Revenues and Contract Balances - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Change In Accounting Estimate [Line Items]
Income before income taxes	$ 153,636,000	$ 131,464,000	$ 371,200,000	$ 358,999,000
Diluted earnings per share (in dollars per shares)	$ 5.13	$ 4.33	$ 12.63	$ 11.76
EAC Adjustments
Change In Accounting Estimate [Line Items]
Income before income taxes	$ 7,500,000	$ 5,300,000	$ 24,500,000	$ 16,800,000
Diluted earnings per share (in dollars per shares)	$ 0.25	$ 0.17	$ 0.81	$ 0.53
Revenue from previously satisfied performance obligations	$ 0	$ 0	$ 0	$ 0