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Financial risk management - Market risk (Details)
€ in Thousands, $ in Millions
12 Months Ended
Jun. 30, 2020
EUR (€)
Jun. 30, 2020
USD ($)
Jun. 30, 2020
EUR (€)
$ / £
Jun. 30, 2020
EUR (€)
€ / £
Jun. 30, 2020
EUR (€)
Jun. 30, 2020
GBP (£)
Jun. 30, 2019
EUR (€)
Jun. 30, 2019
USD ($)
Jun. 30, 2019
EUR (€)
$ / £
Jun. 30, 2019
EUR (€)
€ / £
Jun. 30, 2019
EUR (€)
Jun. 30, 2019
GBP (£)
Jun. 30, 2018
EUR (€)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
GBP (£)
$ / £
Jun. 30, 2018
GBP (£)
€ / £
Jun. 30, 2018
GBP (£)
Jun. 30, 2020
USD ($)
Jun. 30, 2020
GBP (£)
Jun. 30, 2019
USD ($)
Jun. 30, 2019
GBP (£)
Jun. 30, 2017
GBP (£)
Details of currency and interest rate risks                                            
Revenue from contracts with customers           £ 509,041,000           £ 627,122,000         £ 589,758,000          
Forward foreign currency contracts outstanding at the balance sheet date                                            
Average exchange rate     1.2633 1.1391         1.2959 1.1346         1.3465 1.1327            
Derivative financial instruments, assets                                     £ 2,783,000   £ 342,000  
Foreign currency denominated monetary assets and monetary liabilities                                            
Trade receivables                                     159,679,000   33,740,000  
Cash and cash equivalents                             £ 242,022,000 £ 242,022,000 £ 242,022,000   51,539,000   307,637,000 £ 290,267,000
Trade and other payables                                     (267,415,000)   (309,569,000)  
Borrowings                                     (525,615,000)   (511,232,000)  
Derivative financial liabilities                                     (9,136,000)   (2,298,000)  
Embedded foreign exchange derivatives                                            
Forward foreign currency contracts outstanding at the balance sheet date                                            
Derivative financial instruments, assets                                     150,000   245,000  
Buy Euro | Forward foreign currency contracts                                            
Forward foreign currency contracts outstanding at the balance sheet date                                            
Average exchange rate | € / £       1.1626           1.1272                        
Principal amount / Notional amount € 46,976   € 46,976 € 46,976 € 46,976   € 6,639   € 6,639 € 6,639 € 6,639               40,405,000   5,890,000  
Derivative financial instruments, assets                                     2,633,000   97,000  
Interest rate risk                                            
Foreign currency denominated monetary assets and monetary liabilities                                            
Percentage of reasonably possible change in risk assumption         1.00%           1.00%                      
Euro                                            
Details of currency and interest rate risks                                            
Revenue from contracts with customers | € € 19,200           € 94,400           € 43,400                  
Foreign currency denominated monetary assets and monetary liabilities                                            
Contract assets - accrued revenue                                     2,945,000   713,000  
Trade receivables                                     56,226,000   10,286,000  
Cash and cash equivalents                                     24,219,000   30,276,000  
Trade and other payables                                     (55,193,000)   (22,657,000)  
Exposure to foreign currency, net                                     28,197,000   18,618,000  
Euro | Currency risk                                            
Foreign currency denominated monetary assets and monetary liabilities                                            
Percentage of reasonably possible change in risk assumption         10.00%           10.00%                      
Increase (decrease) in post-tax profit due to reasonably possible strengthening of GBP against currency           (2,000,000)           (2,100,000)                    
Increase (decrease) in equity due to reasonably possible strengthening of GBP against currency                                     (2,000,000)   (2,100,000)  
Increase (decrease) in post-tax profit due to reasonably possible weakening of GBP against currency           2,500,000           1,600,000                    
Increase (decrease) in equity due to reasonably possible weakening of GBP against currency                                     2,500,000   1,600,000  
US dollar                                            
Details of currency and interest rate risks                                            
Revenue from contracts with customers | $   $ 147.5           $ 155.9           $ 164.4                
Foreign currency denominated monetary assets and monetary liabilities                                            
Contract assets - accrued revenue                                     2,277,000   1,316,000  
Trade receivables                                     88,554,000   10,718,000  
Cash and cash equivalents                                     2,642,000   244,156,000  
Trade and other payables                                     (1,685,000)   (1,609,000)  
Borrowings                                     (525,615,000)   (505,779,000)  
Derivative financial liabilities                                     (9,136,000)   (2,298,000)  
Exposure to foreign currency, net                                     (442,963,000)   (253,496,000)  
US dollar | Currency risk                                            
Foreign currency denominated monetary assets and monetary liabilities                                            
Percentage of reasonably possible change in risk assumption         10.00%           10.00%                      
Increase (decrease) in post-tax profit due to reasonably possible strengthening of GBP against currency           31,800,000           21,800,000                    
Increase (decrease) in equity due to reasonably possible strengthening of GBP against currency                                     31,800,000   21,800,000  
Increase (decrease) in post-tax profit due to reasonably possible weakening of GBP against currency           £ (38,900,000)           £ (29,600,000)                    
Increase (decrease) in equity due to reasonably possible weakening of GBP against currency                                     £ (38,900,000)   £ (29,600,000)  
Secured term loan facility and senior secured notes                                            
Forward foreign currency contracts outstanding at the balance sheet date                                            
Principal amount / Notional amount | $                                   $ 650.0   $ 650.0