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Borrowings (Details)
12 Months Ended 18 Months Ended
Jun. 30, 2021
GBP (£)
Sep. 30, 2022
GBP (£)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
GBP (£)
Jun. 30, 2020
USD ($)
Disclosure of detailed information about borrowings          
Total borrowings £ 530,236,000     £ 525,615,000  
Non-current borrowings 465,049,000     520,010,000  
Current borrowings 65,187,000     5,605,000  
Minimum amount of consolidated profit or loss (EBITDA) to be maintained £ 65,000,000        
Reduced minimum amount of consolidated profit or loss (EBITDA) to be maintained   £ 25,000,000      
Period of time for financial maintenance covenant testing 12 months        
Senior secured notes          
Disclosure of detailed information about borrowings          
Total borrowings £ 304,474,000     340,417,000  
Non-current borrowings 304,474,000     340,417,000  
Unamortized issue costs on borrowings 3,050,000     3,044,000  
Principal amount / Notional amount | $     $ 425,000,000   $ 425,000,000
Secured term loan facility          
Disclosure of detailed information about borrowings          
Total borrowings 160,575,000     179,593,000  
Non-current borrowings 160,575,000     179,593,000  
Unamortized issue costs on borrowings 2,233,000     2,241,000  
Principal amount / Notional amount | $     $ 225,000,000   $ 225,000,000
Revolving facilities          
Disclosure of detailed information about borrowings          
Total borrowings 60,000,000     0  
Undrawn borrowing facilities 140,000,000     150,000,000  
Revolving facilities | 4 April 2025          
Disclosure of detailed information about borrowings          
Principal amount / Notional amount 150,000,000        
Accrued interest on senior secured notes and revolving credit facilities          
Disclosure of detailed information about borrowings          
Total borrowings £ 5,187,000     £ 5,605,000  
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        
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%    
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%