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Revenue Recognition - Disaggregation of Revenue by Contract Type, Customer Information and Prime or Subcontractor (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | $ 1,395,469 | $ 1,181,641 | $ 2,758,861 | $ 2,347,505
Prime contractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 1,268,993 | 1,091,956 | 2,505,246 | 2,181,828
Subcontractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 126,476 | 89,685 | 253,615 | 165,677
Department of Defense |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 990,381 | 834,797 | 1,928,021 | 1,653,063
Federal civilian agencies |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 342,029 | 287,915 | 706,022 | 580,117
Commercial and other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 63,059 | 58,929 | 124,818 | 114,325
Cost-plus-fee |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 818,477 | 657,050 | 1,566,191 | 1,298,577
Firm fixed-price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 388,867 | 337,374 | 806,843 | 681,378
Time and materials |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 188,125 | 187,217 | 385,827 | 367,550
Domestic |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 1,353,793 | 1,142,552 | 2,678,566 | 2,269,075
Domestic | Prime contractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 1,227,317 | 1,052,867 | 2,424,951 | 2,103,398
Domestic | Subcontractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 126,476 | 89,685 | 253,615 | 165,677
Domestic | Department of Defense |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 990,381 | 834,797 | 1,928,021 | 1,653,063
Domestic | Federal civilian agencies |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 342,029 | 287,915 | 706,022 | 580,117
Domestic | Commercial and other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 21,383 | 19,840 | 44,523 | 35,895
Domestic | Cost-plus-fee |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 818,477 | 657,050 | 1,566,191 | 1,298,577
Domestic | Firm fixed-price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 361,016 | 313,018 | 752,552 | 634,089
Domestic | Time and materials |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 174,300 | 172,484 | 359,823 | 336,409
International |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 41,676 | 39,089 | 80,295 | 78,430
International | Prime contractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 41,676 | 39,089 | 80,295 | 78,430
International | Commercial and other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 41,676 | 39,089 | 80,295 | 78,430
International | Firm fixed-price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 27,851 | 24,356 | 54,291 | 47,289
International | Time and materials |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | $ 13,825 | $ 14,733 | $ 26,004 | $ 31,141

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