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Intangible assets - Significant estimates and judgments - fair value and impairment of registrations (Details) - GBP (£)
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Intangible assets      
Intangible assets and goodwill £ 768,857,000 £ 799,640,000 £ 717,544,000
Cost / gross value      
Intangible assets      
Intangible assets and goodwill 1,207,745,000 1,217,426,000 1,073,505,000
Accumulated depreciation, amortization and impairment      
Intangible assets      
Intangible assets and goodwill (438,888,000) (417,786,000) (355,961,000)
Registrations      
Intangible assets      
Intangible assets and goodwill £ 338,762,000 369,508,000 290,520,000
Useful life of assets beyond one year after current year 4 years    
Registrations | Less than 1 year      
Intangible assets      
Intangible assets and goodwill £ 124,600,000    
Registrations | Cost / gross value      
Intangible assets      
Intangible assets and goodwill 772,328,000 785,594,000 645,433,000
Registrations | Accumulated depreciation, amortization and impairment      
Intangible assets      
Intangible assets and goodwill (433,566,000) (416,086,000) (354,913,000)
Other intangible assets      
Intangible assets      
Intangible assets and goodwill 8,642,000 8,679,000 5,571,000
Other intangible assets | Cost / gross value      
Intangible assets      
Intangible assets and goodwill 13,964,000 10,379,000 6,619,000
Other intangible assets | Cost / gross value | Internally generated      
Intangible assets      
Intangible assets and goodwill 1,979,000 1,412,000  
Other intangible assets | Accumulated depreciation, amortization and impairment      
Intangible assets      
Intangible assets and goodwill (5,322,000) (1,700,000) £ (1,048,000)
Other intangible assets | Accumulated depreciation, amortization and impairment | Internally generated      
Intangible assets      
Intangible assets and goodwill £ (667,000) £ (39,000)