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  xmlns:dei="http://xbrl.sec.gov/dei/2019-01-31"
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  xmlns:srg="http://seritage.com/20200409"
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        <entity>
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        <period>
            <startDate>2020-04-09</startDate>
            <endDate>2020-04-09</endDate>
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    <context id="c20200409to20200409_StatementClassOfStockAxis_Seven00SeriesACumulativeRedeemablePreferredSharesOfBeneficialInterestParValue001PerShareMember">
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            <endDate>2020-04-09</endDate>
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    </context>
    <dei:AmendmentFlag
      contextRef="c20200409to20200409"
      id="Fact_acfad527f41b4adb8174f8f0d265151b">false</dei:AmendmentFlag>
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      contextRef="c20200409to20200409"
      id="Fact_b15fefeb4ea942f78d15a9e00dfdb97b">0001628063</dei:EntityCentralIndexKey>
    <dei:DocumentType
      contextRef="c20200409to20200409"
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      contextRef="c20200409to20200409"
      id="Fact_7884422577ee425ba28f48a26f28856d">2020-04-09</dei:DocumentPeriodEndDate>
    <dei:EntityRegistrantName
      contextRef="c20200409to20200409"
      id="Fact_2e2bd5fd12c04c00811ba78265dfa305">SERITAGE GROWTH PROPERTIES</dei:EntityRegistrantName>
    <dei:EntityIncorporationStateCountryCode
      contextRef="c20200409to20200409"
      id="Fact_0da4fb54f2e746d0ab67e257455d1fee">MD</dei:EntityIncorporationStateCountryCode>
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      contextRef="c20200409to20200409"
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      contextRef="c20200409to20200409"
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    <dei:EntityAddressAddressLine1
      contextRef="c20200409to20200409"
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    <dei:EntityAddressAddressLine2
      contextRef="c20200409to20200409"
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    <dei:EntityAddressCityOrTown
      contextRef="c20200409to20200409"
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    <dei:EntityAddressStateOrProvince
      contextRef="c20200409to20200409"
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    <dei:EntityAddressPostalZipCode
      contextRef="c20200409to20200409"
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    <dei:CityAreaCode
      contextRef="c20200409to20200409"
      id="Fact_c1963ca90b0e4e7597a515beb1dd86c7">212</dei:CityAreaCode>
    <dei:LocalPhoneNumber
      contextRef="c20200409to20200409"
      id="Fact_8cdd95f462314267baf2ade7d0b66f26">355-7800</dei:LocalPhoneNumber>
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    <dei:TradingSymbol
      contextRef="c20200409to20200409_StatementClassOfStockAxis_CommonClassAMember"
      id="Fact_4f80c7b2211f43448846a03434519b91">SRG</dei:TradingSymbol>
    <dei:SecurityExchangeName
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    <dei:TradingSymbol
      contextRef="c20200409to20200409_StatementClassOfStockAxis_Seven00SeriesACumulativeRedeemablePreferredSharesOfBeneficialInterestParValue001PerShareMember"
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      contextRef="c20200409to20200409"
      id="Fact_f5c8e44398554062bb6d605a60fde6f9">false</dei:WrittenCommunications>
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      contextRef="c20200409to20200409"
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      contextRef="c20200409to20200409"
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      contextRef="c20200409to20200409"
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