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Revenues and Contract Balances - Disaggregation of Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | $ 2,166,982 | $ 1,937,456 | $ 6,323,680 | $ 5,621,537
Expertise |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 973,037 | 916,955 | 2,887,202 | 2,644,590
Technology |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 1,193,945 | 1,020,501 | 3,436,478 | 2,976,947
Prime contractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 1,955,753 | 1,741,777 | 5,698,270 | 5,027,516
Subcontractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 211,229 | 195,679 | 625,410 | 594,021
Department of Defense |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 1,652,206 | 1,452,264 | 4,765,472 | 4,163,079
Federal civilian agencies |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 431,453 | 381,214 | 1,304,515 | 1,178,500
Commercial and other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 83,323 | 103,978 | 253,693 | 279,958
Cost-plus-fee |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 1,316,805 | 1,174,219 | 3,837,028 | 3,411,128
Fixed-price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 573,464 | 520,987 | 1,651,579 | 1,542,608
Time-and-materials |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 276,713 | 242,250 | 835,073 | 667,801
Domestic |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 2,105,120 | 1,877,986 | 6,140,597 | 5,453,162
Domestic | Expertise |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 941,805 | 895,791 | 2,794,191 | 2,583,634
Domestic | Technology |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 1,163,315 | 982,195 | 3,346,406 | 2,869,528
Domestic | Prime contractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 1,900,648 | 1,689,140 | 5,535,517 | 4,878,820
Domestic | Subcontractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 204,472 | 188,846 | 605,080 | 574,342
Domestic | Department of Defense |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 1,652,206 | 1,452,264 | 4,765,472 | 4,163,079
Domestic | Federal civilian agencies |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 431,453 | 381,214 | 1,304,515 | 1,178,500
Domestic | Commercial and other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 21,461 | 44,508 | 70,610 | 111,583
Domestic | Cost-plus-fee |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 1,316,805 | 1,174,219 | 3,837,028 | 3,411,128
Domestic | Fixed-price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 533,735 | 484,980 | 1,537,759 | 1,437,282
Domestic | Time-and-materials |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 254,580 | 218,787 | 765,810 | 604,752
International |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 61,862 | 59,470 | 183,083 | 168,375
International | Expertise |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 31,232 | 21,164 | 93,011 | 60,956
International | Technology |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 30,630 | 38,306 | 90,072 | 107,419
International | Prime contractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 55,105 | 52,637 | 162,753 | 148,696
International | Subcontractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 6,757 | 6,833 | 20,330 | 19,679
International | Department of Defense |  |  |  |
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 | 61,862 | 59,470 | 183,083 | 168,375
International | Cost-plus-fee |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
International | Fixed-price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 39,729 | 36,007 | 113,820 | 105,326
International | Time-and-materials |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | $ 22,133 | $ 23,463 | $ 69,263 | $ 63,049

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