<?xml version="1.0" encoding="utf-8"?>
<xbrl
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  xmlns:xbrldi="http://xbrl.org/2006/xbrldi"
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    <link:schemaRef
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    <context id="From2026-06-04to2026-06-04">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0002116230</identifier>
        </entity>
        <period>
            <startDate>2026-06-04</startDate>
            <endDate>2026-06-04</endDate>
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    <context id="OfferingAxis_From2026-06-04to2026-06-04_1">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0002116230</identifier>
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        <period>
            <startDate>2026-06-04</startDate>
            <endDate>2026-06-04</endDate>
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    <context id="OfferingAxis_From2026-06-04to2026-06-04_2">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0002116230</identifier>
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        <period>
            <startDate>2026-06-04</startDate>
            <endDate>2026-06-04</endDate>
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    </context>
    <context id="OfferingAxis_From2026-06-04to2026-06-04_3">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0002116230</identifier>
            <segment>
                <xbrldi:typedMember dimension="ffd:OfferingAxis">
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        <period>
            <startDate>2026-06-04</startDate>
            <endDate>2026-06-04</endDate>
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    </context>
    <unit id="USD">
        <measure>iso4217:USD</measure>
    </unit>
    <unit id="Pure">
        <measure>pure</measure>
    </unit>
    <ffd:CombinedProspectusTableNa contextRef="From2026-06-04to2026-06-04" id="ixv-724">N/A</ffd:CombinedProspectusTableNa>
    <ffd:OffsetTableNa contextRef="From2026-06-04to2026-06-04" id="ixv-725">N/A</ffd:OffsetTableNa>
    <ffd:FeeExhibitTp contextRef="From2026-06-04to2026-06-04" id="ixv-726">EX-FILING FEES</ffd:FeeExhibitTp>
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    <dei:EntityRegistrantName contextRef="From2026-06-04to2026-06-04" id="ixv-729">Southern Cross Acquisition I Corp.</dei:EntityRegistrantName>
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    <ffd:PrevslyPdFlg
      contextRef="OfferingAxis_From2026-06-04to2026-06-04_1"
      id="fid_479fc4af">false</ffd:PrevslyPdFlg>
    <ffd:OfferingSctyTp
      contextRef="OfferingAxis_From2026-06-04to2026-06-04_1"
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    <ffd:OfferingSctyTitl
      contextRef="OfferingAxis_From2026-06-04to2026-06-04_1"
      id="fid_71fd685a">Units, each consisting of one ordinary share, $0.0001 par value, one redeemable warrant, and one right to acquire one-fourth of one ordinary share(2)</ffd:OfferingSctyTitl>
    <ffd:Rule457aFlg
      contextRef="OfferingAxis_From2026-06-04to2026-06-04_1"
      id="fid_f09b7acc">true</ffd:Rule457aFlg>
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      contextRef="OfferingAxis_From2026-06-04to2026-06-04_1"
      decimals="INF"
      id="fid_1de4b1b7"
      unitRef="Pure">11500000</ffd:AmtSctiesRegd>
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      contextRef="OfferingAxis_From2026-06-04to2026-06-04_1"
      decimals="INF"
      id="fid_da3fb64f"
      unitRef="Pure">10</ffd:MaxOfferingPricPerScty>
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      contextRef="OfferingAxis_From2026-06-04to2026-06-04_1"
      decimals="INF"
      id="fid_0753fd5d"
      unitRef="USD">115000000</ffd:MaxAggtOfferingPric>
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      contextRef="OfferingAxis_From2026-06-04to2026-06-04_1"
      decimals="INF"
      id="fid_f4d2cbc2"
      unitRef="Pure">0.00013810</ffd:FeeRate>
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      contextRef="OfferingAxis_From2026-06-04to2026-06-04_1"
      decimals="INF"
      id="fid_8cd681c9"
      unitRef="USD">15881.5</ffd:FeeAmt>
    <ffd:PrevslyPdFlg
      contextRef="OfferingAxis_From2026-06-04to2026-06-04_2"
      id="fid_3806c85d">false</ffd:PrevslyPdFlg>
    <ffd:OfferingSctyTp
      contextRef="OfferingAxis_From2026-06-04to2026-06-04_2"
      id="fid_2e2b0217">Equity</ffd:OfferingSctyTp>
    <ffd:OfferingSctyTitl
      contextRef="OfferingAxis_From2026-06-04to2026-06-04_2"
      id="fid_7966deec">Ordinary Shares underlying rights included as part of units</ffd:OfferingSctyTitl>
    <ffd:Rule457aFlg
      contextRef="OfferingAxis_From2026-06-04to2026-06-04_2"
      id="fid_64821e32">true</ffd:Rule457aFlg>
    <ffd:AmtSctiesRegd
      contextRef="OfferingAxis_From2026-06-04to2026-06-04_2"
      decimals="INF"
      id="fid_d8908ec5"
      unitRef="Pure">2875000</ffd:AmtSctiesRegd>
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      contextRef="OfferingAxis_From2026-06-04to2026-06-04_2"
      decimals="INF"
      id="fid_f765828d"
      unitRef="Pure">10</ffd:MaxOfferingPricPerScty>
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      contextRef="OfferingAxis_From2026-06-04to2026-06-04_2"
      decimals="INF"
      id="fid_3ef2e822"
      unitRef="USD">28750000</ffd:MaxAggtOfferingPric>
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      contextRef="OfferingAxis_From2026-06-04to2026-06-04_2"
      decimals="INF"
      id="fid_63f213cf"
      unitRef="Pure">0.00013810</ffd:FeeRate>
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      contextRef="OfferingAxis_From2026-06-04to2026-06-04_2"
      decimals="INF"
      id="fid_7c6e9cf1"
      unitRef="USD">3970.38</ffd:FeeAmt>
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      contextRef="OfferingAxis_From2026-06-04to2026-06-04_3"
      id="fid_9342ecaa">false</ffd:PrevslyPdFlg>
    <ffd:OfferingSctyTp
      contextRef="OfferingAxis_From2026-06-04to2026-06-04_3"
      id="fid_8cff5db4">Equity</ffd:OfferingSctyTp>
    <ffd:OfferingSctyTitl
      contextRef="OfferingAxis_From2026-06-04to2026-06-04_3"
      id="fid_7f7c8d05">Representative's ordinary shares</ffd:OfferingSctyTitl>
    <ffd:Rule457aFlg
      contextRef="OfferingAxis_From2026-06-04to2026-06-04_3"
      id="fid_57f757ca">true</ffd:Rule457aFlg>
    <ffd:AmtSctiesRegd
      contextRef="OfferingAxis_From2026-06-04to2026-06-04_3"
      decimals="INF"
      id="fid_505ab966"
      unitRef="Pure">115000</ffd:AmtSctiesRegd>
    <ffd:MaxOfferingPricPerScty
      contextRef="OfferingAxis_From2026-06-04to2026-06-04_3"
      decimals="INF"
      id="fid_f037180e"
      unitRef="Pure">10</ffd:MaxOfferingPricPerScty>
    <ffd:MaxAggtOfferingPric
      contextRef="OfferingAxis_From2026-06-04to2026-06-04_3"
      decimals="INF"
      id="fid_4b6e3d8b"
      unitRef="USD">1150000</ffd:MaxAggtOfferingPric>
    <ffd:FeeRate
      contextRef="OfferingAxis_From2026-06-04to2026-06-04_3"
      decimals="INF"
      id="fid_2e704019"
      unitRef="Pure">0.00013810</ffd:FeeRate>
    <ffd:FeeAmt
      contextRef="OfferingAxis_From2026-06-04to2026-06-04_3"
      decimals="INF"
      id="fid_7d3fdaf2"
      unitRef="USD">158.82</ffd:FeeAmt>
    <ffd:TtlOfferingAmt
      contextRef="From2026-06-04to2026-06-04"
      decimals="INF"
      id="fid_1f97b316"
      unitRef="USD">144900000</ffd:TtlOfferingAmt>
    <ffd:TtlFeeAmt
      contextRef="From2026-06-04to2026-06-04"
      decimals="INF"
      id="fid_c484cf44"
      unitRef="USD">20010.69</ffd:TtlFeeAmt>
    <ffd:NetFeeAmt
      contextRef="From2026-06-04to2026-06-04"
      decimals="INF"
      id="fid_4230401e"
      unitRef="USD">20010.69</ffd:NetFeeAmt>
    <ffd:OfferingNote
      contextRef="OfferingAxis_From2026-06-04to2026-06-04_1"
      id="fid_5e0a22ab">&lt;table cellpadding="0" style="border-spacing:0;font-size:10pt;width:100%"&gt;&lt;tbody&gt;&lt;tr style="height:15px"&gt;&lt;td style="width:4%;vertical-align:top;"&gt;&lt;p style="font-size:10pt;font-family:times new roman;margin:0px"&gt;(1)&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top;"&gt;&lt;p style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; MARGIN: 0px; text-align:justify;"&gt;Estimated solely for the purpose of calculating the registration fee pursuant to Rule 457(a) under the Securities Act.&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/tbody&gt;&lt;/table&gt;</ffd:OfferingNote>
    <ffd:OfferingNote
      contextRef="OfferingAxis_From2026-06-04to2026-06-04_2"
      id="fid_09b99fa7">&lt;table cellpadding="0" style="border-spacing:0;font-size:10pt;width:100%"&gt;&lt;tbody&gt;&lt;tr style="height:15px"&gt;&lt;td style="width:4%;vertical-align:top;"&gt;&lt;p style="font-size:10pt;font-family:times new roman;margin:0px"&gt;(2)&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top;"&gt;&lt;p style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; MARGIN: 0px; text-align:justify;"&gt;Representing 11,500,000 units including 10,000,000 units to be issued in the offering and up to 1,500,000 units which may be issued upon exercise of a 45-day option granted to the underwriters to cover over-allotments, if any, each consisting of one ordinary share, one redeemable warrant and one right to acquire one-fourth of one ordinary share.&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/tbody&gt;&lt;/table&gt;</ffd:OfferingNote>
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      contextRef="OfferingAxis_From2026-06-04to2026-06-04_3"
      id="fid_8e5108b6">&lt;table cellpadding="0" style="border-spacing:0;font-size:10pt;width:100%"&gt;&lt;tbody&gt;&lt;tr style="height:15px"&gt;&lt;td style="width:4%;vertical-align:top;"&gt;&lt;p style="font-size:10pt;font-family:times new roman;margin:0px"&gt;(3)&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top;"&gt;&lt;p style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; MARGIN: 0px; text-align:justify;"&gt;Pursuant to Rule&#160;416(a), there are also being registered an indeterminable number of additional securities as may be issued to prevent dilution resulting from stock splits, stock dividends or similar transactions.&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/tbody&gt;&lt;/table&gt;&lt;p style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; MARGIN: 0px; text-align:justify;"&gt;&#160;&lt;/p&gt;&lt;table cellpadding="0" style="border-spacing:0;font-size:10pt;width:100%"&gt;&lt;tbody&gt;&lt;tr style="height:15px"&gt;&lt;td style="width:4%;vertical-align:top;"&gt;&lt;p style="font-size:10pt;font-family:times new roman;margin:0px"&gt;(4)&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top;"&gt;&lt;p style="FONT-SIZE: 10pt; FONT-FAMILY: times new roman; MARGIN: 0px; text-align:justify;"&gt;An additional indeterminate amount of securities are being registered hereby to be offered solely for certain market making transactions, by affiliates of the Registrant. Pursuant to Rule&#160;457(g)&#160;under the Securities Act, no additional filing fee is required.&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/tbody&gt;&lt;/table&gt;</ffd:OfferingNote>
</xbrl>
