring currently at age 65 | Female      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 89.9 89.6 89.7
Ireland | Currently aged 45, retiring at age 65 | Male      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 88.7 88.2 88.8
Ireland | Currently aged 45, retiring at age 65 | Female      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 91.3 91.0 91.4
United States | Retiring currently at age 65 | Male      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 85.9 85.8 85.7
United States | Retiring currently at age 65 | Female      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 87.5 87.5 87.4
United States | Currently aged 45, retiring at age 65 | Male      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 87.4 87.3 87.2
United States | Currently aged 45, retiring at age 65 | Female      
Disclosure of defined benefit plans [line items]      
Expected age at death of an average worker 89.0 88.9 88.9