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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, 2020 | Sep. 30, 2019
Disaggregation Of Revenue [Line Items] |  |
Revenue | $ 1,459,506 | $ 1,363,392
Expertise |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 740,683 | 722,353
Technology |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 718,823 | 641,039
Prime contractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 1,326,838 | 1,235,105
Subcontractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 132,668 | 128,287
Department of Defense |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 1,004,195 | 937,640
Federal civilian agencies |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 390,179 | 363,993
Commercial and other |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 65,132 | 61,759
Cost-plus-fee |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 823,609 | 747,714
Fixed-price |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 433,814 | 417,976
Time and materials |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 202,083 | 197,702
Domestic |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 1,418,187 | 1,324,773
Domestic | Expertise |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 723,197 | 709,025
Domestic | Technology |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 694,990 | 615,748
Domestic | Prime contractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 1,288,705 | 1,197,634
Domestic | Subcontractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 129,482 | 127,139
Domestic | Department of Defense |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 1,004,195 | 937,640
Domestic | Federal civilian agencies |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 390,179 | 363,993
Domestic | Commercial and other |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 23,813 | 23,140
Domestic | Cost-plus-fee |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 823,609 | 747,714
Domestic | Fixed-price |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 409,584 | 391,536
Domestic | Time and materials |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 184,994 | 185,523
International |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 41,319 | 38,619
International | Expertise |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 17,486 | 13,328
International | Technology |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 23,833 | 25,291
International | Prime contractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 38,133 | 37,471
International | Subcontractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 3,186 | 1,148
International | Commercial and other |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 41,319 | 38,619
International | Fixed-price |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 24,230 | 26,440
International | Time and materials |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | $ 17,089 | $ 12,179

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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