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Goodwill - Narrative (Details)
£ in Thousands
12 Months Ended
Jun. 30, 2018
GBP (£)
CGU
Jun. 30, 2017
GBP (£)
Sep. 02, 2016
Disclosure of detailed information about business combination [line items]      
Number of CGUs | CGU 1    
Terminal growth rate 1.50% 1.50%  
Velocity Partners      
Disclosure of detailed information about business combination [line items]      
Percentage of voting equity interests acquired 100.00%    
ISDC      
Disclosure of detailed information about business combination [line items]      
Percentage of voting equity interests acquired   100.00% 100.00%
Goodwill      
Disclosure of detailed information about business combination [line items]      
Acquired through business combinations £ 24,212 £ 4,200  
Goodwill | Velocity Partners      
Disclosure of detailed information about business combination [line items]      
Acquired through business combinations £ 24,212    
Goodwill | ISDC      
Disclosure of detailed information about business combination [line items]      
Acquired through business combinations   £ 4,200