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Revenues and Contract Balances - Disaggregation of Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | $ 1,937,456 | $ 1,744,270 | $ 5,621,537 | $ 4,999,445
Expertise |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 916,955 | 812,300 | 2,644,590 | 2,288,123
Technology |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 1,020,501 | 931,970 | 2,976,947 | 2,711,322
Prime contractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 1,741,777 | 1,556,733 | 5,027,516 | 4,467,882
Subcontractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 195,679 | 187,537 | 594,021 | 531,563
Department of Defense |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 1,452,264 | 1,298,700 | 4,163,079 | 3,554,080
Federal civilian agencies |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 381,214 | 355,612 | 1,178,500 | 1,179,467
Commercial and other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 103,978 | 89,958 | 279,958 | 265,898
Cost-plus-fee |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 1,174,219 | 1,008,688 | 3,411,128 | 2,896,778
Fixed-price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 520,987 | 529,786 | 1,542,608 | 1,520,915
Time-and-materials |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 242,250 | 205,796 | 667,801 | 581,752
Domestic |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 1,877,986 | 1,694,479 | 5,453,162 | 4,858,549
Domestic | Expertise |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 895,791 | 793,993 | 2,583,634 | 2,237,146
Domestic | Technology |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 982,195 | 900,486 | 2,869,528 | 2,621,403
Domestic | Prime contractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 1,689,140 | 1,511,758 | 4,878,820 | 4,339,579
Domestic | Subcontractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 188,846 | 182,721 | 574,342 | 518,970
Domestic | Department of Defense |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 1,452,264 | 1,298,700 | 4,163,079 | 3,554,080
Domestic | Federal civilian agencies |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 381,214 | 355,612 | 1,178,500 | 1,179,467
Domestic | Commercial and other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 44,508 | 40,167 | 111,583 | 125,002
Domestic | Cost-plus-fee |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 1,174,219 | 1,008,688 | 3,411,128 | 2,896,778
Domestic | Fixed-price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 484,980 | 494,095 | 1,437,282 | 1,420,858
Domestic | Time-and-materials |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 218,787 | 191,696 | 604,752 | 540,913
International |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 59,470 | 49,791 | 168,375 | 140,896
International | Expertise |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 21,164 | 18,307 | 60,956 | 50,977
International | Technology |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 38,306 | 31,484 | 107,419 | 89,919
International | Prime contractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 52,637 | 44,975 | 148,696 | 128,303
International | Subcontractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 6,833 | 4,816 | 19,679 | 12,593
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 | 59,470 | 49,791 | 168,375 | 140,896
International | Cost-plus-fee |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
International | Fixed-price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 36,007 | 35,691 | 105,326 | 100,057
International | Time-and-materials |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | $ 23,463 | $ 14,100 | $ 63,049 | $ 40,839

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