<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.19.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>202</ContextCount>
  <ElementCount>196</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>73</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>9</UnitCount>
  <MyReports>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>001 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/DocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>002 - Statement - Consolidated Interim Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/BalanceSheet</Role>
      <ShortName>Consolidated Interim Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>003 - Statement - Condensed Interim Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/BalanceSheetParenthetical</Role>
      <ShortName>Condensed Interim Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>004 - Statement - Consolidated Interim Consolidated Statements of Operations and Comprehensive loss (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/ConsolidatedInterimConsolidatedStatementsOfOperationsAndComprehensiveLossUnaudited</Role>
      <ShortName>Consolidated Interim Consolidated Statements of Operations and Comprehensive loss (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>005 - Statement - Condensed Interim Consolidated Statements of Cash Flows (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/CondensedInterimConsolidatedStatementsOfCashFlowsUnaudited</Role>
      <ShortName>Condensed Interim Consolidated Statements of Cash Flows (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>006 - Statement - Condensed Interim Consolidated Statement of Changes in Stockholders Equity (Deficiency) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/CondensedInterimConsolidatedStatementOfChangesInStockholdersEquityDeficiencyUnaudited</Role>
      <ShortName>Condensed Interim Consolidated Statement of Changes in Stockholders Equity (Deficiency) (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>007 - Disclosure - BASIS OF PRESENTATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/NotesToFinancialStatementsBasisOfAccountingTextBlock</Role>
      <ShortName>BASIS OF PRESENTATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>008 - Disclosure - NATURE OF OPERATIONS AND GOING CONCERN</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/NotesToFinancialStatementsNatureOfOperationsTextBlock</Role>
      <ShortName>NATURE OF OPERATIONS AND GOING CONCERN</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>009 - Disclosure - PROPERTY AND EQUIPMENT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/NotesToFinancialStatementsPropertyPlantAndEquipmentDisclosureTextBlock</Role>
      <ShortName>PROPERTY AND EQUIPMENT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>010 - Disclosure - CAPITAL STOCK</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/NotesToFinancialStatementsStockholdersEquityNoteDisclosureTextBlock</Role>
      <ShortName>CAPITAL STOCK</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>011 - Disclosure - STOCK BASED COMPENSATION AND WARRANTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/NotesToFinancialStatementsShareholdersEquityAndShareBasedPaymentsTextBlock</Role>
      <ShortName>STOCK BASED COMPENSATION AND WARRANTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>013 - Disclosure - RELATED PARTY TRANSACTIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/NotesToFinancialStatementsRelatedPartyTransactionsDisclosureTextBlock</Role>
      <ShortName>RELATED PARTY TRANSACTIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>015 - Disclosure - COMMITMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/NotesToFinancialStatementsCommitmentsDisclosureTextBlock</Role>
      <ShortName>COMMITMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>016 - Disclosure - EXCLUSIVE SUPPLY AND PURCHASE AGREEMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/EXCLUSIVESUPPLYANDPURCHASEAGREEMENTS</Role>
      <ShortName>EXCLUSIVE SUPPLY AND PURCHASE AGREEMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>017 - Disclosure - CONVERTIBLE DEBENTURES AND DEFERRED FINANCING COSTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/NotesToFinancialStatementsDebtDisclosureTextBlock</Role>
      <ShortName>CONVERTIBLE DEBENTURES AND DEFERRED FINANCING COSTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>018 - Disclosure - INVENTORY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/NotesToFinancialStatementsInventoryDisclosureTextBlock</Role>
      <ShortName>INVENTORY</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>019 - Disclosure - SEGMENT DISCLOSURES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/NotesToFinancialStatementsSegmentReportingDisclosureTextBlock</Role>
      <ShortName>SEGMENT DISCLOSURES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>020 - Disclosure - PATENT RIGHTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/PatentRights</Role>
      <ShortName>PATENT RIGHTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>021 - Disclosure - PREPAID EXPENSES AND OTHER RECEIVABLES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/PrepaidExpensesAndOtherReceivables</Role>
      <ShortName>PREPAID EXPENSES AND OTHER RECEIVABLES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>023 - Disclosure - SUBSEQUENT EVENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/NotesToFinancialStatementsSubsequentEventsTextBlock</Role>
      <ShortName>SUBSEQUENT EVENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>025 - Disclosure - PROPERTY AND EQUIPMENT (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/NotesToFinancialStatementsPropertyPlantAndEquipmentDisclosureTextBlockTables</Role>
      <ShortName>PROPERTY AND EQUIPMENT (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.securitydevicesinternational.com/role/NotesToFinancialStatementsPropertyPlantAndEquipmentDisclosureTextBlock</ParentRole>
      <Position>21</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>026 - Disclosure - STOCK BASED COMPENSATION AND WARRANTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/NotesToFinancialStatementsShareholdersEquityAndShareBasedPaymentsTextBlockTables</Role>
      <ShortName>STOCK BASED COMPENSATION AND WARRANTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.securitydevicesinternational.com/role/NotesToFinancialStatementsShareholdersEquityAndShareBasedPaymentsTextBlock</ParentRole>
      <Position>22</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>027 - Disclosure - CONVERTIBLE DEBENTURES AND DEFERRED FINANCING COSTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/NotesToFinancialStatementsDebtDisclosureTextBlockTables</Role>
      <ShortName>CONVERTIBLE DEBENTURES AND DEFERRED FINANCING COSTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.securitydevicesinternational.com/role/NotesToFinancialStatementsDebtDisclosureTextBlock</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>028 - Disclosure - SEGMENT DISCLOSURES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/NotesToFinancialStatementsSegmentReportingDisclosureTextBlockTables</Role>
      <ShortName>SEGMENT DISCLOSURES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.securitydevicesinternational.com/role/NotesToFinancialStatementsSegmentReportingDisclosureTextBlock</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>029 - Disclosure - NATURE OF OPERATIONS AND GOING CONCERN (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/DisclosureNatureOfOperationsDetails</Role>
      <ShortName>NATURE OF OPERATIONS AND GOING CONCERN (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.securitydevicesinternational.com/role/NotesToFinancialStatementsNatureOfOperationsTextBlock</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>030 - Disclosure - PROPERTY AND EQUIPMENT (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/DisclosurePropertyPlantAndEquipmentDisclosureTextBlockDetails</Role>
      <ShortName>PROPERTY AND EQUIPMENT (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.securitydevicesinternational.com/role/NotesToFinancialStatementsPropertyPlantAndEquipmentDisclosureTextBlockTables</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>031 - Disclosure - CAPITAL STOCK (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/DisclosureStockholdersEquityNoteDisclosureTextBlockDetails</Role>
      <ShortName>CAPITAL STOCK (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.securitydevicesinternational.com/role/NotesToFinancialStatementsStockholdersEquityNoteDisclosureTextBlock</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>032 - Disclosure - STOCK BASED COMPENSATION AND WARRANTS (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/DisclosureShareholdersEquityAndShareBasedPaymentsTextBlockDetails</Role>
      <ShortName>STOCK BASED COMPENSATION AND WARRANTS (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.securitydevicesinternational.com/role/NotesToFinancialStatementsShareholdersEquityAndShareBasedPaymentsTextBlockTables</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>033 - Disclosure - RELATED PARTY TRANSACTIONS (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/DisclosureRelatedPartyTransactionsDisclosureTextBlockDetails</Role>
      <ShortName>RELATED PARTY TRANSACTIONS (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.securitydevicesinternational.com/role/NotesToFinancialStatementsRelatedPartyTransactionsDisclosureTextBlock</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>034 - Disclosure - COMMITMENTS (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/DisclosureCommitmentsDisclosureTextBlockDetails</Role>
      <ShortName>COMMITMENTS (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.securitydevicesinternational.com/role/NotesToFinancialStatementsCommitmentsDisclosureTextBlock</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>035 - Disclosure - EXCLUSIVE SUPPLY AND PURCHASE AGREEMENTS (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/EXCLUSIVESUPPLYANDPURCHASEAGREEMENTSNarrativeDetails</Role>
      <ShortName>EXCLUSIVE SUPPLY AND PURCHASE AGREEMENTS (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.securitydevicesinternational.com/role/EXCLUSIVESUPPLYANDPURCHASEAGREEMENTS</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>036 - Disclosure - CONVERTIBLE DEBENTURES AND DEFERRED FINANCING COSTS (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/Disclosuredebtdisclosuretextblockdetails</Role>
      <ShortName>CONVERTIBLE DEBENTURES AND DEFERRED FINANCING COSTS (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.securitydevicesinternational.com/role/NotesToFinancialStatementsDebtDisclosureTextBlockTables</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>037 - Disclosure - INVENTORY (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/DisclosureInventoryDisclosureTextBlockDetails</Role>
      <ShortName>INVENTORY (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.securitydevicesinternational.com/role/NotesToFinancialStatementsInventoryDisclosureTextBlock</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>038 - Disclosure - SEGMENT DISCLOSURES (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/SegmentDisclosuresNarrativeDetails</Role>
      <ShortName>SEGMENT DISCLOSURES (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.securitydevicesinternational.com/role/NotesToFinancialStatementsSegmentReportingDisclosureTextBlockTables</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>039 - Disclosure - PATENTS (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/DisclosureIntangibleAssetsDisclosureTextBlockDetails</Role>
      <ShortName>PATENTS (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.securitydevicesinternational.com/role/PatentRights</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>040 - Disclosure - PREPAID EXPENSES AND OTHER RECEIVABLES (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/PrepaidExpensesAndOtherReceivablesNarrativeDetails</Role>
      <ShortName>PREPAID EXPENSES AND OTHER RECEIVABLES (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.securitydevicesinternational.com/role/PrepaidExpensesAndOtherReceivables</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>041 - Disclosure - SUBSEQUENT EVENTS (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/SubsequentEventsNarrativeDetails</Role>
      <ShortName>SUBSEQUENT EVENTS (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.securitydevicesinternational.com/role/NotesToFinancialStatementsSubsequentEventsTextBlock</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>042 - Disclosure - Schedule of Depreciation Rate, Plant and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/DisclosureScheduleOfDepreciationRatePlantAndEquipmentTableTextBlockDetails</Role>
      <ShortName>Schedule of Depreciation Rate, Plant and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>043 - Disclosure - Schedule of Property, Plant and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/DisclosurePropertyPlantAndEquipmentTextBlockDetails</Role>
      <ShortName>Schedule of Property, Plant and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>044 - Disclosure - Schedule of Share-based Payment Award, Warrants, Valuation Assumptions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/DisclosureScheduleOfSharebasedPaymentAwardWarrantsValuationAssumptionsTableTextBlockDetails</Role>
      <ShortName>Schedule of Share-based Payment Award, Warrants, Valuation Assumptions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>045 - Disclosure - Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/DisclosureScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlockDetails</Role>
      <ShortName>Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>046 - Disclosure - Schedule of Secured Convertible Debentures, Allocation of the Purchase (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/DisclosureScheduleOfSecuredConvertibleDebenturesAllocationOfThePurchaseTableTextBlockDetails</Role>
      <ShortName>Schedule of Secured Convertible Debentures, Allocation of the Purchase (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>047 - Disclosure - Schedule of Convertible Debentures, allocation of the purchase (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/ScheduleOfConvertibleDebenturesAllocationOfPurchaseDetails</Role>
      <ShortName>Schedule of Convertible Debentures, allocation of the purchase (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>048 - Disclosure - Schedule of Derivative Liabilities at Fair Value (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/DisclosureScheduleOfDerivativeLiabilitiesAtFairValueTableTextBlockDetails</Role>
      <ShortName>Schedule of Derivative Liabilities at Fair Value (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>049 - Disclosure - Schedule of Derivative Intruments, Amounts reflected in Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/ScheduleOfDerivativeIntrumentsAmountsReflectedInIncomeDetails</Role>
      <ShortName>Schedule of Derivative Intruments, Amounts reflected in Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>050 - Disclosure - Schedule of Convertible Debentures, Fair Value Assumptions, Method Used (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/ScheduleOfConvertibleDebenturesFairValueAssumptionsMethodUsedDetails</Role>
      <ShortName>Schedule of Convertible Debentures, Fair Value Assumptions, Method Used (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>051 - Disclosure - Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/DisclosureScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsByGeographicalAreasTableTextBlockDetails</Role>
      <ShortName>Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="sdev-20190228.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>052 - Disclosure - Schedule of Segment Reporting Information, by Segment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.securitydevicesinternational.com/role/DisclosureScheduleOfSegmentReportingInformationBySegmentTextBlockDetails</Role>
      <ShortName>Schedule of Segment Reporting Information, by Segment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>sdev-20190228.xml</File>
    <File>sdev-20190228.xsd</File>
    <File>sdev-20190228_cal.xml</File>
    <File>sdev-20190228_def.xml</File>
    <File>sdev-20190228_lab.xml</File>
    <File>sdev-20190228_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy>http://fasb.org/srt/2018-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/country/2017-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://fasb.org/us-gaap/2018-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/dei/2018-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/stpr/2018-01-31</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
