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(Loss)/earnings per share (Details)
£ / shares in Units, £ in Thousands, shares in Thousands
 12 Months Ended
Jun. 30, 2021
GBP (£)
£ / shares
item
shares
Jun. 30, 2020
GBP (£)
£ / shares
shares
Jun. 30, 2019
GBP (£)
£ / shares
shares
(Loss)/earnings per share      
(Loss)/profit for the year | £ £ (92,216) £ (23,233) £ 18,881
Basic (loss)/earnings per share | £ / shares £ (0.5660) £ (0.1414) £ 0.1148
Diluted (loss)/earnings per share | £ / shares [1] £ (0.5660) £ (0.1414) £ 0.1147
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 162,939 164,253 164,526
Weighted average number of ordinary shares and potential ordinary shares used as the denominator in calculating diluted (loss)/earnings per share 162,939 164,253 164,666
Class A ordinary shares      
(Loss)/earnings per share      
Weighted average number of ordinary shares used as the denominator in calculating basic (loss)/earnings per share 41,939 40,573 40,526
Adjustment for calculation of diluted (loss)/earnings per share assumed conversion into Class A ordinary shares     140
Class B ordinary shares      
(Loss)/earnings per share      
Weighted average number of ordinary shares used as the denominator in calculating basic (loss)/earnings per share 122,683 124,000 124,000
Treasury shares      
(Loss)/earnings per share      
Weighted average number of ordinary shares used as the denominator in calculating basic (loss)/earnings per share 1,683 320  
[1] For the years ended 30 June 2021 and 2020, potential ordinary shares are anti-dilutive, 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.