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Revenues and Contract Balances - Disaggregation of Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
Disaggregation Of Revenue [Line Items] |  |
Revenues | $ 2,287,623 | $ 2,056,889
Expertise |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 986,891 | 988,265
Technology |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 1,300,732 | 1,068,624
Prime contractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 2,076,899 | 1,880,419
Subcontractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 210,724 | 176,470
Department of Defense |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 1,179,626 | 1,087,288
Intelligence Community |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 596,429 | 534,343
Federal civilian agencies |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 411,730 | 352,219
Commercial and other |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 99,838 | 83,039
Cost-plus-fee |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 1,382,630 | 1,280,010
Fixed-price |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 611,493 | 475,256
Time-and-materials |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 293,500 | 301,623
Domestic |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 2,210,044 | 1,996,321
Domestic | Expertise |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 936,344 | 956,496
Domestic | Technology |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 1,273,700 | 1,039,825
Domestic | Prime contractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 2,006,508 | 1,826,763
Domestic | Subcontractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 203,536 | 169,558
Domestic | Department of Defense |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 1,179,626 | 1,087,288
Domestic | Intelligence Community |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 596,429 | 534,343
Domestic | Federal civilian agencies |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 411,730 | 352,219
Domestic | Commercial and other |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 22,259 | 22,471
Domestic | Cost-plus-fee |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 1,382,630 | 1,280,010
Domestic | Fixed-price |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 564,825 | 439,240
Domestic | Time-and-materials |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 262,589 | 277,071
International |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 77,579 | 60,568
International | Expertise |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 50,547 | 31,769
International | Technology |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 27,032 | 28,799
International | Prime contractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 70,391 | 53,656
International | Subcontractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 7,188 | 6,912
International | Department of Defense |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 0 | 0
International | Intelligence Community |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 0 | 0
International | Federal civilian agencies |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 0 | 0
International | Commercial and other |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 77,579 | 60,568
International | Cost-plus-fee |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 0 | 0
International | Fixed-price |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 46,668 | 36,016
International | Time-and-materials |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | $ 30,911 | $ 24,552

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