Retirement Benefits - Narrative (Details) - USD ($) $ in Thousands			12 Months Ended
	Jan. 01, 2022	Dec. 31, 2021	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Required cash balance			$ 51,000
Number of shares invested by employees in company stock (in shares)			1,081,148
Defined contribution plan, annual contributions per employee not grandfathered			3.00%
Defined contribution plan expense recognized			$ 77,000	$ 63,000	$ 57,000
Company matching contributions			$ 116,867	104,237	87,554
Meggitt plc
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined contribution plan expense recognized				11,000
Company matching contributions				9,000
United States
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Percentage of assets held in U.S. defined benefit plans from total defined plan assets			63.00%
Non-U.S. Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Percentage of assets held in U.S. defined benefit plans from total defined plan assets			24.00%
Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Maximum percentage of employer 401K matching contribution	5.00%	4.00%
Mutual funds measured at net asset value
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Investments valued using a net asset value per share, extension period			2 years
Common/Collective trusts measured at net asset value
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Investments valued using a net asset value per share, redemption notice period			90 days
Limited Partnership
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Investments valued using a net asset value per share, redemption notice period			90 days
Investments valued using a net asset value per share, redemption restriction			20.00%
Investments valued using a net asset value per share, redemption restriction, frequency period			6 months
Equity securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted-average target asset allocation			36.00%
Debt securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted-average target asset allocation			48.00%
Other investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Weighted-average target asset allocation			16.00%
Equity securities, U.S. based companies
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Company stock included in U.S. based company equity securities			$ 672,000	519,000
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated benefit obligation for all defined benefit plans			5,400,000	5,700,000
Expected cash contributions to defined benefit pension plans in next fiscal year			141,000
Pension Plan | United States
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected cash contributions to defined benefit pension plans in next fiscal year			63,000
Expense related to other postretirement benefits			$ (36,211)	$ (29,073)	57,790
Discount rate			5.27%	4.88%
Pension Plan | Non-U.S. Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected cash contributions to defined benefit pension plans in next fiscal year			$ 78,000
Expense related to other postretirement benefits			$ 13,133	$ 16,443	22,609
Pension Plan | Maximum | Non-U.S. Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate			5.23%	5.20%
Other Postretirement Benefits Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expense related to other postretirement benefits			$ 2,000	$ 2,000	1,000
Discount rate			5.23%	4.86%
Other
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Deferred compensation (income) expense			$ 23,000	$ 20,000	$ (21,000)