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(Loss)/earnings per share (Details)
£ / shares in Units, £ in Thousands, shares in Thousands
 12 Months Ended
Jun. 30, 2020
GBP (£)
£ / shares
item
shares
Jun. 30, 2019
GBP (£)
£ / shares
shares
Jun. 30, 2018
GBP (£)
£ / shares
shares
Earnings per share      
(Loss)/profit for the year | £ £ (23,233) £ 18,881 £ (37,629)
Basic (loss)/earnings per share | £ / shares £ (0.1414) £ 0.1148 £ (0.2292)
Diluted (loss)/earnings per share | £ / shares [1] £ (0.1414) £ 0.1147 £ (0.2292)
Number of categories of dilutive potential ordinary shares | item 1    
Weighted average number of ordinary shares used as the denominator in calculating basic (loss)/earnings per share 164,253 164,526 164,195
Weighted average number of ordinary shares and potential ordinary shares used as the denominator in calculating diluted (loss)/earnings per share [1] 164,253 164,666 164,195
Class A ordinary shares      
Earnings per share      
Weighted average number of ordinary shares used as the denominator in calculating basic (loss)/earnings per share 40,573 40,526 40,195
Adjustment for calculation of diluted (loss)/earnings per share assumed conversion into Class A ordinary shares [1]   140  
Class B ordinary shares      
Earnings per share      
Weighted average number of ordinary shares used as the denominator in calculating basic (loss)/earnings per share 124,000 124,000 124,000
Treasury shares      
Earnings per share      
Weighted average number of ordinary shares used as the denominator in calculating basic (loss)/earnings per share 320    
[1] For the years ended 30 June 2020 and 2018, potential ordinary shares are antidilutive, as their inclusion in the diluted loss per share calculation would reduce the loss per share, and hence have been excluded. For the year ended 30 June 2019, potential ordinary shares have been treated as dilutive, as their inclusion in the diluted earnings per share calculation decreases earnings per share.