Equity - Reclassifications out of accumulated other comprehensive income (loss) in shareholders' equity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other income, net	$ 85,011	$ 40,641	$ 163,466	$ 60,265
Income before income taxes	868,165	516,743	1,688,600	1,020,088
Tax benefit	(186,108)	(121,282)	(355,471)	(236,590)
Net income	682,057	395,461	1,333,129	783,498
Income (Expense) Reclassified from Accumulated Other Comprehensive (Loss) | Amortization of prior service cost and initial net obligation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other income, net	(334)	(242)	(636)	(452)
Income (Expense) Reclassified from Accumulated Other Comprehensive (Loss) | Recognized actuarial loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other income, net	(2,309)	(6,369)	(3,101)	(12,479)
Income (Expense) Reclassified from Accumulated Other Comprehensive (Loss) | Retirement benefit plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income before income taxes	(2,643)	(6,611)	(3,737)	(12,931)
Tax benefit	732	1,621	1,008	3,170
Net income	$ (1,911)	$ (4,990)	$ (2,729)	$ (9,761)