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Financial risk management - Market risk (Details)
€ in Thousands, $ in Millions
 12 Months Ended
Jun. 30, 2022
GBP (£)
Jun. 30, 2022
GBP (£)
€ / £
Jun. 30, 2022
GBP (£)
$ / £
Jun. 30, 2022
USD ($)
Jun. 30, 2022
EUR (€)
Jun. 30, 2022
GBP (£)
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 ($)
Jun. 30, 2020
EUR (€)
Jun. 30, 2022
USD ($)
Jun. 30, 2022
EUR (€)
Jun. 30, 2021
USD ($)
Jun. 30, 2021
EUR (€)
Jun. 30, 2019
GBP (£)
Details of currency and interest rate risks                                            
Revenue from contracts with customers £ 583,201,000           £ 494,117,000           £ 509,041,000                  
Forward foreign currency contracts outstanding at the balance sheet date                                            
Average exchange rate   1.1787 1.3288         1.1382 1.3461         1.1391 1.2633              
Foreign currency denominated monetary assets and monetary liabilities                                            
Trade receivables 78,967,000 £ 78,967,000 £ 78,967,000     £ 78,967,000 70,774,000 £ 70,774,000 £ 70,774,000     £ 70,774,000                    
Cash and cash equivalents 121,223,000 121,223,000 121,223,000     121,223,000 110,658,000 110,658,000 110,658,000     110,658,000 £ 51,539,000 £ 51,539,000 £ 51,539,000             £ 307,637,000
Derivative financial assets 23,059,000 23,059,000 23,059,000     23,059,000 817,000 817,000 817,000     817,000                    
Trade and other payables (322,934,000) (322,934,000) (322,934,000)     (322,934,000) (260,178,000) (260,178,000) (260,178,000)     (260,178,000)                    
Borrowings (636,122,000) (636,122,000) (636,122,000)     (636,122,000) (530,236,000) (530,236,000) (530,236,000)     (530,236,000)                    
Derivative financial liabilities (81,000) (81,000) (81,000)     (81,000) (5,734,000) (5,734,000) (5,734,000)     (5,734,000)                    
Embedded foreign exchange derivatives                                            
Foreign currency denominated monetary assets and monetary liabilities                                            
Derivative financial assets 20,286,000 20,286,000 20,286,000     20,286,000 809,000 809,000 809,000     809,000                    
Derivative financial liabilities 0 £ 0 0     0 (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 | € / £   1.1675           1.1573                            
Principal amount / Notional amount 73,885,000 £ 73,885,000 73,885,000     73,885,000 29,875,000 £ 29,875,000 29,875,000     29,875,000             € 86,262   € 34,576  
Foreign currency denominated monetary assets and monetary liabilities                                            
Derivative financial assets 234,000 234,000 234,000     £ 234,000                                
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 | €         € 79,600           € 84,100           € 19,200          
Foreign currency denominated monetary assets and monetary liabilities                                            
Contract assets - accrued revenue 1,890,000 1,890,000 1,890,000     £ 1,890,000 4,477,000 4,477,000 4,477,000     £ 4,477,000                    
Trade receivables 28,832,000 28,832,000 28,832,000     28,832,000 44,855,000 44,855,000 44,855,000     44,855,000                    
Cash and cash equivalents 49,277,000 49,277,000 49,277,000     49,277,000 57,004,000 57,004,000 57,004,000     57,004,000                    
Trade and other payables (120,994,000) (120,994,000) (120,994,000)     (120,994,000) (90,608,000) (90,608,000) (90,608,000)     (90,608,000)                    
Exposure to foreign currency, net (40,995,000) (40,995,000) (40,995,000)     £ (40,995,000) 15,728,000 15,728,000 15,728,000     £ 15,728,000                    
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 3,000,000.0           (1,100,000)                              
Increase (decrease) in equity due to reasonably possible strengthening of GBP against currency 3,000,000 3,000,000 3,000,000     £ 3,000,000 (1,100,000) (1,100,000) (1,100,000)     £ (1,100,000)                    
Increase (decrease) in post-tax profit due to reasonably possible weakening of GBP against currency (3,700,000)           1,700,000                              
Increase (decrease) in equity due to reasonably possible weakening of GBP against currency (3,700,000) (3,700,000) (3,700,000)     (3,700,000) 1,700,000 1,700,000 1,700,000     1,700,000                    
US dollar                                            
Details of currency and interest rate risks                                            
Revenue from contracts with customers | $       $ 106.1           $ 59.6           $ 147.5            
Foreign currency denominated monetary assets and monetary liabilities                                            
Contract assets - accrued revenue 250,000 250,000 250,000     250,000 2,499,000 2,499,000 2,499,000     2,499,000                    
Trade receivables 15,575,000 15,575,000 15,575,000     15,575,000 10,274,000 10,274,000 10,274,000     10,274,000                    
Cash and cash equivalents 32,460,000 32,460,000 32,460,000     32,460,000 17,290,000 17,290,000 17,290,000     17,290,000                    
Derivative financial assets 2,458,000 2,458,000 2,458,000     2,458,000                                
Trade and other payables (149,000) (149,000) (149,000)     (149,000) (454,000) (454,000) (454,000)     (454,000)                    
Borrowings (536,038,000) (536,038,000) (536,038,000)     (536,038,000) (470,068,000) (470,068,000) (470,068,000)     (470,068,000)                    
Derivative financial liabilities             (5,121,000) (5,121,000) (5,121,000)     (5,121,000)                    
Exposure to foreign currency, net (485,444,000) (485,444,000) (485,444,000)     £ (485,444,000) (445,580,000) (445,580,000) (445,580,000)     £ (445,580,000)                    
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 35,700,000           31,900,000                              
Increase (decrease) in equity due to reasonably possible strengthening of GBP against currency 35,700,000 35,700,000 35,700,000     £ 35,700,000 31,900,000 31,900,000 31,900,000     £ 31,900,000                    
Increase (decrease) in post-tax profit due to reasonably possible weakening of GBP against currency (43,700,000)           (39,200,000)                              
Increase (decrease) in equity due to reasonably possible weakening of GBP against currency £ (43,700,000) £ (43,700,000) £ (43,700,000)     £ (43,700,000) £ (39,200,000) £ (39,200,000) £ (39,200,000)     £ (39,200,000)                    
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