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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, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | $ 1,181,641 | $ 1,087,860 | $ 2,347,505 | $ 2,173,674
Prime contractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 1,091,956 |  | 2,181,828 |
Subcontractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 89,685 |  | 165,677 |
Department of Defense |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 834,797 |  | 1,653,063 |
Federal civilian agencies |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 287,915 |  | 580,117 |
Commercial and other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 58,929 |  | 114,325 |
Domestic |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 1,142,552 | 1,046,823 | 2,269,075 | 2,097,706
Domestic | Prime contractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 1,052,867 |  | 2,103,398 |
Domestic | Subcontractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 89,685 |  | 165,677 |
Domestic | Department of Defense |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 834,797 |  | 1,653,063 |
Domestic | Federal civilian agencies |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 287,915 |  | 580,117 |
Domestic | Commercial and other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 19,840 |  | 35,895 |
International |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 39,089 | $ 41,037 | 78,430 | $ 75,968
International | Prime contractor |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 39,089 |  | 78,430 |
International | Commercial and other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 39,089 |  | 78,430 |
Cost-plus-fee |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 657,050 |  | 1,298,577 |
Cost-plus-fee | Domestic |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 657,050 |  | 1,298,577 |
Firm fixed-price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 337,374 |  | 681,378 |
Firm fixed-price | Domestic |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 313,018 |  | 634,089 |
Firm fixed-price | International |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 24,356 |  | 47,289 |
Time and materials |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 187,217 |  | 367,550 |
Time and materials | Domestic |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 172,484 |  | 336,409 |
Time and materials | International |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | $ 14,733 |  | $ 31,141 |

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