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Financial risk management - Market risk (Details)
€ in Thousands, $ in Millions
 12 Months Ended
Jun. 30, 2021
GBP (£)
Jun. 30, 2021
GBP (£)
€ / £
Jun. 30, 2021
GBP (£)
$ / £
Jun. 30, 2021
USD ($)
Jun. 30, 2021
EUR (€)
Jun. 30, 2021
GBP (£)
Jun. 30, 2020
GBP (£)
Jun. 30, 2020
GBP (£)
€ / £
Jun. 30, 2020
GBP (£)
$ / £
Jun. 30, 2020
USD ($)
Jun. 30, 2020
EUR (€)
Jun. 30, 2020
GBP (£)
Jun. 30, 2019
GBP (£)
Jun. 30, 2019
GBP (£)
€ / £
Jun. 30, 2019
GBP (£)
$ / £
Jun. 30, 2019
USD ($)
Jun. 30, 2019
EUR (€)
Jun. 30, 2021
USD ($)
Jun. 30, 2021
EUR (€)
Jun. 30, 2020
USD ($)
Jun. 30, 2020
EUR (€)
Jun. 30, 2018
GBP (£)
Details of currency and interest rate risks                                            
Revenue from contracts with customers £ 494,117,000           £ 509,041,000           £ 627,122,000                  
Forward foreign currency contracts outstanding at the balance sheet date                                            
Average exchange rate   1.1382 1.3461         1.1391 1.2633         1.1346 1.2959              
Derivative financial instruments, assets 817,000 £ 817,000 £ 817,000     £ 817,000 2,783,000 £ 2,783,000 £ 2,783,000     £ 2,783,000                    
Foreign currency denominated monetary assets and monetary liabilities                                            
Trade receivables 70,774,000 70,774,000 70,774,000     70,774,000 159,679,000 159,679,000 159,679,000     159,679,000                    
Cash and cash equivalents 110,658,000 110,658,000 110,658,000     110,658,000 51,539,000 51,539,000 51,539,000     51,539,000 £ 307,637,000 £ 307,637,000 £ 307,637,000             £ 242,022,000
Trade and other payables (260,178,000) (260,178,000) (260,178,000)     (260,178,000) (267,415,000) (267,415,000) (267,415,000)     (267,415,000)                    
Borrowings (530,236,000) (530,236,000) (530,236,000)     (530,236,000) (525,615,000) (525,615,000) (525,615,000)     (525,615,000)                    
Derivative financial liabilities (5,734,000) (5,734,000) (5,734,000)     (5,734,000) (9,136,000) (9,136,000) (9,136,000)     (9,136,000)                    
Embedded foreign exchange derivatives                                            
Forward foreign currency contracts outstanding at the balance sheet date                                            
Derivative financial instruments, assets 809,000 809,000 809,000     809,000 150,000 £ 150,000 150,000     150,000                    
Foreign currency denominated monetary assets and monetary liabilities                                            
Derivative financial liabilities (527,000) £ (527,000) (527,000)     (527,000)                                
Buy Euro | Forward foreign exchange contracts                                            
Forward foreign currency contracts outstanding at the balance sheet date                                            
Average exchange rate | € / £   1.1573           1.1626                            
Principal amount / Notional amount 29,875,000 £ 29,875,000 29,875,000     29,875,000 40,405,000 £ 40,405,000 40,405,000     40,405,000             € 34,576   € 46,976  
Derivative financial instruments, assets             2,633,000 2,633,000 2,633,000     £ 2,633,000                    
Foreign currency denominated monetary assets and monetary liabilities                                            
Derivative financial liabilities (78,000) (78,000) (78,000)     £ (78,000)                                
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 | €         € 84,100           € 19,200           € 94,400          
Foreign currency denominated monetary assets and monetary liabilities                                            
Contract assets - accrued revenue 4,477,000 4,477,000 4,477,000     £ 4,477,000 2,945,000 2,945,000 2,945,000     £ 2,945,000                    
Trade receivables 44,855,000 44,855,000 44,855,000     44,855,000 56,226,000 56,226,000 56,226,000     56,226,000                    
Cash and cash equivalents 57,004,000 57,004,000 57,004,000     57,004,000 24,219,000 24,219,000 24,219,000     24,219,000                    
Trade and other payables (90,608,000) (90,608,000) (90,608,000)     (90,608,000) (55,193,000) (55,193,000) (55,193,000)     (55,193,000)                    
Exposure to foreign currency, net 15,728,000 15,728,000 15,728,000     £ 15,728,000 28,197,000 28,197,000 28,197,000     £ 28,197,000                    
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 (1,100,000)           (2,000,000.0)                              
Increase (decrease) in equity due to reasonably possible strengthening of GBP against currency (1,100,000) (1,100,000) (1,100,000)     £ (1,100,000) (2,000,000) (2,000,000) (2,000,000)     £ (2,000,000)                    
Increase (decrease) in post-tax profit due to reasonably possible weakening of GBP against currency 1,700,000           2,500,000                              
Increase (decrease) in equity due to reasonably possible weakening of GBP against currency 1,700,000 1,700,000 1,700,000     1,700,000 2,500,000 2,500,000 2,500,000     2,500,000                    
US dollar                                            
Details of currency and interest rate risks                                            
Revenue from contracts with customers | $       $ 59.6           $ 147.5           $ 155.9            
Foreign currency denominated monetary assets and monetary liabilities                                            
Contract assets - accrued revenue 2,499,000 2,499,000 2,499,000     2,499,000 2,277,000 2,277,000 2,277,000     2,277,000                    
Trade receivables 10,274,000 10,274,000 10,274,000     10,274,000 88,554,000 88,554,000 88,554,000     88,554,000                    
Cash and cash equivalents 17,290,000 17,290,000 17,290,000     17,290,000 2,642,000 2,642,000 2,642,000     2,642,000                    
Trade and other payables (454,000) (454,000) (454,000)     (454,000) (1,685,000) (1,685,000) (1,685,000)     (1,685,000)                    
Borrowings (470,068,000) (470,068,000) (470,068,000)     (470,068,000) (525,615,000) (525,615,000) (525,615,000)     (525,615,000)                    
Derivative financial liabilities (5,121,000) (5,121,000) (5,121,000)     (5,121,000) (9,136,000) (9,136,000) (9,136,000)     (9,136,000)                    
Exposure to foreign currency, net (445,580,000) (445,580,000) (445,580,000)     £ (445,580,000) (442,963,000) (442,963,000) (442,963,000)     £ (442,963,000)                    
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 31,900,000           31,800,000                              
Increase (decrease) in equity due to reasonably possible strengthening of GBP against currency 31,900,000 31,900,000 31,900,000     £ 31,900,000 31,800,000 31,800,000 31,800,000     £ 31,800,000                    
Increase (decrease) in post-tax profit due to reasonably possible weakening of GBP against currency (39,200,000)           (38,900,000)                              
Increase (decrease) in equity due to reasonably possible weakening of GBP against currency £ (39,200,000) £ (39,200,000) £ (39,200,000)     £ (39,200,000) £ (38,900,000) £ (38,900,000) £ (38,900,000)     £ (38,900,000)                    
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