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Share capital (Details)
 12 Months Ended
Jun. 30, 2020
GBP (£)
Vote
item
shares
Jun. 30, 2019
GBP (£)
shares
Jun. 30, 2020
$ / shares
shares
Ordinary shares      
Balance at the beginning | £ £ 53,000    
Balance at the end | £ £ 53,000 £ 53,000  
Number of class of ordinary shares | item 2    
Number of class A shares to which one B share is convertible 1    
Proportion of votes required for special resolutions 66.67%    
Acquisition of treasury shares | £ £ 21,305,000    
Ordinary shares      
Number of shares      
Balance at the beginning (in shares) 164,571,000 164,526,000  
Employee share-based compensation awards - issue of shares (in shares) 51,000 45,000  
Balance at the end (in shares) 164,622,000 164,571,000  
Ordinary shares      
Balance at the beginning | £ £ 53,000 £ 53,000  
Balance at the end | £ £ 53,000 £ 53,000  
Class A ordinary shares      
Ordinary shares      
Par value per ordinary share (in dollars per share) | $ / shares     $ 0.0005
Number of voting right per share | Vote 1    
Number of shares issued   40,570,967 40,622,089
Acquisition of treasury shares 1,682,896    
Acquisition of treasury shares | £ £ 21,305,000    
Class B ordinary shares      
Ordinary shares      
Par value per ordinary share (in dollars per share) | $ / shares     $ 0.0005
Number of voting right per share | Vote 10    
Percentage of ordinary shares outstanding below which Class B shares will convert to Class A 10.00%    
Percentage of voting power of shareholders 67.00%    
Number of shares issued   124,000,000 124,000,000