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Revenue Recognition - Disaggregation of Revenue (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | $ 1,551,918 | $ 1,465,600 | $ 4,480,135 | $ 4,224,461
Expertise |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 764,419 | 763,336 | 2,237,378 | 2,227,723
Technology |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 787,499 | 702,264 | 2,242,757 | 1,996,738
Prime contractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 1,401,633 | 1,340,861 | 4,055,496 | 3,842,621
Subcontractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 150,285 | 124,739 | 424,639 | 381,840
Department of Defense |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 1,074,056 | 1,037,242 | 3,091,126 | 2,965,263
Federal civilian agencies |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 405,855 | 361,320 | 1,186,068 | 1,067,342
Commercial and other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 72,007 | 67,038 | 202,941 | 191,856
Cost-plus-fee |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 905,774 | 852,700 | 2,572,967 | 2,418,891
Fixed-price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 457,099 | 405,736 | 1,331,734 | 1,212,579
Time and materials |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 189,045 | 207,164 | 575,434 | 592,991
Domestic |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 1,505,037 | 1,419,358 | 4,350,284 | 4,097,924
Domestic | Expertise |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 745,440 | 744,997 | 2,184,449 | 2,180,498
Domestic | Technology |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 759,597 | 674,361 | 2,165,835 | 1,917,426
Domestic | Prime contractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 1,358,423 | 1,298,073 | 3,935,661 | 3,723,024
Domestic | Subcontractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 146,614 | 121,285 | 414,623 | 374,900
Domestic | Department of Defense |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 1,074,056 | 1,037,242 | 3,091,126 | 2,965,263
Domestic | Federal civilian agencies |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 405,855 | 361,320 | 1,186,068 | 1,067,342
Domestic | Commercial and other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 25,126 | 20,796 | 73,090 | 65,319
Domestic | Cost-plus-fee |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 905,774 | 852,700 | 2,572,967 | 2,418,891
Domestic | Fixed-price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 424,580 | 376,314 | 1,245,278 | 1,128,866
Domestic | Time and materials |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 174,683 | 190,344 | 532,039 | 550,167
International |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 46,881 | 46,242 | 129,851 | 126,537
International | Expertise |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 18,979 | 18,339 | 52,929 | 47,225
International | Technology |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 27,902 | 27,903 | 76,922 | 79,312
International | Prime contractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 43,210 | 42,788 | 119,835 | 119,597
International | Subcontractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 3,671 | 3,454 | 10,016 | 6,940
International | Commercial and other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 46,881 | 46,242 | 129,851 | 126,537
International | Fixed-price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 32,519 | 29,422 | 86,456 | 83,713
International | Time and materials |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | $ 14,362 | $ 16,820 | $ 43,395 | $ 42,824

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