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Financial risk management - Market risk (Details)
€ in Thousands
12 Months Ended
Jun. 30, 2018
EUR (€)
€ / £
Jun. 30, 2017
EUR (€)
€ / £
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
EUR (€)
$ / £
Jun. 30, 2017
EUR (€)
€ / £
Jun. 30, 2017
GBP (£)
Jun. 30, 2016
EUR (€)
Jun. 30, 2016
USD ($)
Jun. 30, 2016
$ / £
Jun. 30, 2016
€ / £
Jun. 30, 2016
GBP (£)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
GBP (£)
Jun. 30, 2017
USD ($)
Jun. 30, 2017
GBP (£)
Details of currency and interest rate risks                                            
Revenue               £ 590,022,000         £ 581,204,000         £ 515,345,000        
Forward foreign currency contracts outstanding at the balance sheet date                                            
Average exchange rate         1.3465 1.1327         1.2774 1.1663       1.4774 1.3363          
Derivative financial instruments, assets                                       £ 5,966,000   £ 4,884,000
Derivative financial instruments, liabilities                                           (1,908,000)
Foreign currency denominated monetary assets and monetary liabilities                                            
Derivative financial assets                                       5,966,000   4,884,000
Embedded foreign exchange derivatives                                            
Forward foreign currency contracts outstanding at the balance sheet date                                            
Derivative financial instruments, assets                                       624,000   1,714,000
Foreign currency denominated monetary assets and monetary liabilities                                            
Derivative financial assets                                       624,000   1,714,000
Buy Euro | Forward foreign currency contracts                                            
Details of currency and interest rate risks                                            
Principal amount / Notional amount € (46,000) € (115,283) € (46,000)   € (46,000) € (46,000) € (46,000)   € (115,283)   € (115,283) € (115,283)               (39,919,000)   (98,980,000)
Forward foreign currency contracts outstanding at the balance sheet date                                            
Average exchange rate | € / £ 1.1523 1.1647                                        
Principal amount / Notional amount € (46,000) € (115,283) (46,000)   (46,000) (46,000) € (46,000)   (115,283)   (115,283) (115,283)               (39,919,000)   (98,980,000)
Derivative financial instruments, assets                                       852,000   3,170,000
Foreign currency denominated monetary assets and monetary liabilities                                            
Derivative financial assets                                       852,000   3,170,000
Sell Euro | Forward foreign currency contracts                                            
Details of currency and interest rate risks                                            
Principal amount / Notional amount   € 10,000             10,000   10,000 10,000                   7,540,000
Forward foreign currency contracts outstanding at the balance sheet date                                            
Average exchange rate | € / £   1.3262                                        
Principal amount / Notional amount   € 10,000             10,000   10,000 10,000                   7,540,000
Derivative financial instruments, liabilities                                           (1,253,000)
Interest rate risk                                            
Foreign currency denominated monetary assets and monetary liabilities                                            
Percentage of reasonably possible change in risk assumption             1.00%                              
Euro                                            
Details of currency and interest rate risks                                            
Revenue | €     43,400           47,200         € 48,100                
Foreign currency denominated monetary assets and monetary liabilities                                            
Monetary assets in foreign currency | € 82,073 70,457 82,073   82,073 82,073 € 82,073   70,457   70,457 70,457                    
Monetary liabilities in foreign currency | € (154,951) (185,960) (154,951)   (154,951) (154,951) (154,951)   (185,960)   (185,960) (185,960)                    
Monetary assets (liabilities) in foreign currency, net | € € (72,878) € (115,503) € (72,878)   € (72,878) € (72,878) € (72,878)   € (115,503)   € (115,503) € (115,503)                    
Euro | Currency risk                                            
Foreign currency denominated monetary assets and monetary liabilities                                            
Percentage of reasonably possible change in risk assumption             10.00%                              
Increase (decrease) in post-tax profit due to reasonably possible strengthening of GBP against currency               4,200,000         6,000,000                  
Increase (decrease) in equity due to reasonably possible strengthening of GBP against currency                                       4,200,000   6,000,000
Increase (decrease) in post-tax profit due to reasonably possible weakening of GBP against currency               (5,200,000)         (7,300,000)                  
Increase (decrease) in equity due to reasonably possible weakening of GBP against currency                                       (5,200,000)   (7,300,000)
US dollar                                            
Details of currency and interest rate risks                                            
Revenue | $       $ 164,400,000           $ 157,900,000         $ 182,600,000              
Foreign currency denominated monetary assets and monetary liabilities                                            
Monetary assets in foreign currency | $                                     $ 292,168,000   $ 244,826,000  
Monetary liabilities in foreign currency | $                                     (650,531,000)   (654,507,000)  
Monetary assets (liabilities) in foreign currency, net | $                                     (358,363,000)   (409,681,000)  
US dollar | Currency risk                                            
Foreign currency denominated monetary assets and monetary liabilities                                            
Percentage of reasonably possible change in risk assumption             10.00%                              
Increase (decrease) in post-tax profit due to reasonably possible strengthening of GBP against currency               17,800,000         18,600,000                  
Increase (decrease) in equity due to reasonably possible strengthening of GBP against currency                                       17,800,000   18,600,000
Increase (decrease) in post-tax profit due to reasonably possible weakening of GBP against currency               £ (21,700,000)         £ (22,800,000)                  
Increase (decrease) in equity due to reasonably possible weakening of GBP against currency                                       £ (21,700,000)   £ (22,800,000)
Secured term loan facility and senior secured notes                                            
Details of currency and interest rate risks                                            
Principal amount / Notional amount | $                                     650,000,000   650,000,000  
Forward foreign currency contracts outstanding at the balance sheet date                                            
Principal amount / Notional amount | $                                     $ 650,000,000   $ 650,000,000