Development costs - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
Jun. 30, 2025	Jun. 30, 2024
Development Costs [Abstract]
Engineering expenditures	$ 36,503	$ 35,063
Accumulated depreciation and repayments \| Development costs
Intangible assets
Amortization	$ 5,646	$ 4,480

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