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Acquisition of Subsidiaries - Acquisition Date Fair Values of Each Major Class of Consideration Transferred (Details)
£ in Thousands, $ in Millions
 12 Months Ended
Jun. 30, 2018
GBP (£)
shares
Dec. 29, 2017
GBP (£)
employee
Dec. 29, 2017
USD ($)
employee
Jun. 30, 2017
Sep. 02, 2016
GBP (£)
employee
Disclosure of detailed information about business combination [line items]          
Percentage of contingent consideration per payment installment, prior to IPO 33.33%        
Velocity Partners          
Disclosure of detailed information about business combination [line items]          
Number of employees | employee   527 527    
Initial cash consideration   £ 28,586      
Fair value of deferred consideration   4,198      
Fair value of contingent consideration   10,933      
Fair value of tax refund consideration   1,170      
Total consideration transferred   44,887      
Weighted average trading price measurement period following the IPO event 30 days        
Contingent consideration payment period 3 years        
Maximum number of shares issuable on IPO (in shares) | shares 1,125,035        
Additional consideration which may be required to supplement equity issuance £ 12,100        
Tax refund consideration due to former equity holders   1,200      
Tax receivable for Washington State tax refund | $     $ 0.5    
Value added tax receivables | $     $ 1.1    
Percentage of voting equity interests acquired 100.00%        
ISDC          
Disclosure of detailed information about business combination [line items]          
Number of employees | employee         286
Initial cash consideration         £ 8,862
Total consideration transferred         £ 8,862
Percentage of voting equity interests acquired       100.00% 100.00%
Not later than one year | Velocity Partners          
Disclosure of detailed information about business combination [line items]          
Fair value of deferred consideration   3,000      
Later than one year and not later than two years | Velocity Partners          
Disclosure of detailed information about business combination [line items]          
Fair value of deferred consideration   £ 1,500