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Borrowings (Details)
12 Months Ended
Jun. 30, 2020
GBP (£)
Jun. 30, 2020
USD ($)
Jun. 30, 2020
GBP (£)
Jun. 30, 2019
USD ($)
Jun. 30, 2019
GBP (£)
Disclosure of detailed information about borrowings          
Total borrowings     £ 525,615,000   £ 511,232,000
Non-current borrowings     520,010,000   505,779,000
Current borrowings     5,605,000   5,453,000
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     340,417,000   330,757,000
Non-current borrowings     340,417,000   330,757,000
Unamortized issue costs on borrowings     3,044,000   3,414,000
Principal amount / Notional amount | $   $ 425,000,000   $ 425,000,000  
Secured term loan facility          
Disclosure of detailed information about borrowings          
Total borrowings     179,593,000   175,022,000
Non-current borrowings     179,593,000   175,022,000
Unamortized issue costs on borrowings     2,241,000   1,894,000
Principal amount / Notional amount | $   $ 225,000,000   $ 225,000,000  
Accrued interest on senior secured notes          
Disclosure of detailed information about borrowings          
Total borrowings     5,605,000   £ 5,453,000
Undrawn committed revolving facility          
Disclosure of detailed information about borrowings          
Undrawn committed revolving borrowings facility     £ 150,000,000    
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 | Undrawn committed revolving facility          
Disclosure of detailed information about borrowings          
Borrowings, interest rate basis LIBOR or EURIBOR        
Minimum | Senior secured notes          
Disclosure of detailed information about borrowings          
Debt redemption, percentage of aggregate principal amount 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 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          
Debt redemption, percentage of aggregate principal amount 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 facility          
Disclosure of detailed information about borrowings          
Adjustment to interest rate basis   1.75% 1.75%