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Income tax (Details) - ARS ($)
$ in Millions
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Income Tax [Abstract]      
Current income tax $ (721) $ (1,938) $ (48)
Deferred income tax (7,252) 1,079 10,229
MPIT (134) 79 (217)
Income tax $ (8,107) $ (780) $ 9,964