Retirement Benefits - Summary of defined benefit pension plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Change in plan assets
Fair value of plan assets at beginning of year	$ 5,455,294
Fair value of plan assets at end of year	5,366,107	$ 5,455,294
Amounts recognized on the Consolidated Balance Sheet
Pensions and other postretirement benefits	(437,490)	(551,510)
Pension Plan | United States
Change in benefit obligation
Benefit obligation at beginning of year	4,007,740	3,939,482
Service cost	29,303	34,705	$ 48,382
Interest cost	189,505	165,074	92,475
Acquisition	0	320,401
Plan amendments	16,656	2,521
Divestiture	0	0
Actuarial gain	(105,971)	(210,414)
Benefits paid	(414,054)	(244,029)
Foreign currency translation and other	0	0
Benefit obligation at end of year	3,723,179	4,007,740	3,939,482
Change in plan assets
Fair value of plan assets at beginning of year	3,548,112	3,353,420
Actual gain (loss) on plan assets	179,145	161,568
Acquisition	0	263,927
Employer contributions	49,888	13,226
Benefits paid	(414,054)	(244,029)
Foreign currency translation and other	0	0
Fair value of plan assets at end of year	3,363,091	3,548,112	3,353,420
Funded status	(360,088)	(459,628)
Amounts recognized on the Consolidated Balance Sheet
Investments and other assets	0	0
Other accrued liabilities	(62,967)	(57,023)
Pensions and other postretirement benefits	(297,121)	(402,605)
Net amount recognized	(360,088)	(459,628)
Amounts recognized in Accumulated Other Comprehensive (Loss)
Net actuarial loss	315,206	344,395
Prior service cost	20,259	4,511
Net amount recognized	335,465	348,906
Pension Plan | Non-U.S. Pension Benefits
Change in benefit obligation
Benefit obligation at beginning of year	1,827,951	1,019,837
Service cost	22,033	22,713	28,256
Interest cost	79,489	60,394	17,775
Acquisition	0	860,738
Plan amendments	0	0
Divestiture	0	(1,779)
Actuarial gain	(5,863)	(139,062)
Benefits paid	(81,028)	(68,729)
Foreign currency translation and other	(26,060)	73,839
Benefit obligation at end of year	1,816,522	1,827,951	1,019,837
Change in plan assets
Fair value of plan assets at beginning of year	1,907,183	1,008,733
Actual gain (loss) on plan assets	97,737	(130,169)
Acquisition	0	876,780
Employer contributions	105,273	139,812
Benefits paid	(81,028)	(68,729)
Foreign currency translation and other	(26,149)	80,756
Fair value of plan assets at end of year	2,003,016	1,907,183	$ 1,008,733
Funded status	186,494	79,232
Amounts recognized on the Consolidated Balance Sheet
Investments and other assets	243,783	145,809
Other accrued liabilities	(832)	(760)
Pensions and other postretirement benefits	(56,457)	(65,817)
Net amount recognized	186,494	79,232
Amounts recognized in Accumulated Other Comprehensive (Loss)
Net actuarial loss	232,967	249,542
Prior service cost	1,619	1,978
Net amount recognized	$ 234,586	$ 251,520