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Revenues from Contracts with Customers - Disaggregation of Revenue (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Disaggregation Of Revenue [Line Items] |  |
Revenues | $ 1,490,898 | $ 1,459,506
Expertise |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 703,046 | 740,683
Technology |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 787,852 | 718,823
Prime contractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 1,341,559 | 1,326,838
Subcontractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 149,339 | 132,668
Department of Defense |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 1,000,127 | 1,004,195
Federal civilian agencies |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 413,664 | 390,179
Commercial and other |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 77,107 | 65,132
Cost-plus-fee |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 893,713 | 823,609
Fixed-price |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 407,705 | 433,814
Time and materials |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 189,480 | 202,083
Domestic |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 1,443,722 | 1,418,187
Domestic | Expertise |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 683,624 | 723,197
Domestic | Technology |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 760,098 | 694,990
Domestic | Prime contractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 1,298,653 | 1,288,705
Domestic | Subcontractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 145,069 | 129,482
Domestic | Department of Defense |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 1,000,127 | 1,004,195
Domestic | Federal civilian agencies |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 413,664 | 390,179
Domestic | Commercial and other |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 29,931 | 23,813
Domestic | Cost-plus-fee |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 893,713 | 823,609
Domestic | Fixed-price |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 374,474 | 409,584
Domestic | Time and materials |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 175,535 | 184,994
International |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 47,176 | 41,319
International | Expertise |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 19,422 | 17,486
International | Technology |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 27,754 | 23,833
International | Prime contractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 42,906 | 38,133
International | Subcontractor |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 4,270 | 3,186
International | Commercial and other |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 47,176 | 41,319
International | Fixed-price |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | 33,231 | 24,230
International | Time and materials |  |
Disaggregation Of Revenue [Line Items] |  |
Revenues | $ 13,945 | $ 17,089

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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=123359005&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=123359005&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=123359005&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=123359005&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=123359005&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=123351226&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=123359005&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=123359005&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=123359005&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=123351226&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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