Revenues - Narratives (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Remaining Performance Obligations [Line Items]
Income before income taxes	$ 605,341	$ 544,649	$ 483,639
Diluted earnings per share (in dollars per shares)	$ 22.32	$ 18.60	$ 16.43
Remaining performance obligations	$ 12,100,000
Liability, revenue recognized	$ 122,500	$ 127,800
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)	44.00%
Remaining performance obligations, expected timing of satisfaction	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2026-07-01
Remaining Performance Obligations [Line Items]
Remaining performance obligations, expected satisfaction (as a percent)	63.00%
Remaining performance obligations, expected timing of satisfaction	24 months
EAC Adjustments
Remaining Performance Obligations [Line Items]
Income before income taxes	$ 15,800	$ 25,000	$ 23,400
Diluted earnings per share (in dollars per shares)	$ 0.53	$ 0.83	$ 0.74
Revenue from previously satisfied performance obligations	$ 200	$ 700	$ 1,700