Revenues - Narratives (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Remaining Performance Obligations [Line Items]
Income before income taxes	$ 544,649	$ 483,639	$ 454,572
Diluted earnings per share (in dollars per shares)	$ 18.60	$ 16.43	$ 15.49
Remaining performance obligations	$ 10,300,000
Liability, revenue recognized	$ 127,800	$ 84,800
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-07-01
Remaining Performance Obligations [Line Items]
Remaining performance obligations, expected satisfaction (as a percent)	47.00%
Remaining performance obligations, expected timing of satisfaction	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-07-01
Remaining Performance Obligations [Line Items]
Remaining performance obligations, expected satisfaction (as a percent)	69.00%
Remaining performance obligations, expected timing of satisfaction	24 months
EAC Adjustments
Remaining Performance Obligations [Line Items]
Income before income taxes	$ 25,000	$ 23,400	$ 29,800
Diluted earnings per share (in dollars per shares)	$ 0.83	$ 0.74	$ 0.93
Revenue from previously satisfied performance obligations	$ 700	$ 1,700	$ 0