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Revenue Recognition - Disaggregation of Revenue (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | $ 1,468,711 | $ 1,395,469 | $ 2,928,217 | $ 2,758,861
Expertise |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 732,276 | 742,034 | 1,472,959 | 1,464,387
Technology |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 736,435 | 653,435 | 1,455,258 | 1,294,474
Prime contractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 1,327,025 | 1,266,655 | 2,653,863 | 2,501,760
Subcontractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 141,686 | 128,814 | 274,354 | 257,101
Department of Defense |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 1,012,875 | 990,381 | 2,017,070 | 1,928,021
Federal civilian agencies |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 390,034 | 342,029 | 780,213 | 706,022
Commercial and other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 65,802 | 63,059 | 130,934 | 124,818
Cost-plus-fee |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 843,584 | 818,477 | 1,667,193 | 1,566,191
Fixed-price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 440,821 | 388,867 | 874,635 | 806,843
Time and materials |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 184,306 | 188,125 | 386,389 | 385,827
Domestic |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 1,427,060 | 1,353,793 | 2,845,247 | 2,678,566
Domestic | Expertise |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 715,812 | 726,476 | 1,439,009 | 1,435,501
Domestic | Technology |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 711,248 | 627,317 | 1,406,238 | 1,243,065
Domestic | Prime contractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 1,288,533 | 1,227,317 | 2,577,238 | 2,424,951
Domestic | Subcontractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 138,527 | 126,476 | 268,009 | 253,615
Domestic | Department of Defense |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 1,012,875 | 990,381 | 2,017,070 | 1,928,021
Domestic | Federal civilian agencies |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 390,034 | 342,029 | 780,213 | 706,022
Domestic | Commercial and other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 24,151 | 21,383 | 47,964 | 44,523
Domestic | Cost-plus-fee |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 843,584 | 818,477 | 1,667,193 | 1,566,191
Domestic | Fixed-price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 411,114 | 361,016 | 820,698 | 752,552
Domestic | Time and materials |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 172,362 | 174,300 | 357,356 | 359,823
International |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 41,651 | 41,676 | 82,970 | 80,295
International | Expertise |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 16,464 | 15,558 | 33,950 | 28,886
International | Technology |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 25,187 | 26,118 | 49,020 | 51,409
International | Prime contractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 38,492 | 39,338 | 76,625 | 76,809
International | Subcontractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 3,159 | 2,338 | 6,345 | 3,486
International | Commercial and other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 41,651 | 41,676 | 82,970 | 80,295
International | Fixed-price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 29,707 | 27,851 | 53,937 | 54,291
International | Time and materials |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | $ 11,944 | $ 13,825 | $ 29,033 | $ 26,004

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