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Equity - Summary of Reconciliation of Reserves (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 25, 2015
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure Of Reserves Within Equity [Line Items]        
Opening balance   $ 31,243    
Fair value of share-based payments   5,959 $ 5,036 $ 3,149
Reclassification of modified options to liability $ 600 134 (103) 1,244
Currency gain/(loss) on translation of foreign operations   (903) 316  
Closing Balance   36,719 31,243  
Share-Based Payments Reserve        
Disclosure Of Reserves Within Equity [Line Items]        
Opening balance   69,919 64,999  
Transfer to ordinary shares on exercise of options   (38) (13)  
Fair value of share-based payments   5,959 5,036  
Reclassification of modified options to liability   134 (103)  
Closing Balance   75,974 69,919 64,999
Investment Revaluation Reserve        
Disclosure Of Reserves Within Equity [Line Items]        
Opening balance   (303) (334)  
Changes in the fair value of available-for-sale financial assets   324 31  
Closing Balance   21 (303) (334)
Foreign Currency Translation Reserve        
Disclosure Of Reserves Within Equity [Line Items]        
Opening balance   (38,373) (38,689)  
Closing Balance   $ (39,276) $ (38,373) $ (38,689)