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Financial risk management - Summary of Borrowing to Price Rate Changes (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Jun. 30, 2023
Disclosure of Financial Risk Management [Line Items]    
Current borrowings $ 8,534 $ 5,952
Non-current borrowings 107,228 102,811
Total borrowings 115,762 108,763
Commodity price risk    
Disclosure of Financial Risk Management [Line Items]    
Current borrowings 367 336
Non-current borrowings 60,878 55,739
Total borrowings $ 61,245 $ 56,075
Percent of current borrowings 0.00% 0.00%
Percent of non-current borrowings 53.00% 51.00%
Percent of total borrowings 53.00% 51.00%