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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 | 9 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | $ 1,465,600 | $ 1,264,958 | $ 4,224,461 | $ 3,612,463
Prime contractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 1,344,315 | 1,153,599 | 3,849,561 | 3,335,427
Subcontractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 121,285 | 111,359 | 374,900 | 277,036
Department of Defense |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 1,037,242 | 887,030 | 2,965,263 | 2,540,093
Federal civilian agencies |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 361,320 | 318,374 | 1,067,342 | 898,491
Commercial and other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 67,038 | 59,554 | 191,856 | 173,879
Cost-plus-fee |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 852,700 | 704,627 | 2,418,891 | 2,003,204
Firm fixed-price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 405,736 | 374,006 | 1,212,579 | 1,055,384
Time and materials |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 207,164 | 186,325 | 592,991 | 553,875
Domestic |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 1,419,358 | 1,225,531 | 4,097,924 | 3,494,606
Domestic | Prime contractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 1,298,073 | 1,114,172 | 3,723,024 | 3,217,570
Domestic | Subcontractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 121,285 | 111,359 | 374,900 | 277,036
Domestic | Department of Defense |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 1,037,242 | 887,030 | 2,965,263 | 2,540,093
Domestic | Federal civilian agencies |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 361,320 | 318,374 | 1,067,342 | 898,491
Domestic | Commercial and other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 20,796 | 20,127 | 65,319 | 56,022
Domestic | Cost-plus-fee |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 852,700 | 704,627 | 2,418,891 | 2,003,204
Domestic | Firm fixed-price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 376,314 | 348,143 | 1,128,866 | 982,232
Domestic | Time and materials |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 190,344 | 172,761 | 550,167 | 509,170
International |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 46,242 | 39,427 | 126,537 | 117,857
International | Prime contractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 46,242 | 39,427 | 126,537 | 117,857
International | Commercial and other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 46,242 | 39,427 | 126,537 | 117,857
International | Firm fixed-price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 29,422 | 25,863 | 83,713 | 73,152
International | Time and materials |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | $ 16,820 | $ 13,564 | $ 42,824 | $ 44,705

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