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Revenues and Contract Balances - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | $ 1,649,416 | $ 1,485,778 | $ 3,255,175 | $ 2,976,676
Expertise |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 741,620 | 686,309 | 1,475,823 | 1,389,355
Technology |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 907,796 | 799,469 | 1,779,352 | 1,587,321
Prime contractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 1,460,839 | 1,335,846 | 2,911,149 | 2,677,405
Subcontractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 188,577 | 149,932 | 344,026 | 299,271
Department of Defense |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 1,160,060 | 1,037,014 | 2,255,380 | 2,037,141
Federal civilian agencies |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 399,768 | 371,897 | 823,855 | 785,561
Commercial and other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 89,588 | 76,867 | 175,940 | 153,974
Cost-plus-fee |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 953,344 | 889,358 | 1,888,090 | 1,783,071
Fixed-price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 509,356 | 433,290 | 991,129 | 840,995
Time and materials |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 186,716 | 163,130 | 375,956 | 352,610
Domestic |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 1,605,175 | 1,438,250 | 3,164,070 | 2,881,972
Domestic | Expertise |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 725,503 | 668,209 | 1,443,153 | 1,351,833
Domestic | Technology |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 879,672 | 770,041 | 1,720,917 | 1,530,139
Domestic | Prime contractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 1,420,367 | 1,292,529 | 2,827,821 | 2,591,182
Domestic | Subcontractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 184,808 | 145,721 | 336,249 | 290,790
Domestic | Department of Defense |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 1,160,060 | 1,037,014 | 2,255,380 | 2,037,141
Domestic | Federal civilian agencies |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 399,768 | 371,897 | 823,855 | 785,561
Domestic | Commercial and other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 45,347 | 29,339 | 84,835 | 59,270
Domestic | Cost-plus-fee |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 953,344 | 889,358 | 1,888,090 | 1,783,071
Domestic | Fixed-price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 478,201 | 400,011 | 926,763 | 774,485
Domestic | Time and materials |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 173,630 | 148,881 | 349,217 | 324,416
International |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 44,241 | 47,528 | 91,105 | 94,704
International | Expertise |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 16,117 | 18,100 | 32,670 | 37,522
International | Technology |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 28,124 | 29,428 | 58,435 | 57,182
International | Prime contractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 40,472 | 43,317 | 83,328 | 86,223
International | Subcontractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 3,769 | 4,211 | 7,777 | 8,481
International | Commercial and other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 44,241 | 47,528 | 91,105 | 94,704
International | Fixed-price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | 31,155 | 33,279 | 64,366 | 66,510
International | Time and materials |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenues | $ 13,086 | $ 14,249 | $ 26,739 | $ 28,194

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