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Share-Based Payments - 2018 Sharesave Plan and Bonus Equity Payments (Details)
12 Months Ended
Jun. 30, 2023
2018 Sharesave Plan  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Employment requisite period 5 years
Maximum period shares may be granted after approval 10 years
Exercisable period 6 months
Other  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Vesting period 3 years
Bottom of range | 2018 Sharesave Plan  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Employee contribution period 3 years
Top of range | 2018 Sharesave Plan  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Employee contribution period 5 years