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Revenues and Contract Balances - Disaggregation of Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Disaggregation Of Revenue [Line Items] |  |
Revenues | $ 2,056,889 | $ 1,850,147
Expertise |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 988,265 | 878,094
Technology |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 1,068,624 | 972,053
Prime contractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 1,880,419 | 1,649,362
Subcontractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 176,470 | 200,785
Department of Defense |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 1,534,533 | 1,352,306
Federal civilian agencies |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 439,371 | 407,344
Commercial and other |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 82,985 | 90,497
Cost-plus-fee |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 1,280,010 | 1,134,435
Fixed-price |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 475,256 | 502,077
Time-and-materials |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 301,623 | 213,635
Domestic |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 1,996,321 | 1,795,168
Domestic | Expertise |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 956,496 | 857,196
Domestic | Technology |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 1,039,825 | 937,972
Domestic | Prime contractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 1,826,763 | 1,601,091
Domestic | Subcontractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 169,558 | 194,077
Domestic | Department of Defense |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 1,534,533 | 1,352,306
Domestic | Federal civilian agencies |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 439,371 | 407,344
Domestic | Commercial and other |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 22,417 | 35,518
Domestic | Cost-plus-fee |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 1,280,010 | 1,134,435
Domestic | Fixed-price |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 439,240 | 467,216
Domestic | Time-and-materials |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 277,071 | 193,517
International |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 60,568 | 54,979
International | Expertise |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 31,769 | 20,898
International | Technology |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 28,799 | 34,081
International | Prime contractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 53,656 | 48,271
International | Subcontractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 6,912 | 6,708
International | Department of Defense |  |
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 | 60,568 | 54,979
International | Cost-plus-fee |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 0 | 0
International | Fixed-price |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 36,016 | 34,861
International | Time-and-materials |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | $ 24,552 | $ 20,118

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