Revenues - Narratives (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Remaining Performance Obligations [Line Items]
Income before income taxes	$ 483,639	$ 454,572	$ 499,615
Diluted earnings per share (in dollars per shares)	$ 16.43	$ 15.49	$ 18.30
Remaining performance obligations	$ 9,200,000
Liability, revenue recognized	$ 84,800	$ 74,200
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-07-01
Remaining Performance Obligations [Line Items]
Remaining performance obligations, expected satisfaction (as a percent)	48.00%
Remaining performance obligations, expected timing of satisfaction	12 months
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)	72.00%
Remaining performance obligations, expected timing of satisfaction	24 months
EAC Adjustments
Remaining Performance Obligations [Line Items]
Income before income taxes	$ 23,400	$ 29,800	$ 44,100
Diluted earnings per share (in dollars per shares)	$ 0.74	$ 0.93	$ 1.30
Revenue from previously satisfied performance obligations	$ 1,700	$ 0	$ 2,500