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Financial risk management - Market risk (Details) € in Thousands, $ in Millions | 12 Months Ended |  |  |
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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 |  |

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