Revenues and Contract Balances - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Change In Accounting Estimate [Line Items]
Income before income taxes	$ 137,232,000	$ 105,786,000	$ 293,103,000	$ 217,564,000
Diluted earnings per share (in dollars per share)	$ 4.88	$ 3.74	$ 10.21	$ 7.50
EAC Adjustments
Change In Accounting Estimate [Line Items]
Income before income taxes	$ 4,000,000.0	$ 14,600,000	$ 7,700,000	$ 17,000,000.0
Diluted earnings per share (in dollars per share)	$ 0.13	$ 0.49	$ 0.26	$ 0.56
Revenue from previously satisfied performance obligations	$ 0	$ 0	$ 0	$ 0