Financial instruments - Fair value of derivative instruments reported in consolidated balance sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024
Cross-currency swap contracts
Net investment hedges
Cross-currency swap contracts, assets	$ 20,014	$ 16,325
Cross-currency swap contracts, liability	$ 0	208
Other derivative contracts
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Investments and other assets		Investments and other assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities		Other liabilities
Forward exchange contracts
Other derivative contracts
Other derivative contracts, assets	$ 6,719	7,625
Other derivative contracts, liabilities	$ 28,040	$ 72
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Non-trade and notes receivable		Non-trade and notes receivable
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other accrued liabilities		Other accrued liabilities