<?xml version='1.0' encoding='UTF-8'?>
<FilingSummary>
  <Version>3.8.0.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>185</ContextCount>
  <ElementCount>358</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>72</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>9</UnitCount>
  <MyReports>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0001000 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/DocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>1001000 - Statement - Consolidated Statements of Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/ConsolidatedStatementsOfIncome</Role>
      <ShortName>Consolidated Statements of Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>1002000 - Statement - Consolidated Statements of Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/ConsolidatedStatementsOfComprehensiveIncome</Role>
      <ShortName>Consolidated Statements of Comprehensive Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>1003000 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/ConsolidatedBalanceSheets</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>1003001 - Statement - Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/ConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>1004000 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/ConsolidatedStatementsOfCashFlows</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>1005000 - Statement - Consolidated Statements of Shareholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/ConsolidatedStatementsOfShareholdersEquity</Role>
      <ShortName>Consolidated Statements of Shareholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>2101100 - Disclosure - Description of Business and Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/DescriptionOfBusinessAndSummaryOfSignificantAccountingPolicies</Role>
      <ShortName>Description of Business and Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>2102100 - Disclosure - Recent Accounting Pronouncements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/RecentAccountingPronouncements</Role>
      <ShortName>Recent Accounting Pronouncements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>2103100 - Disclosure - Adoption of ASU 606</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/AdoptionOfAsu606</Role>
      <ShortName>Adoption of ASU 606</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>2104100 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>2105100 - Disclosure - Earnings Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/EarningsPerShare</Role>
      <ShortName>Earnings Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>2106100 - Disclosure - Receivables</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/Receivables</Role>
      <ShortName>Receivables</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>2108100 - Disclosure - Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/Debt</Role>
      <ShortName>Debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>2110100 - Disclosure - Derivative Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/DerivativeInstruments</Role>
      <ShortName>Derivative Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>2111100 - Disclosure - Composition of Certain Financial Statement Captions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/CompositionOfCertainFinancialStatementCaptions</Role>
      <ShortName>Composition of Certain Financial Statement Captions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>2112100 - Disclosure - Plant, Property and Equipment, Net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/PlantPropertyAndEquipmentNet</Role>
      <ShortName>Plant, Property and Equipment, Net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>2113100 - Disclosure - Leases and Rentals</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/LeasesAndRentals</Role>
      <ShortName>Leases and Rentals</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>2114100 - Disclosure - Work Force Reduction and CEO Transition</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/WorkForceReductionAndCeoTransition</Role>
      <ShortName>Work Force Reduction and CEO Transition</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>2115100 - Disclosure - Post Employment Benefit Plans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/PostEmploymentBenefitPlans</Role>
      <ShortName>Post Employment Benefit Plans</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>2116100 - Disclosure - Stock-Based Compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/StockBasedCompensation</Role>
      <ShortName>Stock-Based Compensation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>2117100 - Disclosure - Shareholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/ShareholdersEquity</Role>
      <ShortName>Shareholders' Equity</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>2118100 - Disclosure - Agreements and Transactions with Former Parent</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/AgreementsAndTransactionsWithFormerParent</Role>
      <ShortName>Agreements and Transactions with Former Parent</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>2119100 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/CommitmentsAndContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>2119100 - Disclosure - Selected Quarterly Financial Data (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/SelectedQuarterlyFinancialDataUnaudited</Role>
      <ShortName>Selected Quarterly Financial Data (Unaudited)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>213100 - Disclosure - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/SubsequentEvents</Role>
      <ShortName>Subsequent Events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>2201201 - Disclosure - Description of Business and Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/DescriptionOfBusinessAndSummaryOfSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Description of Business and Summary of Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.vectrusinc.com/role/DescriptionOfBusinessAndSummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>2301302 - Disclosure - Description of Business and Summary of Significant Accounting Policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/DescriptionOfBusinessAndSummaryOfSignificantAccountingPoliciesTables</Role>
      <ShortName>Description of Business and Summary of Significant Accounting Policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.vectrusinc.com/role/DescriptionOfBusinessAndSummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>2302301 - Disclosure - Recent Accounting Pronouncements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/RecentAccountingPronouncementsTables</Role>
      <ShortName>Recent Accounting Pronouncements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.vectrusinc.com/role/RecentAccountingPronouncements</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>2303301 - Disclosure - Adoption of ASU 606 (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/AdoptionOfAsu606Tables</Role>
      <ShortName>Adoption of ASU 606 (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.vectrusinc.com/role/AdoptionOfAsu606</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>2304301 - Disclosure - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/IncomeTaxesTables</Role>
      <ShortName>Income Taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.vectrusinc.com/role/IncomeTaxes</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>2305301 - Disclosure - Earnings Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/EarningsPerShareTables</Role>
      <ShortName>Earnings Per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.vectrusinc.com/role/EarningsPerShare</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>2306301 - Disclosure - Receivables (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/ReceivablesTables</Role>
      <ShortName>Receivables (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.vectrusinc.com/role/Receivables</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>2308301 - Disclosure - Debt (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/DebtTables</Role>
      <ShortName>Debt (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.vectrusinc.com/role/Debt</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>2310301 - Disclosure - Derivative Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/DerivativeInstrumentsTables</Role>
      <ShortName>Derivative Instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.vectrusinc.com/role/DerivativeInstruments</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>2311301 - Disclosure - Composition of Certain Financial Statement Captions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/CompositionOfCertainFinancialStatementCaptionsTables</Role>
      <ShortName>Composition of Certain Financial Statement Captions (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.vectrusinc.com/role/CompositionOfCertainFinancialStatementCaptions</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>2312301 - Disclosure - Plant, Property and Equipment, Net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/PlantPropertyAndEquipmentNetTables</Role>
      <ShortName>Plant, Property and Equipment, Net (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.vectrusinc.com/role/PlantPropertyAndEquipmentNet</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>2313301 - Disclosure - Leases and Rentals (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/LeasesAndRentalsTables</Role>
      <ShortName>Leases and Rentals (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.vectrusinc.com/role/LeasesAndRentals</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>2314301 - Disclosure - Work Force Reduction and CEO Transition (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/WorkForceReductionAndCeoTransitionTables</Role>
      <ShortName>Work Force Reduction and CEO Transition (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.vectrusinc.com/role/WorkForceReductionAndCeoTransition</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>2316301 - Disclosure - Stock-Based Compensation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/StockBasedCompensationTables</Role>
      <ShortName>Stock-Based Compensation (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.vectrusinc.com/role/StockBasedCompensation</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>2319301 - Disclosure - Selected Quarterly Financial Data (Unaudited) (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/SelectedQuarterlyFinancialDataUnauditedTables</Role>
      <ShortName>Selected Quarterly Financial Data (Unaudited) (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.vectrusinc.com/role/SelectedQuarterlyFinancialDataUnaudited</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>2401403 - Disclosure - Description of Business and Summary of Significant Accounting Policies - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/DescriptionOfBusinessAndSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails</Role>
      <ShortName>Description of Business and Summary of Significant Accounting Policies - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>2401404 - Disclosure - Description of Business and Summary of Significant Accounting Policies - Summary of Cumulative Catch-Up Adjustments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/DescriptionOfBusinessAndSummaryOfSignificantAccountingPoliciesSummaryOfCumulativeCatchUpAdjustmentsDetails</Role>
      <ShortName>Description of Business and Summary of Significant Accounting Policies - Summary of Cumulative Catch-Up Adjustments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>2402402 - Disclosure - Recent Accounting Pronouncements Recent Accounting Pronouncements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/RecentAccountingPronouncementsRecentAccountingPronouncementsDetails</Role>
      <ShortName>Recent Accounting Pronouncements Recent Accounting Pronouncements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>2403402 - Disclosure - Adoption of ASU 606 - Effects of the Adoption of ASU Topic 606 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/AdoptionOfAsu606EffectsOfAdoptionOfAsuTopic606Details</Role>
      <ShortName>Adoption of ASU 606 - Effects of the Adoption of ASU Topic 606 (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>2404402 - Disclosure - Income Taxes - Schedule of Components of Income Tax Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/IncomeTaxesScheduleOfComponentsOfIncomeTaxExpenseDetails</Role>
      <ShortName>Income Taxes - Schedule of Components of Income Tax Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>2404403 - Disclosure - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/IncomeTaxesScheduleOfEffectiveIncomeTaxRateReconciliationDetails</Role>
      <ShortName>Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>2404404 - Disclosure - Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/IncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails</Role>
      <ShortName>Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>2404405 - Disclosure - Income Taxes - Classification of Deferred Taxes on the Consolidated and Combined Balance Sheets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/IncomeTaxesClassificationOfDeferredTaxesOnConsolidatedAndCombinedBalanceSheetsDetails</Role>
      <ShortName>Income Taxes - Classification of Deferred Taxes on the Consolidated and Combined Balance Sheets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>2404406 - Disclosure - Income Taxes - Schedule of Unrecognized Tax Benefits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/IncomeTaxesScheduleOfUnrecognizedTaxBenefitsDetails</Role>
      <ShortName>Income Taxes - Schedule of Unrecognized Tax Benefits (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>2404407 - Disclosure - Income Taxes - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/IncomeTaxesNarrativeDetails</Role>
      <ShortName>Income Taxes - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>2405402 - Disclosure - Earnings Per Share - Reconciliation of Basic and Diluted Weighted Average Shares Outstanding (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/EarningsPerShareReconciliationOfBasicAndDilutedWeightedAverageSharesOutstandingDetails</Role>
      <ShortName>Earnings Per Share - Reconciliation of Basic and Diluted Weighted Average Shares Outstanding (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>2405403 - Disclosure - Earnings Per Share Earnings Per Share - Anti-dilutive Options (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/EarningsPerShareEarningsPerShareAntiDilutiveOptionsDetails</Role>
      <ShortName>Earnings Per Share Earnings Per Share - Anti-dilutive Options (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>2406402 - Disclosure - Receivables - Schedule of Receivables (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/ReceivablesScheduleOfReceivablesDetails</Role>
      <ShortName>Receivables - Schedule of Receivables (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>2408402 - Disclosure - Debt - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/DebtAdditionalInformationDetails</Role>
      <ShortName>Debt - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>2408403 - Disclosure - Debt - Schedule of Maturities of Term Facility (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/DebtScheduleOfMaturitiesOfTermFacilityDetails</Role>
      <ShortName>Debt - Schedule of Maturities of Term Facility (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>2408404 - Disclosure - Debt - Schedule of Carrying Values and Fair Values of Term Facility (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/DebtScheduleOfCarryingValuesAndFairValuesOfTermFacilityDetails</Role>
      <ShortName>Debt - Schedule of Carrying Values and Fair Values of Term Facility (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>2410402 - Disclosure - Derivative Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/DerivativeInstrumentsDetails</Role>
      <ShortName>Derivative Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.vectrusinc.com/role/DerivativeInstrumentsTables</ParentRole>
      <Position>58</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>2411402 - Disclosure - Composition of Certain Financial Statement Captions - Schedule of Compensation and Other Employee Benefits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/CompositionOfCertainFinancialStatementCaptionsScheduleOfCompensationAndOtherEmployeeBenefitsDetails</Role>
      <ShortName>Composition of Certain Financial Statement Captions - Schedule of Compensation and Other Employee Benefits (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>2411403 - Disclosure - Composition of Certain Financial Statement Captions - Schedule of Other Accrued Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/CompositionOfCertainFinancialStatementCaptionsScheduleOfOtherAccruedLiabilitiesDetails</Role>
      <ShortName>Composition of Certain Financial Statement Captions - Schedule of Other Accrued Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>2412402 - Disclosure - Plant, Property and Equipment, Net - Plant, Property and Equipment, Net (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/PlantPropertyAndEquipmentNetPlantPropertyAndEquipmentNetDetails</Role>
      <ShortName>Plant, Property and Equipment, Net - Plant, Property and Equipment, Net (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>2412403 - Disclosure - Plant, Property and Equipment, Net - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/PlantPropertyAndEquipmentNetAdditionalInformationDetails</Role>
      <ShortName>Plant, Property and Equipment, Net - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>2413402 - Disclosure - Leases and Rentals - Schedule of Future Operating Lease Payments Under Non-Cancellable Operating Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/LeasesAndRentalsScheduleOfFutureOperatingLeasePaymentsUnderNonCancellableOperatingLeasesDetails</Role>
      <ShortName>Leases and Rentals - Schedule of Future Operating Lease Payments Under Non-Cancellable Operating Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>2413403 - Disclosure - Leases and Rentals - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/LeasesAndRentalsAdditionalInformationDetails</Role>
      <ShortName>Leases and Rentals - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>2413404 - Disclosure - Leases and Rentals - Schedule of Future Minimum Lease Payments for Capital Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/LeasesAndRentalsScheduleOfFutureMinimumLeasePaymentsForCapitalLeasesDetails</Role>
      <ShortName>Leases and Rentals - Schedule of Future Minimum Lease Payments for Capital Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>2413405 - Disclosure - Leases and Rentals - Schedule of Capital Leases Included in Plant, Property and Equipment, Net (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/LeasesAndRentalsScheduleOfCapitalLeasesIncludedInPlantPropertyAndEquipmentNetDetails</Role>
      <ShortName>Leases and Rentals - Schedule of Capital Leases Included in Plant, Property and Equipment, Net (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>2413406 - Disclosure - Leases and Rentals - Schedule of Capital Lease Obligations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/LeasesAndRentalsScheduleOfCapitalLeaseObligationsDetails</Role>
      <ShortName>Leases and Rentals - Schedule of Capital Lease Obligations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>2414402 - Disclosure - Work Force Reduction and CEO Transition - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/WorkForceReductionAndCeoTransitionAdditionalInformationDetails</Role>
      <ShortName>Work Force Reduction and CEO Transition - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>2415401 - Disclosure - Post Employment Benefit Plans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/PostEmploymentBenefitPlansDetails</Role>
      <ShortName>Post Employment Benefit Plans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.vectrusinc.com/role/PostEmploymentBenefitPlans</ParentRole>
      <Position>69</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>2416402 - Disclosure - Stock-Based Compensation - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/StockBasedCompensationAdditionalInformationDetails</Role>
      <ShortName>Stock-Based Compensation - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>2416403 - Disclosure - Stock-Based Compensation - Schedule of Impact of Stock-Based Compensation in Consolidated and Combined Statements of Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/StockBasedCompensationScheduleOfImpactOfStockBasedCompensationInConsolidatedAndCombinedStatementsOfIncomeDetails</Role>
      <ShortName>Stock-Based Compensation - Schedule of Impact of Stock-Based Compensation in Consolidated and Combined Statements of Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>2416404 - Disclosure - Stock-Based Compensation - Schedule of Non-Qualified Stock Options, Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/StockBasedCompensationScheduleOfNonQualifiedStockOptionsActivityDetails</Role>
      <ShortName>Stock-Based Compensation - Schedule of Non-Qualified Stock Options, Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>2416405 - Disclosure - Stock-Based Compensation - Schedule of Non-Qualified Stock Options Outstanding and Exercisable (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/StockBasedCompensationScheduleOfNonQualifiedStockOptionsOutstandingAndExercisableDetails</Role>
      <ShortName>Stock-Based Compensation - Schedule of Non-Qualified Stock Options Outstanding and Exercisable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>2416406 - Disclosure - Stock-Based Compensation - Schedule of Weighted Average Assumptions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/StockBasedCompensationScheduleOfWeightedAverageAssumptionsDetails</Role>
      <ShortName>Stock-Based Compensation - Schedule of Weighted Average Assumptions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>2416407 - Disclosure - Stock-Based Compensation - Schedule of Restricted Stock Units, Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/StockBasedCompensationScheduleOfRestrictedStockUnitsActivityDetails</Role>
      <ShortName>Stock-Based Compensation - Schedule of Restricted Stock Units, Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>2417401 - Disclosure - Shareholders' Equity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/ShareholdersEquityDetails</Role>
      <ShortName>Shareholders' Equity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.vectrusinc.com/role/ShareholdersEquity</ParentRole>
      <Position>76</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>2419401 - Disclosure - Commitments and Contingencies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/CommitmentsAndContingenciesDetails</Role>
      <ShortName>Commitments and Contingencies (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.vectrusinc.com/role/CommitmentsAndContingencies</ParentRole>
      <Position>77</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>2419402 - Disclosure - Selected Quarterly Financial Data (Unaudited) - Schedule of Quarterly Financial Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/SelectedQuarterlyFinancialDataUnauditedScheduleOfQuarterlyFinancialInformationDetails</Role>
      <ShortName>Selected Quarterly Financial Data (Unaudited) - Schedule of Quarterly Financial Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.vectrusinc.com/role/SelectedQuarterlyFinancialDataUnauditedTables</ParentRole>
      <Position>78</Position>
    </Report>
    <Report instance="vec-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>243401 - Disclosure - Subsequent Events - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.vectrusinc.com/role/SubsequentEventsAdditionalInformationDetails</Role>
      <ShortName>Subsequent Events - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>vec-20171231.xml</File>
    <File>vec-20171231.xsd</File>
    <File>vec-20171231_cal.xml</File>
    <File>vec-20171231_def.xml</File>
    <File>vec-20171231_lab.xml</File>
    <File>vec-20171231_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy>http://fasb.org/us-gaap/2017-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/invest/2013-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/dei/2014-01-31</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
