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Equity - Other contributed equity - Additional Information (Detail) - shares
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Nov. 17, 2017
Nov. 30, 2016
Oct. 31, 2016
Sep. 14, 2016
Sep. 05, 2016
Jul. 01, 2016
Statement of changes in equity [abstract]                
Number of ordinary shares issued 48,409,621 483,287,914 (434,958,293) 80,000   20,000,000 400,000 429,733,982
Number of ordinary shares available for conversion 1,865,000       16,000,000      
Percentage of capital acquired by third party for early conversion of convertibles notes   50.00%            
Number of convertible note may be converted into ordinary shares 1,856,000