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Borrowings (Details)
12 Months Ended
Jun. 30, 2025
GBP (£)
Jul. 10, 2025
GBP (£)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
GBP (£)
Jun. 30, 2024
USD ($)
Disclosure of detailed information about borrowings          
Total borrowings £ 636,974,000     £ 546,621,000  
Non-current borrowings 471,855,000     511,047,000  
Current borrowings 165,119,000     35,574,000  
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 £ 308,914,000     334,538,000  
Non-current borrowings 308,914,000     334,538,000  
Unamortized issue costs on borrowings £ 1,098,000     1,615,000  
Principal amount / Notional amount | $     $ 425,000,000   $ 425,000,000
Senior secured notes | Minimum          
Disclosure of detailed information about borrowings          
Debt redemption, percentage of aggregate principal amount 5.00%        
Senior secured notes | Maximum          
Disclosure of detailed information about borrowings          
Debt redemption, percentage of aggregate principal amount 100.00%        
Senior secured notes | Fixed interest rate          
Disclosure of detailed information about borrowings          
Borrowings, interest rate 3.79%   3.79%    
Secured term loan facility          
Disclosure of detailed information about borrowings          
Total borrowings £ 162,941,000     176,509,000  
Non-current borrowings 162,941,000     176,509,000  
Unamortized issue costs on borrowings £ 1,186,000     1,456,000  
Principal amount / Notional amount | $     $ 225,000,000   $ 225,000,000
Secured term loan facility | Floating interest rate          
Disclosure of detailed information about borrowings          
Borrowings, interest rate basis SOFR        
Secured term loan facility | Floating interest rate | Minimum          
Disclosure of detailed information about borrowings          
Adjustment to interest rate basis 1.25%   1.25%    
Secured term loan facility | Floating interest rate | Maximum          
Disclosure of detailed information about borrowings          
Adjustment to interest rate basis 1.75%   1.75%    
Revolving facilities          
Disclosure of detailed information about borrowings          
Total borrowings £ 160,000,000     30,000,000  
Principal amount / Notional amount 300,000,000        
Undrawn borrowing facilities 140,000,000     270,000,000  
Revolving facilities | Revolving facilities upsize and extension          
Disclosure of detailed information about borrowings          
Principal amount / Notional amount   £ 350,000,000      
Accrued interest on senior secured notes and revolving credit facilities          
Disclosure of detailed information about borrowings          
Total borrowings £ 5,119,000     £ 5,574,000