Other income, net - Summary of Components of Other (Income) Expense, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Other Income and Expenses [Abstract]
Foreign currency transaction loss (gain)	$ 9,413	$ (11,102)	$ 14,616	$ (27,034)
Income related to equity method investments	(48,792)	(38,868)	(125,762)	(113,523)
Non-service components of retirement benefit cost	(12,552)	(17,873)	(37,198)	(53,346)
(Gain) loss on disposal of assets and divestitures	(4,226)	3,047	(261,574)	(17,820)
Interest income	(3,378)	(2,810)	(8,626)	(8,350)
Saegertown incident	7,725	0	7,725	0
Other items, net	7,097	2,200	6,589	(8,799)
Other income, net	$ (44,713)	$ (65,406)	$ (404,230)	$ (228,872)