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Revenues - Disaggregation of Revenue (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2020
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | $ 6,202,917 | $ 6,044,135 | $ 5,720,042
Expertise |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 2,869,317 | 2,972,966 | 3,001,512
Technology |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 3,333,600 | 3,071,169 | 2,718,530
Prime contractor |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 5,564,922 | 5,449,590 | 5,211,366
Subcontractor |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 637,995 | 594,545 | 508,676
Department of Defense |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 4,331,327 | 4,185,292 | 3,999,261
Federal civilian agencies |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 1,549,791 | 1,585,672 | 1,467,801
Commercial and other |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 321,799 | 273,171 | 252,980
Cost-plus-fee |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 3,632,359 | 3,504,838 | 3,274,707
Fixed-price |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 1,823,221 | 1,769,841 | 1,629,475
Time and materials |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 747,337 | 769,456 | 815,860
Domestic |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 6,011,059 | 5,868,392 | 5,556,672
Domestic | Expertise |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 2,796,038 | 2,901,204 | 2,938,379
Domestic | Technology |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 3,215,021 | 2,967,188 | 2,618,293
Domestic | Prime contractor |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 5,389,870 | 5,284,761 | 5,057,930
Domestic | Subcontractor |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 621,189 | 583,631 | 498,742
Domestic | Department of Defense |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 4,331,327 | 4,185,292 | 3,999,261
Domestic | Federal civilian agencies |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 1,549,791 | 1,585,672 | 1,467,801
Domestic | Commercial and other |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 129,941 | 97,428 | 89,610
Domestic | Cost-plus-fee |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 3,632,359 | 3,504,838 | 3,274,707
Domestic | Fixed-price |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 1,690,480 | 1,651,343 | 1,524,381
Domestic | Time and materials |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 688,220 | 712,211 | 757,584
International |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 191,858 | 175,743 | 163,370
International | Expertise |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 73,279 | 71,762 | 63,133
International | Technology |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 118,579 | 103,981 | 100,237
International | Prime contractor |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 175,052 | 164,829 | 153,436
International | Subcontractor |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 16,806 | 10,914 | 9,934
International | Commercial and other |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 191,858 | 175,743 | 163,370
International | Fixed-price |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | 132,741 | 118,498 | 105,094
International | Time and materials |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenues | $ 59,117 | $ 57,245 | $ 58,276

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