Retirement Benefits - Summary of defined benefit pension plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Change in plan assets
Fair value of plan assets at beginning of year	$ 4,362,153
Fair value of plan assets at end of year	5,455,294	$ 4,362,153
Amounts recognized on the Consolidated Balance Sheet
Pensions and other postretirement benefits	(551,510)	(639,939)
Pension Plan
Change in benefit obligation
Benefit obligation at beginning of year	4,959,319	6,323,003
Service cost	57,418	76,638	$ 84,188
Interest cost	225,468	110,250	102,475
Acquisition	1,181,139	0
Plan amendments	2,521	(5,691)
Divestiture	(1,779)	0
Actuarial gain	(349,476)	(1,097,053)
Benefits paid	(312,758)	(256,868)
Foreign currency translation and other	73,839	(190,960)
Benefit obligation at end of year	5,835,691	4,959,319	6,323,003
Change in plan assets
Fair value of plan assets at beginning of year	4,362,153	5,305,577
Actual gain (loss) on plan assets	31,399	(605,642)
Acquisition	1,140,707	0
Employer contributions	153,038	96,717
Benefits paid	(312,758)	(256,868)
Foreign currency translation and other	80,756	(177,631)
Fair value of plan assets at end of year	5,455,295	4,362,153	$ 5,305,577
Funded status	(380,396)	(597,166)
Amounts recognized on the Consolidated Balance Sheet
Investments and other assets	145,809	103,632
Other accrued liabilities	(57,783)	(19,307)
Pensions and other postretirement benefits	(468,422)	(681,491)
Net amount recognized	(380,396)	(597,166)
Amounts recognized in Accumulated Other Comprehensive (Loss)
Net actuarial loss	593,937	672,775
Prior service cost	6,489	4,901
Net amount recognized	$ 600,426	$ 677,676