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Summary of significant accounting policies - Basis of preparation (Details)
12 Months Ended
Jun. 30, 2022
GBP (£)
item
Jun. 30, 2022
USD ($)
Jun. 30, 2021
GBP (£)
Jun. 30, 2021
USD ($)
COVID-19 pandemic        
Number of domestic games played instead of overseas tour | item 4      
Number of home domestic games played instead of overseas tour | item 2      
Cash resources £ 121,223,000   £ 110,658,000  
Borrowings 636,122,000   530,236,000  
Senior secured notes        
COVID-19 pandemic        
Notional amount | $   $ 425,000,000   $ 425,000,000
Borrowings 347,173,000   304,474,000  
Secured term loan facility        
COVID-19 pandemic        
Notional amount | $   $ 225,000,000   $ 225,000,000
Borrowings 183,192,000   160,575,000  
Revolving facilities        
COVID-19 pandemic        
Undrawn borrowing facilities 200,000,000   140,000,000  
Borrowings £ 100,000,000   £ 60,000,000