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Financial risk management - Movements on the hedging reserve (Details) - GBP (£)
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Movements on the hedging reserve      
Reserve of cash flow hedges, beginning balance £ (31,724,000) £ (32,989,000) £ 4,729,000
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges      
Foreign exchange differences on hedged currency risks 6,338,000 (11,874,000) (49,808,000)
Reclassified to income statement 14,395,000 4,765,000 4,047,000
Fair value movement 5,145,000 9,055,000 (12,264,000)
Tax impact (21,892,000) (681,000) 20,307,000
Movement recognized in other comprehensive income (loss) 3,986,000 1,265,000 (37,718,000)
Reserve of cash flow hedges, ending balance (27,738,000) (31,724,000) (32,989,000)
Movements on hedging reserve before tax      
Reserve of cash flow hedges, before tax, beginning balance (48,807,000) (50,753,000) 7,272,000
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges, before tax      
Foreign exchange differences on hedged currency risks 6,338,000 (11,874,000) (49,808,000)
Reclassified to income statement 14,395,000 4,765,000 4,047,000
Fair value movement 5,145,000 9,055,000 (12,264,000)
Movement recognized in other comprehensive income (loss) 25,878,000 1,946,000 (58,025,000)
Reserve of cash flow hedges, before tax, ending balance (22,929,000) (48,807,000) (50,753,000)
Movements on hedging reserve tax      
Reserve of cash flow hedges, tax, beginning balance 17,083,000 17,764,000 (2,543,000)
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges, tax      
Movement recognized in other comprehensive income (loss) (21,892,000) (681,000) 20,307,000
Reserve of cash flow hedges, tax, ending balance (4,809,000) 17,083,000 17,764,000
Currency risk      
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges      
Foreign exchange differences on hedged currency risks 6,522,000 (11,998,000) (49,808,000)
Reclassified to income statement 14,272,000 5,040,000 1,382,000
Movements on hedging reserve before tax      
Reserve of cash flow hedges, before tax, beginning balance (48,001,000) (41,043,000) 7,383,000
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges, before tax      
Foreign exchange differences on hedged currency risks 6,522,000 (11,998,000) (49,808,000)
Reclassified to income statement 14,272,000 5,040,000 1,382,000
Movement recognized in other comprehensive income (loss) 20,794,000 (6,958,000) (48,426,000)
Reserve of cash flow hedges, before tax, ending balance £ (27,207,000) (48,001,000) (41,043,000)
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%    
Increase (decrease) in reserve of cash flow hedges before tax due to reasonably possible strengthening of GBP against currency £ 21,154,000 20,966,000  
Increase (decrease) in reserve of cash flow hedges before tax due to reasonably possible weakening of GBP against currency (25,855,000) (25,625,000)  
Interest rate risk      
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges      
Reclassified to income statement     2,665,000
Fair value movement 5,145,000 9,055,000 (12,264,000)
Movements on hedging reserve before tax      
Reserve of cash flow hedges, before tax, beginning balance (655,000) (9,710,000) (111,000)
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges, before tax      
Reclassified to income statement     2,665,000
Fair value movement 5,145,000 9,055,000 (12,264,000)
Movement recognized in other comprehensive income (loss) 5,145,000 9,055,000 (9,599,000)
Reserve of cash flow hedges, before tax, ending balance £ 4,490,000 (655,000) (9,710,000)
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges, tax      
Percentage of reasonably possible change in risk assumption 1.00%    
Other price risk      
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges      
Foreign exchange differences on hedged currency risks £ (184,000) 124,000  
Reclassified to income statement 123,000 (275,000)  
Movements on hedging reserve before tax      
Reserve of cash flow hedges, before tax, beginning balance (151,000) 0 0
Movement recognized in other comprehensive income (loss), reserve of cash flow hedges, before tax      
Foreign exchange differences on hedged currency risks (184,000) 124,000  
Reclassified to income statement 123,000 (275,000)  
Movement recognized in other comprehensive income (loss) (61,000) (151,000)  
Reserve of cash flow hedges, before tax, ending balance £ (212,000) £ (151,000) £ 0