Revenues and Contract Balances - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Change In Accounting Estimate [Line Items]
Income before income taxes	$ 105,786,000	$ 110,925,000	$ 217,564,000	$ 227,535,000
Diluted earnings per share (in dollars per shares)	$ 3.74	$ 3.68	$ 7.50	$ 7.44
EAC Adjustments
Change In Accounting Estimate [Line Items]
Income before income taxes	$ 14,600,000	$ 5,800,000	$ 17,000,000	$ 11,500,000
Diluted earnings per share (in dollars per shares)	$ 0.49	$ 0.18	$ 0.56	$ 0.36
Revenue from previously satisfied performance obligations	$ 0	$ 0	$ 0	$ 0