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Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2023
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | $ 8,627,824 | $ 7,659,832 | $ 6,702,546
Expertise |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 3,849,841 | 3,556,989 | 3,091,372
Technology |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 4,777,983 | 4,102,843 | 3,611,174
Prime contractor |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 7,783,908 | 6,849,849 | 5,973,700
Subcontractor |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 843,916 | 809,983 | 728,846
DoD |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 6,507,728 | 5,695,408 | 4,817,470
Federal civilian agencies |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 1,751,973 | 1,588,262 | 1,533,295
Commercial and other |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 368,123 | 376,162 | 351,781
Cost-plus-fee |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 5,221,011 | 4,654,689 | 3,896,725
Fixed-price |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 2,271,602 | 2,091,179 | 2,023,968
Time-and-materials |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 1,135,211 | 913,964 | 781,853
Domestic |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 8,370,361 | 7,432,745 | 6,512,938
Domestic | Expertise |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 3,714,545 | 3,473,434 | 3,021,621
Domestic | Technology |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 4,655,816 | 3,959,311 | 3,491,317
Domestic | Prime contractor |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 7,553,566 | 6,649,114 | 5,801,840
Domestic | Subcontractor |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 816,795 | 783,631 | 711,098
Domestic | DoD |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 6,507,728 | 5,695,408 | 4,817,470
Domestic | Federal civilian agencies |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 1,751,973 | 1,588,262 | 1,533,295
Domestic | Commercial and other |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 110,660 | 149,075 | 162,173
Domestic | Cost-plus-fee |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 5,221,011 | 4,654,689 | 3,896,725
Domestic | Fixed-price |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 2,112,490 | 1,950,286 | 1,888,414
Domestic | Time-and-materials |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 1,036,860 | 827,770 | 727,799
International |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 257,463 | 227,087 | 189,608
International | Expertise |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 135,296 | 83,555 | 69,751
International | Technology |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 122,167 | 143,532 | 119,857
International | Prime contractor |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 230,342 | 200,735 | 171,860
International | Subcontractor |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 27,121 | 26,352 | 17,748
International | DoD |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 0 | 0 | 0
International | Federal civilian agencies |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 0 | 0 | 0
International | Commercial and other |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 257,463 | 227,087 | 189,608
International | Cost-plus-fee |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 0 | 0 | 0
International | Fixed-price |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 159,112 | 140,893 | 135,554
International | Time-and-materials |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | $ 98,351 | $ 86,194 | $ 54,054

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