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(Loss)/earnings per share (Details)
£ / shares in Units, £ in Thousands, shares in Thousands
 12 Months Ended
Jun. 30, 2018
GBP (£)
£ / shares
item
shares
Jun. 30, 2017
GBP (£)
£ / shares
shares
Jun. 30, 2016
GBP (£)
£ / shares
shares
(Loss)/earnings per share      
Weighted average number of ordinary shares outstanding, basic 164,195 164,025 163,890
Weighted average number of ordinary shares outstanding, diluted 164,610 164,493 164,319
(Loss)/profit attributable to owners of the parent | £ £ (37,270) £ 39,177 £ 36,371
(Loss)/profit attributable to owners of the parent | £ £ (37,270) £ 39,177 £ 36,371
Basic (loss)/earnings per share | £ / shares £ (0.2270) £ 0.2388 £ 0.2219
Diluted (loss)/earnings per share | £ / shares [1] £ (0.2270) £ 0.2382 £ 0.2213
Number of categories of dilutive potential ordinary shares | item 1    
Class A ordinary shares      
(Loss)/earnings per share      
Weighted average number of ordinary shares outstanding, basic 40,195 40,025 39,890
Adjustment for assumed conversion into Class A ordinary shares 415 468 429
Class B ordinary shares      
(Loss)/earnings per share      
Weighted average number of ordinary shares outstanding, basic 124,000 124,000 124,000
[1] For the year ended 30 June 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 years ended 30 June 2017 and 2016, potential ordinary shares have been treated as dilutive, as their inclusion in the diluted earnings per share calculation decreases earnings per share.