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Revenues and Contract Balances - Disaggregation of Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2026 | Mar. 31, 2025
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | $ 2,351,002 | $ 2,166,982 | $ 6,858,722 | $ 6,323,680
Expertise |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 1,023,728 | 973,037 | 2,934,820 | 2,887,202
Technology |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 1,327,274 | 1,193,945 | 3,923,902 | 3,436,478
Prime contractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 2,125,078 | 1,955,753 | 6,211,546 | 5,698,270
Subcontractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 225,924 | 211,229 | 647,176 | 625,410
Department of Defense |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 1,295,628 | 1,180,820 | 3,627,406 | 3,387,095
Intelligence Community |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 582,235 | 552,796 | 1,717,704 | 1,614,883
Federal civilian agencies |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 373,582 | 350,044 | 1,223,944 | 1,068,005
Commercial and other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 99,557 | 83,322 | 289,668 | 253,697
Cost-plus-fee |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 1,273,227 | 1,316,805 | 3,965,968 | 3,837,028
Fixed-price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 749,908 | 573,464 | 1,959,418 | 1,651,579
Time-and-materials |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 327,867 | 276,713 | 933,336 | 835,073
Domestic |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 2,273,695 | 2,105,120 | 6,628,722 | 6,140,597
Domestic | Expertise |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 971,645 | 941,805 | 2,784,290 | 2,794,191
Domestic | Technology |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 1,302,050 | 1,163,315 | 3,844,432 | 3,346,406
Domestic | Prime contractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 2,057,271 | 1,900,648 | 6,006,308 | 5,535,517
Domestic | Subcontractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 216,424 | 204,472 | 622,414 | 605,080
Domestic | Department of Defense |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 1,295,628 | 1,180,820 | 3,627,406 | 3,387,095
Domestic | Intelligence Community |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 582,235 | 552,796 | 1,717,704 | 1,614,883
Domestic | Federal civilian agencies |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 373,582 | 350,044 | 1,223,944 | 1,068,005
Domestic | Commercial and other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 22,250 | 21,460 | 59,668 | 70,614
Domestic | Cost-plus-fee |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 1,273,227 | 1,316,805 | 3,965,968 | 3,837,028
Domestic | Fixed-price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 703,042 | 533,735 | 1,822,855 | 1,537,759
Domestic | Time-and-materials |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 297,426 | 254,580 | 839,899 | 765,810
International |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 77,307 | 61,862 | 230,000 | 183,083
International | Expertise |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 52,083 | 31,232 | 150,530 | 93,011
International | Technology |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 25,224 | 30,630 | 79,470 | 90,072
International | Prime contractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 67,807 | 55,105 | 205,238 | 162,753
International | Subcontractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 9,500 | 6,757 | 24,762 | 20,330
International | Department of Defense |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
International | Intelligence Community |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
International | Federal civilian agencies |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
International | Commercial and other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 77,307 | 61,862 | 230,000 | 183,083
International | Cost-plus-fee |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
International | Fixed-price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 46,866 | 39,729 | 136,563 | 113,820
International | Time-and-materials |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | $ 30,441 | $ 22,133 | $ 93,437 | $ 69,263

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