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Financial risk management - Market risk (Details)
€ in Thousands, $ in Millions
 12 Months Ended
Jun. 30, 2023
GBP (£)
Jun. 30, 2023
GBP (£)
€ / £
Jun. 30, 2023
GBP (£)
$ / £
Jun. 30, 2023
USD ($)
Jun. 30, 2023
EUR (€)
Jun. 30, 2023
GBP (£)
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 ($)
Jun. 30, 2021
EUR (€)
Jun. 30, 2023
USD ($)
Jun. 30, 2023
EUR (€)
Jun. 30, 2022
USD ($)
Jun. 30, 2022
EUR (€)
Jun. 30, 2020
GBP (£)
Details of currency and interest rate risks                                            
Revenue from contracts with customers £ 648,401,000           £ 583,201,000           £ 494,117,000                  
Forward foreign currency contracts outstanding at the balance sheet date                                            
Average exchange rate   1.1524 1.2081         1.1787 1.3288         1.1382 1.3461              
Foreign currency denominated monetary assets and monetary liabilities                                            
Trade receivables 53,470,000 £ 53,470,000 £ 53,470,000     £ 53,470,000 78,967,000 £ 78,967,000 £ 78,967,000     £ 78,967,000                    
Cash and cash equivalents 76,019,000 76,019,000 76,019,000     76,019,000 121,223,000 121,223,000 121,223,000     121,223,000 £ 110,658,000 £ 110,658,000 £ 110,658,000             £ 51,539,000
Derivative financial assets 15,809,000 15,809,000 15,809,000     15,809,000 23,059,000 23,059,000 23,059,000     23,059,000                    
Trade and other payables (397,613,000) (397,613,000) (397,613,000)     (397,613,000) (322,934,000) (322,934,000) (322,934,000)     (322,934,000)                    
Borrowings (613,296,000) (613,296,000) (613,296,000)     (613,296,000) (636,122,000) (636,122,000) (636,122,000)     (636,122,000)                    
Derivative financial liabilities (1,679,000) (1,679,000) (1,679,000)     (1,679,000) (81,000) (81,000) (81,000)     (81,000)                    
Embedded foreign exchange derivatives                                            
Foreign currency denominated monetary assets and monetary liabilities                                            
Derivative financial assets 11,258,000 11,258,000 11,258,000     11,258,000 20,286,000 20,286,000 20,286,000     20,286,000                    
Derivative financial liabilities (64,000) £ (64,000) (64,000)     (64,000) 0 £ 0 0     0                    
Buy Euro | Forward foreign exchange contracts                                            
Forward foreign currency contracts outstanding at the balance sheet date                                            
Average exchange rate | € / £   1.149           1.1675                            
Principal amount / Notional amount 148,709,000 £ 148,709,000 148,709,000     148,709,000 73,885,000 £ 73,885,000 73,885,000     73,885,000             € 170,817   € 86,262  
Foreign currency denominated monetary assets and monetary liabilities                                            
Derivative financial assets             234,000 234,000 234,000     £ 234,000                    
Derivative financial liabilities (2,112,000) (2,112,000) (2,112,000)     £ (2,112,000)                                
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 | €         € 32,900           € 79,600           € 84,100          
Foreign currency denominated monetary assets and monetary liabilities                                            
Contract assets - accrued revenue 3,099,000 3,099,000 3,099,000     £ 3,099,000 1,890,000 1,890,000 1,890,000     £ 1,890,000                    
Trade receivables 8,801,000 8,801,000 8,801,000     8,801,000 28,832,000 28,832,000 28,832,000     28,832,000                    
Cash and cash equivalents 22,905,000 22,905,000 22,905,000     22,905,000 49,277,000 49,277,000 49,277,000     49,277,000                    
Trade and other payables (150,288,000) (150,288,000) (150,288,000)     (150,288,000) (120,994,000) (120,994,000) (120,994,000)     (120,994,000)                    
Exposure to foreign currency, net (115,483,000) (115,483,000) (115,483,000)     £ (115,483,000) (40,995,000) (40,995,000) (40,995,000)     £ (40,995,000)                    
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 8,900,000           3,000,000.0                              
Increase (decrease) in equity due to reasonably possible strengthening of GBP against currency 8,900,000 8,900,000 8,900,000     £ 8,900,000 3,000,000 3,000,000 3,000,000     £ 3,000,000                    
Increase (decrease) in post-tax profit due to reasonably possible weakening of GBP against currency (10,900,000)           (3,700,000)                              
Increase (decrease) in equity due to reasonably possible weakening of GBP against currency (10,900,000) (10,900,000) (10,900,000)     (10,900,000) (3,700,000) (3,700,000) (3,700,000)     (3,700,000)                    
US dollar                                            
Details of currency and interest rate risks                                            
Revenue from contracts with customers | $       $ 98.0           $ 106.1           $ 59.6            
Foreign currency denominated monetary assets and monetary liabilities                                            
Contract assets - accrued revenue 499,000 499,000 499,000     499,000 250,000 250,000 250,000     250,000                    
Trade receivables 3,730,000 3,730,000 3,730,000     3,730,000 15,575,000 15,575,000 15,575,000     15,575,000                    
Cash and cash equivalents 45,914,000 45,914,000 45,914,000     45,914,000 32,460,000 32,460,000 32,460,000     32,460,000                    
Derivative financial assets 11,258,000 11,258,000 11,258,000     11,258,000 2,458,000 2,458,000 2,458,000     2,458,000                    
Trade and other payables (3,057,000) (3,057,000) (3,057,000)     (3,057,000) (149,000) (149,000) (149,000)     (149,000)                    
Borrowings (512,788,000) (512,788,000) (512,788,000)     (512,788,000) (536,038,000) (536,038,000) (536,038,000)     (536,038,000)                    
Derivative financial liabilities (64,000) (64,000) (64,000)     (64,000)                                
Exposure to foreign currency, net (454,508,000) (454,508,000) (454,508,000)     £ (454,508,000) (485,444,000) (485,444,000) (485,444,000)     £ (485,444,000)                    
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 35,000,000.0           35,700,000                              
Increase (decrease) in equity due to reasonably possible strengthening of GBP against currency 35,000,000 35,000,000 35,000,000     £ 35,000,000 35,700,000 35,700,000 35,700,000     £ 35,700,000                    
Increase (decrease) in post-tax profit due to reasonably possible weakening of GBP against currency (42,800,000)           (43,700,000)                              
Increase (decrease) in equity due to reasonably possible weakening of GBP against currency £ (42,800,000) £ (42,800,000) £ (42,800,000)     £ (42,800,000) £ (43,700,000) £ (43,700,000) £ (43,700,000)     £ (43,700,000)                    
Secured term loan facility and senior secured notes                                            
Forward foreign currency contracts outstanding at the balance sheet date                                            
Principal amount / Notional amount | $                                   $ 650.0   $ 650.0