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Financial risk management - Movements on the hedging reserve (Details) - GBP (£)
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Movements on the hedging reserve      
Reserve of cash flow hedges, beginning balance £ (10,436,000) £ (32,565,000) £ (35,544,000)
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges      
Exchange differences on hedged foreign exchange risks (1,433,000) 1,835,000 (2,465,000)
Reclassified to profit or loss (998,000) 16,848,000 12,180,000
Change in fair value 7,579,000 4,015,000 (6,838,000)
Tax relating to above (1,287,000) (569,000) 102,000
Movement recognized in other comprehensive income 3,861,000 22,129,000 2,979,000
Reclassified 7,525,000    
Reserve of cash flow hedges, ending balance 950,000 (10,436,000) (32,565,000)
Movements on hedging reserve before tax      
Reserve of cash flow hedges, before tax, beginning balance (3,858,000) (26,556,000) (29,433,000)
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges, before tax      
Exchange differences on hedged foreign exchange risks (1,433,000) 1,835,000 (2,465,000)
Reclassified to profit or loss (998,000) 16,848,000 12,180,000
Change in fair value 7,579,000 4,015,000 (6,838,000)
Movement recognized in other comprehensive income (loss) 5,148,000 22,698,000 2,877,000
Reclassified 7,525,000    
Reserve of cash flow hedges, before tax, ending balance 8,815,000 (3,858,000) (26,556,000)
Movements on hedging reserve tax      
Reserve of cash flow hedges, tax, beginning balance (6,578,000) (6,009,000) (6,111,000)
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges, tax      
Tax credit/(expense) relating to movements on hedges (1,287,000) (569,000) 102,000
Reserve of cash flow hedges, tax, ending balance (7,865,000) (6,578,000) (6,009,000)
Currency risk      
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges      
Exchange differences on hedged foreign exchange risks (1,733,000) 4,325,000 (2,818,000)
Reclassified to profit or loss (770,000) 14,956,000 12,214,000
Movements on hedging reserve before tax      
Reserve of cash flow hedges, before tax, beginning balance 1,340,000 (17,941,000) (27,337,000)
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges, before tax      
Exchange differences on hedged foreign exchange risks (1,733,000) 4,325,000 (2,818,000)
Reclassified to profit or loss (770,000) 14,956,000 12,214,000
Movement recognized in other comprehensive income (loss) (2,503,000) 19,281,000 9,396,000
Reserve of cash flow hedges, before tax, ending balance £ (1,163,000) £ 1,340,000 (17,941,000)
Currency risk | US dollar      
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges, tax      
Percentage of reasonably possible change in risk assumption 10.00% 10.00%  
Increase (decrease) in reserve of cash flow hedges before tax due to reasonably possible strengthening of GBP against currency £ 1,706,000 £ 4,042,000  
Increase (decrease) in reserve of cash flow hedges before tax due to reasonably possible weakening of GBP against currency (2,085,000) (4,941,000)  
Interest rate risk      
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges      
Change in fair value 7,579,000 4,015,000 (6,838,000)
Movements on hedging reserve before tax      
Reserve of cash flow hedges, before tax, beginning balance (5,121,000) (9,136,000) (2,298,000)
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges, before tax      
Change in fair value 7,579,000 4,015,000 (6,838,000)
Movement recognized in other comprehensive income (loss) 7,579,000 4,015,000 (6,838,000)
Reserve of cash flow hedges, before tax, ending balance £ 2,458,000 £ (5,121,000) (9,136,000)
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges, tax      
Percentage of reasonably possible change in risk assumption 1.00% 1.00%  
Other price risk      
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges      
Exchange differences on hedged foreign exchange risks £ 300,000 £ (2,490,000) 353,000
Reclassified to profit or loss (228,000) 1,892,000 (34,000)
Reclassified 7,525,000    
Movements on hedging reserve before tax      
Reserve of cash flow hedges, before tax, beginning balance (77,000) 521,000 202,000
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges, before tax      
Exchange differences on hedged foreign exchange risks 300,000 (2,490,000) 353,000
Reclassified to profit or loss (228,000) 1,892,000 (34,000)
Movement recognized in other comprehensive income (loss) 72,000 (598,000) 319,000
Reclassified 7,525,000    
Reserve of cash flow hedges, before tax, ending balance £ 7,520,000 £ (77,000) £ 521,000