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Borrowings (Details)
12 Months Ended
Jun. 30, 2019
GBP (£)
Jun. 30, 2018
GBP (£)
Jun. 30, 2019
USD ($)
Jun. 30, 2019
GBP (£)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
GBP (£)
Jun. 30, 2017
GBP (£)
Disclosure of detailed information about borrowings              
Total borrowings       £ 511,232,000   £ 495,768,000  
Non-current borrowings       505,779,000   486,694,000 £ 497,630,000
Current borrowings       5,453,000   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       330,757,000   318,347,000  
Non-current borrowings       330,757,000   318,347,000  
Unamortized issue costs on borrowings       3,414,000   3,770,000  
Principal amount / Notional amount | $     $ 425,000,000   $ 425,000,000    
Secured term loan facility              
Disclosure of detailed information about borrowings              
Total borrowings       175,022,000   168,347,000  
Non-current borrowings       175,022,000   168,347,000  
Unamortized issue costs on borrowings       1,894,000   2,185,000  
Principal amount / Notional amount | $     $ 225,000,000   $ 225,000,000    
Secured bank loan              
Disclosure of detailed information about borrowings              
Total borrowings           3,750,000  
Accrued interest on senior secured notes              
Disclosure of detailed information about borrowings              
Total borrowings       5,453,000   £ 5,324,000  
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              
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 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              
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 borrowing facility              
Disclosure of detailed information about borrowings              
Adjustment to interest rate basis     1.75% 1.75%