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Financial risk management - Market risk (Details)
€ in Thousands
12 Months Ended
Jun. 30, 2019
EUR (€)
€ / £
Jun. 30, 2018
EUR (€)
€ / £
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
EUR (€)
$ / £
Jun. 30, 2018
EUR (€)
€ / £
Jun. 30, 2018
EUR (€)
Jun. 30, 2018
GBP (£)
Jun. 30, 2017
EUR (€)
Jun. 30, 2017
USD ($)
Jun. 30, 2017
GBP (£)
$ / £
Jun. 30, 2017
GBP (£)
€ / £
Jun. 30, 2017
GBP (£)
Jun. 30, 2019
USD ($)
Jun. 30, 2019
GBP (£)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
GBP (£)
Jun. 30, 2016
GBP (£)
Details of currency and interest rate risks                                                
Revenue               £ 627,122,000           £ 589,758,000 [1]         £ 581,254,000 [1]          
Forward foreign currency contracts outstanding at the balance sheet date                                                
Average exchange rate         1.2959 1.1346         1.3465 1.1327         1.2774 1.1663            
Derivative financial instruments, assets                                         £ 342,000   £ 5,966,000  
Foreign currency denominated monetary assets and monetary liabilities                                                
Trade receivables                                         33,740,000   123,797,000  
Derivative financial assets                                         342,000   5,966,000  
Cash and cash equivalents                                 £ 290,267,000 £ 290,267,000 £ 290,267,000   307,637,000   242,022,000 £ 229,194,000
Trade and other payables                                         (309,569,000)   (372,267,000)  
Borrowings                                         (511,232,000)   (495,768,000)  
Derivative financial liabilities                                         (2,298,000)      
Embedded foreign exchange derivatives                                                
Forward foreign currency contracts outstanding at the balance sheet date                                                
Derivative financial instruments, assets                                         245,000   624,000  
Foreign currency denominated monetary assets and monetary liabilities                                                
Derivative financial assets                                         245,000   624,000  
Buy Euro | Forward foreign currency contracts                                                
Forward foreign currency contracts outstanding at the balance sheet date                                                
Average exchange rate | € / £ 1.1272 1.1523                                            
Principal amount / Notional amount € 6,639 € 46,000 € 6,639   € 6,639 € 6,639 € 6,639   € 46,000   € 46,000 € 46,000 € 46,000               5,890,000   39,919,000  
Derivative financial instruments, assets                                         97,000   852,000  
Foreign currency denominated monetary assets and monetary liabilities                                                
Derivative financial assets                                         97,000   852,000  
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 | €     € 94,400           € 43,400           € 47,200                  
Forward foreign currency contracts outstanding at the balance sheet date                                                
Derivative financial instruments, assets                                             852,000  
Foreign currency denominated monetary assets and monetary liabilities                                                
Contract assets - accrued revenue                                         713,000      
Trade receivables                                         10,286,000   10,720,000  
Derivative financial assets                                             852,000  
Cash and cash equivalents                                         30,276,000   61,854,000  
Trade and other payables                                         (22,657,000)   (137,018,000)  
Exposure to foreign currency, net                                         18,618,000   (63,592,000)  
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               (2,100,000)           4,200,000                    
Increase (decrease) in equity due to reasonably possible strengthening of GBP against currency                                         (2,100,000)   4,200,000  
Increase (decrease) in post-tax profit due to reasonably possible weakening of GBP against currency               1,600,000           (5,200,000)                    
Increase (decrease) in equity due to reasonably possible weakening of GBP against currency                                         1,600,000   (5,200,000)  
US dollar                                                
Details of currency and interest rate risks                                                
Revenue | $       $ 155,900,000           $ 164,400,000           $ 157,900,000                
Forward foreign currency contracts outstanding at the balance sheet date                                                
Derivative financial instruments, assets                                             5,114,000  
Foreign currency denominated monetary assets and monetary liabilities                                                
Contract assets - accrued revenue                                         1,316,000      
Trade receivables                                         10,718,000   89,262,000  
Derivative financial assets                                             5,114,000  
Cash and cash equivalents                                         244,156,000   127,688,000  
Trade and other payables                                         (1,609,000)   (1,033,000)  
Borrowings                                         (505,779,000)   (492,018,000)  
Derivative financial liabilities                                         (2,298,000)      
Exposure to foreign currency, net                                         (253,496,000)   (270,987,000)  
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               21,800,000           17,800,000                    
Increase (decrease) in equity due to reasonably possible strengthening of GBP against currency                                         21,800,000   17,800,000  
Increase (decrease) in post-tax profit due to reasonably possible weakening of GBP against currency               £ (29,600,000)           £ (21,700,000)                    
Increase (decrease) in equity due to reasonably possible weakening of GBP against currency                                         £ (29,600,000)   £ (21,700,000)  
Secured term loan facility and senior secured notes                                                
Forward foreign currency contracts outstanding at the balance sheet date                                                
Principal amount / Notional amount | $                                       $ 650,000,000   $ 650,000,000    
[1] Comparative amounts have been restated—see note 33 for further details.