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Financial risk management - Movements on the hedging reserve (Details) - GBP (£)
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Movements on the hedging reserve      
Reserve of cash flow hedges, beginning balance £ (27,558,000) [1] £ (31,271,000) [1] £ (32,877,000)
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges      
Exchange differences on hedged foreign exchange risks (6,182,000) 6,338,000 (11,874,000)
Reclassified to profit or loss 6,250,000 13,914,000 5,290,000
Change in fair value (6,788,000) 5,145,000 9,055,000
Tax relating to above (1,266,000) (21,684,000) [1] (865,000) [1]
Movement recognized in other comprehensive income (7,986,000) 3,713,000 1,606,000
Reserve of cash flow hedges, ending balance (35,544,000) (27,558,000) [1] (31,271,000) [1]
Movements on hedging reserve before tax      
Reserve of cash flow hedges, before tax, beginning balance (22,713,000) (48,110,000) (50,581,000)
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges, before tax      
Exchange differences on hedged foreign exchange risks (6,182,000) 6,338,000 (11,874,000)
Reclassified to profit or loss 6,250,000 13,914,000 5,290,000
Change in fair value (6,788,000) 5,145,000 9,055,000
Movement recognized in other comprehensive income (loss) (6,720,000) 25,397,000 [1] 2,471,000 [1]
Reserve of cash flow hedges, before tax, ending balance (29,433,000) (22,713,000) (48,110,000)
Movements on hedging reserve tax      
Reserve of cash flow hedges, tax, beginning balance (4,845,000) 16,839,000 17,704,000
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges, tax      
Tax expense relating to movements on hedges (1,266,000) (21,684,000) [1] (865,000) [1]
Reserve of cash flow hedges, tax, ending balance (6,111,000) (4,845,000) 16,839,000
As previously reported      
Movements on the hedging reserve      
Reserve of cash flow hedges, beginning balance (27,738,000) (31,724,000) (32,989,000)
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges      
Tax relating to above   (21,892,000) (681,000)
Reserve of cash flow hedges, ending balance   (27,738,000) (31,724,000)
Movements on hedging reserve before tax      
Reserve of cash flow hedges, before tax, beginning balance     (50,753,000)
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges, before tax      
Movement recognized in other comprehensive income (loss)   25,878,000 1,946,000
Movements on hedging reserve tax      
Reserve of cash flow hedges, tax, beginning balance     17,764,000
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges, tax      
Tax expense relating to movements on hedges   (21,892,000) (681,000)
Adjustment      
Movements on the hedging reserve      
Reserve of cash flow hedges, beginning balance 180,000 453,000 112,000
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges      
Tax relating to above   208,000 (184,000)
Reserve of cash flow hedges, ending balance   180,000 453,000
Movements on hedging reserve before tax      
Reserve of cash flow hedges, before tax, beginning balance     172,000
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges, before tax      
Movement recognized in other comprehensive income (loss)   (481,000) 525,000
Movements on hedging reserve tax      
Reserve of cash flow hedges, tax, beginning balance     (60,000)
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges, tax      
Tax expense relating to movements on hedges   208,000 (184,000)
Currency risk      
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges      
Exchange differences on hedged foreign exchange risks (6,350,000) 6,522,000 (11,998,000)
Reclassified to profit or loss 6,004,000 13,791,000 5,565,000
Movements on hedging reserve before tax      
Reserve of cash flow hedges, before tax, beginning balance (26,991,000) (47,304,000) (40,871,000)
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges, before tax      
Exchange differences on hedged foreign exchange risks (6,350,000) 6,522,000 (11,998,000)
Reclassified to profit or loss 6,004,000 13,791,000 5,565,000
Movement recognized in other comprehensive income (loss) (346,000) 20,313,000 (6,433,000)
Reserve of cash flow hedges, before tax, ending balance £ (27,337,000) £ (26,991,000) (47,304,000)
Currency risk | As previously reported      
Movements on hedging reserve before tax      
Reserve of cash flow hedges, before tax, beginning balance     (41,043,000)
Currency risk | Adjustment      
Movements on hedging reserve before tax      
Reserve of cash flow hedges, before tax, beginning balance     172,000
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 £ 15,093,000 £ 21,154,000  
Increase (decrease) in reserve of cash flow hedges before tax due to reasonably possible weakening of GBP against currency (18,447,000) (25,855,000)  
Interest rate risk      
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges      
Change in fair value (6,788,000) 5,145,000 9,055,000
Movements on hedging reserve before tax      
Reserve of cash flow hedges, before tax, beginning balance 4,490,000 (655,000) (9,710,000)
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges, before tax      
Change in fair value (6,788,000) 5,145,000 9,055,000
Movement recognized in other comprehensive income (loss) (6,788,000) 5,145,000 9,055,000
Reserve of cash flow hedges, before tax, ending balance £ (2,298,000) £ 4,490,000 (655,000)
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%  
Interest rate risk | As previously reported      
Movements on hedging reserve before tax      
Reserve of cash flow hedges, before tax, beginning balance     (9,710,000)
Other price risk      
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges      
Exchange differences on hedged foreign exchange risks £ 168,000 £ (184,000) 124,000
Reclassified to profit or loss 246,000 123,000 (275,000)
Movements on hedging reserve before tax      
Reserve of cash flow hedges, before tax, beginning balance (212,000) (151,000)  
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges, before tax      
Exchange differences on hedged foreign exchange risks 168,000 (184,000) 124,000
Reclassified to profit or loss 246,000 123,000 (275,000)
Movement recognized in other comprehensive income (loss) 414,000 (61,000) (151,000)
Reserve of cash flow hedges, before tax, ending balance £ 202,000 £ (212,000) (151,000)
Other price risk | As previously reported      
Movements on hedging reserve before tax      
Reserve of cash flow hedges, before tax, beginning balance     £ 0
[1] Comparative amounts have been restated—see note 33 for further details.