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Share capital (Details)
£ in Thousands
 12 Months Ended
Jun. 30, 2018
GBP (£)
Vote
item
shares
Jun. 30, 2017
GBP (£)
shares
Jun. 30, 2018
$ / shares
shares
Ordinary shares      
Balance at the beginning | £ £ 53    
Issue of equity | £   £ 1  
Balance at the end | £ £ 53 £ 53  
Number of class of ordinary shares | item 2    
Number of class A shares to which one B share is convertible | shares 1    
Proportion of votes required for special resolutions 66.67%    
Ordinary shares      
Number of shares      
Balance at the beginning (in shares) | shares 164,195,000 164,025,000  
Employee share-based compensation awards - issue of shares (in shares) | shares 331,000 170,000  
Balance at the end (in shares) | shares 164,526,000 164,195,000  
Ordinary shares      
Balance at the beginning | £ £ 53 £ 52  
Issue of equity | £   1  
Balance at the end | £ £ 53 £ 53  
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 | shares     40,526,390
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 | shares     124,000,000