<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>293</ContextCount>
  <ElementCount>71</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>82</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>2</UnitCount>
  <MyReports>
    <Report instance="c117170_485bpos-ixbrl.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>010000 - Disclosure - Form N-1A Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/N1aCover</Role>
      <ShortName>Form N-1A Cover</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="c117170_485bpos-ixbrl.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>010002 - Disclosure - Investment Objectives and Goals</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/RiskReturn</Role>
      <ShortName>Investment Objectives and Goals</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="c117170_485bpos-ixbrl.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>010003 - Disclosure - Fees and Expenses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/FeesAndExpenses</Role>
      <ShortName>Fees and Expenses</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="c117170_485bpos-ixbrl.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>010004 - Disclosure - Investment Strategy</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/InvestmentStrategy</Role>
      <ShortName>Investment Strategy</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="c117170_485bpos-ixbrl.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>010005 - Disclosure - Investment Risks</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/InvestmentRisks</Role>
      <ShortName>Investment Risks</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="c117170_485bpos-ixbrl.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>010006 - Disclosure - Performance Management</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/PerformanceManagement</Role>
      <ShortName>Performance Management</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="c117170_485bpos-ixbrl.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>020010 - Disclosure - Shareholder Fees</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/ShareholderFeesData</Role>
      <ShortName>Shareholder Fees</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="c117170_485bpos-ixbrl.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>020020 - Disclosure - Annual Fund Operating Expenses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/OperatingExpensesData</Role>
      <ShortName>Annual Fund Operating Expenses</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="c117170_485bpos-ixbrl.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>020030 - Disclosure - Expense Example</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/ExpenseExample</Role>
      <ShortName>Expense Example</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="c117170_485bpos-ixbrl.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>020050 - Disclosure - Annual Total Returns</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/BarChartData</Role>
      <ShortName>Annual Total Returns</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="c117170_485bpos-ixbrl.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>020060 - Disclosure - Average Annual Total Returns</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/PerformanceTableData</Role>
      <ShortName>Average Annual Total Returns</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="c117170_485bpos-ixbrl.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>020100 - Document - Risk/Return Summary {Unlabeled} - Mercer US Small/Mid Cap Equity Fund - Mercer US Small/Mid Cap Equity Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.mercer.com/20260331/role/DocumentRiskReturnSummaryUnlabeledMercerUSSmallMidCapEquityFundMercerUSSmallMidCapEquityFund</Role>
      <ShortName>Risk/Return Summary- Mercer US Small/Mid Cap Equity Fund - Mercer US Small/Mid Cap Equity Fund</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="c117170_485bpos-ixbrl.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>020101 - Disclosure - Risk/Return Detail Data {Elements} - Mercer US Small/Mid Cap Equity Fund - Mercer US Small/Mid Cap Equity Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.mercer.com/20260331/role/DisclosureRiskReturnDetailDataElementsMercerUSSmallMidCapEquityFundMercerUSSmallMidCapEquityFund</Role>
      <ShortName>Risk/Return Detail Data- Mercer US Small/Mid Cap Equity Fund - Mercer US Small/Mid Cap Equity Fund</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="c117170_485bpos-ixbrl.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>020102 - Document - Risk/Return Summary {Unlabeled} - Mercer Non-US Core Equity Fund - Mercer Non-US Core Equity Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.mercer.com/20260331/role/DocumentRiskReturnSummaryUnlabeledMercerNonUSCoreEquityFundMercerNonUSCoreEquityFund</Role>
      <ShortName>Risk/Return Summary- Mercer Non-US Core Equity Fund - Mercer Non-US Core Equity Fund</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="c117170_485bpos-ixbrl.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>020103 - Disclosure - Risk/Return Detail Data {Elements} - Mercer Non-US Core Equity Fund - Mercer Non-US Core Equity Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.mercer.com/20260331/role/DisclosureRiskReturnDetailDataElementsMercerNonUSCoreEquityFundMercerNonUSCoreEquityFund</Role>
      <ShortName>Risk/Return Detail Data- Mercer Non-US Core Equity Fund - Mercer Non-US Core Equity Fund</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="c117170_485bpos-ixbrl.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>020104 - Document - Risk/Return Summary {Unlabeled} - Mercer Emerging Markets Equity Fund - Mercer Emerging Markets Equity Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.mercer.com/20260331/role/DocumentRiskReturnSummaryUnlabeledMercerEmergingMarketsEquityFundMercerEmergingMarketsEquityFund</Role>
      <ShortName>Risk/Return Summary- Mercer Emerging Markets Equity Fund - Mercer Emerging Markets Equity Fund</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="c117170_485bpos-ixbrl.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>020105 - Disclosure - Risk/Return Detail Data {Elements} - Mercer Emerging Markets Equity Fund - Mercer Emerging Markets Equity Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.mercer.com/20260331/role/DisclosureRiskReturnDetailDataElementsMercerEmergingMarketsEquityFundMercerEmergingMarketsEquityFund</Role>
      <ShortName>Risk/Return Detail Data- Mercer Emerging Markets Equity Fund - Mercer Emerging Markets Equity Fund</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="c117170_485bpos-ixbrl.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>020106 - Document - Risk/Return Summary {Unlabeled} - Mercer Core Fixed Income Fund - Mercer Core Fixed Income Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.mercer.com/20260331/role/DocumentRiskReturnSummaryUnlabeledMercerCoreFixedIncomeFundMercerCoreFixedIncomeFund</Role>
      <ShortName>Risk/Return Summary- Mercer Core Fixed Income Fund - Mercer Core Fixed Income Fund</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="c117170_485bpos-ixbrl.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>020107 - Disclosure - Risk/Return Detail Data {Elements} - Mercer Core Fixed Income Fund - Mercer Core Fixed Income Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.mercer.com/20260331/role/DisclosureRiskReturnDetailDataElementsMercerCoreFixedIncomeFundMercerCoreFixedIncomeFund</Role>
      <ShortName>Risk/Return Detail Data- Mercer Core Fixed Income Fund - Mercer Core Fixed Income Fund</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="c117170_485bpos-ixbrl.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>020108 - Document - Risk/Return Summary {Unlabeled} - Mercer Opportunistic Fixed Income Fund - Mercer Opportunistic Fixed Income Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.mercer.com/20260331/role/DocumentRiskReturnSummaryUnlabeledMercerOpportunisticFixedIncomeFundMercerOpportunisticFixedIncomeFund</Role>
      <ShortName>Risk/Return Summary- Mercer Opportunistic Fixed Income Fund - Mercer Opportunistic Fixed Income Fund</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="c117170_485bpos-ixbrl.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>020109 - Disclosure - Risk/Return Detail Data {Elements} - Mercer Opportunistic Fixed Income Fund - Mercer Opportunistic Fixed Income Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.mercer.com/20260331/role/DisclosureRiskReturnDetailDataElementsMercerOpportunisticFixedIncomeFundMercerOpportunisticFixedIncomeFund</Role>
      <ShortName>Risk/Return Detail Data- Mercer Opportunistic Fixed Income Fund - Mercer Opportunistic Fixed Income Fund</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="c117170_485bpos-ixbrl.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>020110 - Document - Risk/Return Summary {Unlabeled} - Mercer Short Duration Fixed Income Fund - Mercer Short Duration Fixed Income Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.mercer.com/20260331/role/DocumentRiskReturnSummaryUnlabeledMercerShortDurationFixedIncomeFundMercerShortDurationFixedIncomeFund</Role>
      <ShortName>Risk/Return Summary- Mercer Short Duration Fixed Income Fund - Mercer Short Duration Fixed Income Fund</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="c117170_485bpos-ixbrl.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>020111 - Disclosure - Risk/Return Detail Data {Elements} - Mercer Short Duration Fixed Income Fund - Mercer Short Duration Fixed Income Fund</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.mercer.com/20260331/role/DisclosureRiskReturnDetailDataElementsMercerShortDurationFixedIncomeFundMercerShortDurationFixedIncomeFund</Role>
      <ShortName>Risk/Return Detail Data- Mercer Short Duration Fixed Income Fund - Mercer Short Duration Fixed Income Fund</ShortName>
      <MenuCategory>Risk/Return</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="485BPOS" isN1a="true" isOEF="true" isRRorOEF="true" isUsgaap="true" original="c117170_485bpos-ixbrl.htm">c117170_485bpos-ixbrl.htm</File>
    <File>ck0001320615-20260331.xsd</File>
    <File>ck0001320615-20260331_def.xml</File>
    <File>ck0001320615-20260331_lab.xml</File>
    <File>ck0001320615-20260331_pre.xml</File>
  </InputFiles>
  <SupplementalFiles>
    <File>x4_c117170x16x1.jpg</File>
    <File>x4_c117170x193x1.jpg</File>
    <File>x4_c117170x197x1.jpg</File>
    <File>x4_c117170x203x1.jpg</File>
    <File>x4_c117170x205x1.jpg</File>
    <File>x4_c117170x205x2.jpg</File>
    <File>x4_c117170x205x3.jpg</File>
    <File>x4_c117170x205x4.jpg</File>
    <File>x4_c117170x219x1.jpg</File>
    <File>x4_c117170x226x1.jpg</File>
    <File>x4_c117170x228x1.jpg</File>
    <File>x4_c117170x228x2.jpg</File>
    <File>x4_c117170x256x1.jpg</File>
    <File>x4_c117170x25x1.jpg</File>
    <File>x4_c117170x290x1.jpg</File>
    <File>x4_c117170x292x1.jpg</File>
    <File>x4_c117170x294x1.jpg</File>
    <File>x4_c117170x295x1.jpg</File>
    <File>x4_c117170x298x1.jpg</File>
    <File>x4_c117170x317x1.jpg</File>
    <File>x4_c117170x330x1.jpg</File>
    <File>x4_c117170x33x1.jpg</File>
    <File>x4_c117170x344x1.gif</File>
    <File>x4_c117170x345x1.jpg</File>
    <File>x4_c117170x359x1.jpg</File>
    <File>x4_c117170x388x1.jpg</File>
    <File>x4_c117170x399x1.jpg</File>
    <File>x4_c117170x41x1.jpg</File>
    <File>x4_c117170x437x1.jpg</File>
    <File>x4_c117170x439x1.jpg</File>
    <File>x4_c117170x453x1.jpg</File>
    <File>x4_c117170x455x1.jpg</File>
    <File>x4_c117170x466x1.jpg</File>
    <File>x4_c117170x477x1.jpg</File>
    <File>x4_c117170x50x1.jpg</File>
    <File>x4_c117170x8x1.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="6">http://xbrl.sec.gov/dei/2026</BaseTaxonomy>
    <BaseTaxonomy items="10">http://xbrl.sec.gov/fnd/2026</BaseTaxonomy>
    <BaseTaxonomy items="821">http://xbrl.sec.gov/oef/2026</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
