Retirement Plans (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Supplemental Savings Plan | |||
| Defined Contribution Plan Disclosure [Line Items] | |||
| Contribution expense | $ 7,000 | $ 7,200 | $ 6,900 |
| Employer contribution vesting period | 5 years | ||
| Employer contribution percentage | 5.00% | ||
| Annual IRC compensation limit | $ 360 | ||
| Supplemental savings plan obligation | 130,700 | 125,400 | |
| Supplemental savings plan COLI gains (losses) | 5,200 | 5,200 | 5,200 |
| Defined contribution plans | |||
| Defined Contribution Plan Disclosure [Line Items] | |||
| Contribution expense | 94,700 | 84,400 | 78,700 |
| Defined contribution plans | CACI $MART Plan | |||
| Defined Contribution Plan Disclosure [Line Items] | |||
| Contribution expense | $ 84,700 | $ 74,700 | $ 65,800 |
| Employer contribution vesting period | 3 years | ||