Financial instruments - Financial assets and liabilities measured at fair value (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024
Assets:
Derivatives	$ 7,115	$ 23,950
Liabilities:
Derivatives	8,154	280
Quoted Prices In Active Markets (Level 1)
Assets:
Derivatives	0	0
Liabilities:
Derivatives	0	0
Significant Other Observable Inputs (Level 2)
Assets:
Derivatives	7,115	23,950
Liabilities:
Derivatives	8,154	280
Significant Unobservable Inputs (Level 3)
Assets:
Derivatives	0	0
Liabilities:
Derivatives	$ 0	$ 0