Financial instruments - Financial assets and liabilities measured at fair value (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Jun. 30, 2023
Assets:
Derivatives	$ 14,274	$ 21,578
Liabilities:
Derivatives	1,608
Quoted Prices In Active Markets (Level 1)
Assets:
Derivatives	0	0
Liabilities:
Derivatives	0
Significant Other Observable Inputs (Level 2)
Assets:
Derivatives	14,274	21,578
Liabilities:
Derivatives	1,608
Significant Unobservable Inputs (Level 3)
Assets:
Derivatives	0	$ 0
Liabilities:
Derivatives	$ 0