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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
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Sep. 30, 2018 | Sep. 30, 2017
Disaggregation Of Revenue [Line Items] |  |
Revenue | $ 1,165,864 | $ 1,085,814
Prime contractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 1,089,872 |
Subcontractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 75,992 |
Department of Defense |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 818,266 |
Federal civilian agencies |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 292,202 |
Commercial and other |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 55,396 |
Domestic |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 1,126,523 | 1,050,883
Domestic | Prime contractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 1,050,531 |
Domestic | Subcontractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 75,992 |
Domestic | Department of Defense |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 818,266 |
Domestic | Federal civilian agencies |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 292,202 |
Domestic | Commercial and other |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 16,055 |
International |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 39,341 | $ 34,931
International | Prime contractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 39,341 |
International | Commercial and other |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 39,341 |
Cost-plus-fee |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 641,527 |
Cost-plus-fee | Domestic |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 641,527 |
Firm fixed-price |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 344,004 |
Firm fixed-price | Domestic |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 321,071 |
Firm fixed-price | International |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 22,933 |
Time and materials |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 180,333 |
Time and materials | Domestic |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 163,925 |
Time and materials | International |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | $ 16,408 |

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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