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Subsequent Events (Details)
$ / shares in Units, £ in Thousands, $ in Millions
 12 Months Ended
Aug. 06, 2018
USD ($)
Jul. 27, 2018
$ / shares
shares
Jun. 30, 2018
GBP (£)
Jun. 30, 2017
GBP (£)
Jun. 30, 2016
GBP (£)
Jul. 06, 2018
Disclosure of non-adjusting events after reporting period [line items]            
Borrowings | £     £ 36,768 £ 3,462 £ 3,364  
Major ordinary share transactions            
Disclosure of non-adjusting events after reporting period [line items]            
Stock split, conversion ratio           0.20
Multicurrency Revolving Facility Agreement | Repayment of outstanding debt            
Disclosure of non-adjusting events after reporting period [line items]            
Borrowings | $ $ 26          
Borrowings maturity, term 3 years          
IPO1 | Initial public offering            
Disclosure of non-adjusting events after reporting period [line items]            
Shares issued during initial public offering (in shares)   7,291,000        
Shares issued during public offering, price per share (in usd per share) | $ / shares   $ 20.00        
Shares issued during initial public offering, offered by Endava (in shares)   3,228,995        
Shares issued during initial public offering, offered by existing shareholders (in shares)   4,062,005