Development costs - Additional Information (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Development Costs [Abstract] | ||
| Engineering expenditures | $ 36,757 | $ 36,503 |
| Accumulated depreciation and repayments | Development costs | ||
| Intangible assets | ||
| Amortization | $ 6,147 | $ 5,646 |