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Other Balance Sheet Accounts - Provisions (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Jun. 30, 2017
Current provisions:    
Current employee benefits $ 7,215 $ 6,162
Non-current provisions:    
Non-current employee benefits 2,094 1,415
Dilapidation provision 2,269 1,918
Non-current provisions $ 4,363 $ 3,333