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Revenues and Contract Balances - Disaggregation of Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Disaggregation Of Revenue [Line Items] |  |
Revenues | $ 1,850,147 | $ 1,605,759
Expertise |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 878,094 | 734,203
Technology |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 972,053 | 871,556
Prime contractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 1,649,362 | 1,450,310
Subcontractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 200,785 | 155,449
Department of Defense |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 1,352,306 | 1,095,320
Federal civilian agencies |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 407,344 | 424,087
Commercial and other |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 90,497 | 86,352
Cost-plus-fee |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 1,134,435 | 934,746
Fixed-price |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 502,077 | 481,773
Time-and-materials |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 213,635 | 189,240
Domestic |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 1,795,168 | 1,558,895
Domestic | Expertise |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 857,196 | 717,650
Domestic | Technology |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 937,972 | 841,245
Domestic | Prime contractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 1,601,091 | 1,407,454
Domestic | Subcontractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 194,077 | 151,441
Domestic | Department of Defense |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 1,352,306 | 1,095,320
Domestic | Federal civilian agencies |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 407,344 | 424,087
Domestic | Commercial and other |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 35,518 | 39,488
Domestic | Cost-plus-fee |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 1,134,435 | 934,746
Domestic | Fixed-price |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 467,216 | 448,562
Domestic | Time-and-materials |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 193,517 | 175,587
International |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 54,979 | 46,864
International | Expertise |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 20,898 | 16,553
International | Technology |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 34,081 | 30,311
International | Prime contractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 48,271 | 42,856
International | Subcontractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 6,708 | 4,008
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 | 54,979 | 46,864
International | Cost-plus-fee |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 0 | 0
International | Fixed-price |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 34,861 | 33,211
International | Time-and-materials |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | $ 20,118 | $ 13,653

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