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Borrowings (Details)
12 Months Ended
Jun. 30, 2018
GBP (£)
Jun. 30, 2017
GBP (£)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
GBP (£)
Jun. 30, 2017
USD ($)
Jun. 30, 2017
GBP (£)
Disclosure of detailed information about borrowings            
Total borrowings       £ 495,768,000   £ 503,354,000
Non-current borrowings       486,694,000   497,630,000
Current borrowings       9,074,000   5,724,000
Minimum amount of consolidated profit or loss (EBITDA) to be maintained £ 65,000,000          
Period of time for financial maintenance covenant testing 12 months          
Senior secured notes            
Disclosure of detailed information about borrowings            
Total borrowings       318,347,000   323,113,000
Non-current borrowings       318,347,000   323,113,000
Unamortized issue costs on borrowings       3,770,000   4,112,000
Principal amount / Notional amount | $     $ 425,000,000   $ 425,000,000  
Secured term loan facility            
Disclosure of detailed information about borrowings            
Total borrowings       168,347,000   170,767,000
Non-current borrowings       168,347,000   170,767,000
Unamortized issue costs on borrowings       2,185,000   2,470,000
Principal amount / Notional amount | $     $ 225,000,000   $ 225,000,000  
Secured bank loan            
Disclosure of detailed information about borrowings            
Total borrowings       3,750,000   4,169,000
Non-current borrowings           3,750,000
Accrued interest on senior secured notes            
Disclosure of detailed information about borrowings            
Total borrowings       5,324,000   5,305,000
Undrawn committed revolving borrowing facility            
Disclosure of detailed information about borrowings            
Undrawn committed revolving borrowings facility       125,000,000    
Incremental borrowings       £ 25,000,000    
Amount drawn down from borrowing facilities £ 0 £ 0        
Fixed interest rate | Senior secured notes            
Disclosure of detailed information about borrowings            
Borrowings, interest rate     3.79% 3.79%    
Floating interest rate | Secured term loan facility            
Disclosure of detailed information about borrowings            
Borrowings, interest rate basis US dollar LIBOR          
Floating interest rate | Secured bank loan            
Disclosure of detailed information about borrowings            
Borrowings, interest rate basis LIBOR          
Adjustment to interest rate basis     1.00% 1.00%    
Floating interest rate | Undrawn committed revolving borrowing facility            
Disclosure of detailed information about borrowings            
Borrowings, interest rate basis LIBOR or EURIBOR          
Minimum | Senior secured notes            
Disclosure of detailed information about borrowings            
Percentage aggregate principal amount debt redemption 5.00%          
Minimum | Floating interest rate | Secured term loan facility            
Disclosure of detailed information about borrowings            
Adjustment to interest rate basis     1.25% 1.25%    
Minimum | Floating interest rate | Undrawn committed revolving borrowing facility            
Disclosure of detailed information about borrowings            
Adjustment to interest rate basis     1.25% 1.25%    
Maximum | Senior secured notes            
Disclosure of detailed information about borrowings            
Percentage aggregate principal amount debt redemption 100.00%          
Maximum | Floating interest rate | Secured term loan facility            
Disclosure of detailed information about borrowings            
Adjustment to interest rate basis     1.75% 1.75%    
Maximum | Floating interest rate | Undrawn committed revolving borrowing facility            
Disclosure of detailed information about borrowings            
Adjustment to interest rate basis     1.75% 1.75%    
Not later than one month | Secured bank loan            
Disclosure of detailed information about borrowings            
Total borrowings       £ 106,000    
Not later than thirteen months | Secured bank loan            
Disclosure of detailed information about borrowings            
Total borrowings           525,000
Maturity date 9 July 2018 | Secured bank loan            
Disclosure of detailed information about borrowings            
Total borrowings       £ 3,644,000   £ 3,644,000