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Employee benefits (Details) - shares
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Employee Benefits      
At the beginning 3,507,947 3,619,599 4,439,507
Additions
Disposals (10,169) (117,367)
Granted (160,746) (101,483) (702,541)
At the end 3,347,201 3,507,947 3,619,599