Income Taxes - Differences comprising the net deferred taxes shown on consolidated balance sheet (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Income Tax Disclosure [Abstract]
Retirement benefits	$ 123,951	$ 158,560
Other liabilities and reserves	213,866	240,821
Long-term contracts	45,279	37,747
Stock-based compensation	34,141	33,374
Loss carryforwards	1,063,837	1,083,732
Inventory	67,917	96,501
Capitalized research and development	145,697	92,191
Tax credit carryforwards	36,062	18,773
Unrealized currency exchange gains and losses	(18,302)	(1,680)
Undistributed foreign earnings	(30,468)	(21,304)
Depreciation and amortization	(2,103,689)	(2,228,606)
Valuation allowance	(1,069,510)	(1,078,354)
Net deferred tax (liability)	(1,491,219)	(1,568,245)
Change in net deferred tax (liability):
Provision for deferred tax	(32,476)	(91,865)	$ 351,201
Items of other comprehensive (loss) income	(23,514)	(64,342)
Acquisitions and other	133,016	(1,215,579)
Total change in net deferred tax	$ 77,026	$ (1,371,786)