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      id="t_8_0e126c91_f293_367e_bfa6_7e1847878d1b">This Semi-Annual shareholder report contains important information about the Davis Real Estate Portfolio (the &#x201c;Fund&#x201d;) for the period of January 1, 2026 to June 30, 2026 (the &#x201c;period&#x201d;).</oef:AnnlOrSemiAnnlStatementTextBlock>
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      id="t_10_0ef42010_3674_2fad_2601_e79f4e43b0cd">You can find additional information about the Fund at &lt;span style="text-decoration-line: underline; color: rgb(8, 62, 28); font-family: 'times new roman'; font-size: 9pt; text-align: justify;"&gt;davisfunds.com/resources/regulatory-documents&lt;/span&gt; or by contacting Investor Services at 1-800-279-0279.</oef:AddlInfoTextBlock>
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&lt;div style="margin-top: 0px; font-family: 'times new roman'; color: rgb(8, 62, 28); font-size: 11.52pt; font-weight: bold; margin-bottom: 3pt;"&gt;What were the Fund expenses for the last six months?&lt;/div&gt;

&lt;div style="margin-top: 0px; margin-bottom: 0px; font-family: 'times new roman'; color: rgb(0, 0, 0); font-size: 9pt;"&gt;&lt;i&gt;(Based on a hypothetical $10,000 investment)&lt;/i&gt;&lt;/div&gt;

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&lt;td style="break-inside: avoid-page; font-family: 'Times New Roman'; font-size: 9pt; font-weight: bold; text-align: left; vertical-align: bottom; color: rgb(8, 62, 28); padding: 6pt 3pt 3pt 3pt;"&gt;Fund&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; font-weight: bold; vertical-align: bottom; padding: 6pt 3pt 3pt 3pt;"&gt;Costs of $10,000 investment&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; font-weight: bold; vertical-align: bottom; padding: 6pt 3pt 3pt 3pt;"&gt;Costs paid as a percentage of a $10,000 investment&lt;/td&gt;
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&lt;td style="break-inside: avoid-page; text-align: left; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; vertical-align: bottom; padding: 6pt 3pt 3pt 3pt;"&gt;Davis Real Estate Portfolio&lt;br/&gt;&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; vertical-align: bottom; padding: 6pt 3pt 3pt 3pt;"&gt;&lt;span style="float: none;"&gt;$&lt;/span&gt;53&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; white-space: nowrap; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; vertical-align: bottom; padding: 6pt 3pt 3pt 3pt;"&gt;1.00&lt;span&gt;%&lt;/span&gt;&lt;span&gt;*&lt;/span&gt;&lt;/td&gt;
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&lt;td style="break-inside: avoid-page; font-family: 'Times New Roman'; font-style: italic; color: rgb(0, 0, 0); text-align: left; font-size: 6pt; vertical-align: top; width: 1%; padding: 0 4pt 0 0;"&gt;*&lt;/td&gt;
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&lt;div style="margin-top: 0px; font-family: 'times new roman'; color: rgb(0, 0, 0); margin-bottom: 10pt; text-align: justify; vertical-align: bottom; font-size: 8pt;"&gt;Annualized.&lt;/div&gt;
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&lt;div style="margin-bottom: 14pt;"&gt;
&lt;div style="break-inside: avoid;"&gt;
&lt;div style="font-family: 'times new roman'; color: rgb(8, 62, 28); font-size: 11.52pt; font-weight: bold; margin-bottom: 3pt; margin-top: 14pt;"&gt;Management&#x2019;s Discussion of Fund Performance&lt;/div&gt;
&lt;div style="margin-top: 0px; font-family: 'times new roman'; color: rgb(8, 62, 28); letter-spacing: 1.25px; text-transform: uppercase; font-size: 9pt; font-weight: bold; margin-bottom: 3pt;"&gt;Summary of Results&lt;/div&gt;
&lt;div style="margin-top: 0px; font-family: 'times new roman'; color: rgb(0, 0, 0); font-size: 9pt; margin-bottom: 10pt; text-align: justify;"&gt;The Fund slightly underperformed the Wilshire U.S. Real Estate Securities Index (&#x201c;Wilshire Index&#x201d; or the &#x201c;Index&#x201d;) for the period. The Fund delivered a total return of 12.28%, versus a 12.36% return for the Wilshire Index. The Fund invests, under normal conditions, at least 80% of its net assets in securities issued by companies principally engaged in the real estate industry.&lt;/div&gt;
&lt;/div&gt;
&lt;div style="break-inside: avoid;"&gt;
&lt;div style="font-family: 'times new roman'; color: rgb(8, 62, 28); letter-spacing: 1.25px; text-transform: uppercase; font-size: 9pt; font-weight: bold; margin-bottom: 3pt; margin-top: 10pt;"&gt;Market Overview&lt;/div&gt;
&lt;ul style="break-inside: avoid; padding: 0; margin: 0;"&gt;
&lt;li style="padding-left: 13.5pt; margin-left: 30pt; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; list-style-type: disc; text-align: justify;"&gt;
&lt;div style="margin-top: 0px; margin-bottom: 0px;"&gt;Wilshire Index&lt;/div&gt;
&lt;ul style="break-inside: avoid; padding: 0; margin: 0;"&gt;
&lt;li style="padding-left: 13.5pt; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; list-style-type: circle; text-align: justify; margin-left: 52pt;"&gt;
&lt;div style="margin-top: 0px; margin-bottom: 0px;"&gt;Strongest performing industries - Hotel &amp;amp; Resort REITs (+42%), Health Care REITs (+20%), and Retail REITs (+20%)&lt;/div&gt;
&lt;/li&gt;
&lt;li style="padding-left: 13.5pt; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; list-style-type: circle; text-align: justify; margin-left: 52pt;"&gt;
&lt;div style="margin-top: 0px; margin-bottom: 0px;"&gt;Weakest performing industries - Real Estate Management &amp;amp; Development (-18%), Residential REITs (+7%), and Industrial REITs (+8%)&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
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&lt;/div&gt;
&lt;div style="break-inside: avoid;"&gt;
&lt;div style="font-family: 'times new roman'; color: rgb(8, 62, 28); letter-spacing: 1.25px; text-transform: uppercase; font-size: 9pt; font-weight: bold; margin-bottom: 3pt; margin-top: 10pt;"&gt;Detractors from Performance&lt;/div&gt;
&lt;/div&gt;
&lt;ul style="break-inside: avoid; padding: 0; margin: 0;"&gt;
&lt;li style="padding-left: 13.5pt; margin-left: 30pt; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; list-style-type: disc; text-align: justify;"&gt;
&lt;div style="margin-top: 0px; margin-bottom: 0px;"&gt;Underweight in Health Care REITs - (average weighting 10% vs 16%)&lt;/div&gt;
&lt;ul style="break-inside: avoid; padding: 0; margin: 0;"&gt;
&lt;li style="padding-left: 13.5pt; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; list-style-type: circle; text-align: justify; margin-left: 52pt;"&gt;
&lt;div style="margin-top: 0px; margin-bottom: 0px;"&gt;Alexandria Real Estate Equities (+11%) - negatively impacted by sales in second half of period when performance rebounded&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;li style="padding-left: 13.5pt; margin-left: 30pt; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; list-style-type: disc; text-align: justify;"&gt;
&lt;div style="margin-top: 0px; margin-bottom: 0px;"&gt;Industrial REITs - underperformed the Index industry (+6% vs +8%)&lt;/div&gt;
&lt;ul style="break-inside: avoid; padding: 0; margin: 0;"&gt;
&lt;li style="padding-left: 13.5pt; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; list-style-type: circle; text-align: justify; margin-left: 52pt;"&gt;
&lt;div style="margin-top: 0px; margin-bottom: 0px;"&gt;Rexford Industrial Realty (-11%) - largest individual detractor&lt;/div&gt;
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&lt;li style="padding-left: 13.5pt; margin-left: 30pt; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; list-style-type: disc; text-align: justify;"&gt;
&lt;div style="margin-top: 0px; margin-bottom: 0px;"&gt;Overweight in Residential REITs - (average weighting 17% vs 11%)&lt;/div&gt;
&lt;ul style="break-inside: avoid; padding: 0; margin: 0;"&gt;
&lt;li style="padding-left: 13.5pt; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; list-style-type: circle; text-align: justify; margin-left: 52pt;"&gt;
&lt;div style="margin-top: 0px; margin-bottom: 0px;"&gt;Sun Communities (-1%)&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;li style="padding-left: 13.5pt; margin-left: 30pt; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; list-style-type: disc; text-align: justify;"&gt;
&lt;div style="margin-top: 0px; margin-bottom: 0px;"&gt;Underweight in Retail REITs - (average weighting 10% vs 14%)&lt;/div&gt;
&lt;ul style="break-inside: avoid; padding: 0; margin: 0;"&gt;
&lt;li style="padding-left: 13.5pt; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; list-style-type: circle; text-align: justify; margin-left: 52pt;"&gt;
&lt;div style="margin-top: 0px; margin-bottom: 0px;"&gt;NETSTREIT (-3%) - no longer a Fund holding&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;li style="padding-left: 13.5pt; margin-left: 30pt; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; list-style-type: disc; text-align: justify;"&gt;
&lt;div style="margin-top: 0px; margin-bottom: 0px;"&gt;Individual holdings&lt;/div&gt;
&lt;ul style="break-inside: avoid; padding: 0; margin: 0;"&gt;
&lt;li style="padding-left: 13.5pt; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; list-style-type: circle; text-align: justify; margin-left: 52pt;"&gt;
&lt;div style="margin-top: 0px; margin-bottom: 0px;"&gt;SBA Communications (-19%), CBRE Group (-19%), American Tower (-5%), Jones Lang LaSalle (-12%), and VICI Properties (-2%)&lt;/div&gt;
&lt;/li&gt;
&lt;li style="padding-left: 13.5pt; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; list-style-type: circle; text-align: justify; margin-left: 52pt;"&gt;
&lt;div style="margin-top: 0px; margin-bottom: 0px;"&gt;SBA Communications, CBRE Group, and Jones Lang LaSalle - new purchases during the period&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;div style="break-inside: avoid;"&gt;
&lt;div style="font-family: 'times new roman'; color: rgb(8, 62, 28); letter-spacing: 1.25px; text-transform: uppercase; font-size: 9pt; font-weight: bold; margin-bottom: 3pt; margin-top: 10pt;"&gt;Contributors to Performance&lt;/div&gt;
&lt;/div&gt;
&lt;ul style="break-inside: avoid; padding: 0; margin: 0;"&gt;
&lt;li style="padding-left: 13.5pt; margin-left: 30pt; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; list-style-type: disc; text-align: justify;"&gt;
&lt;div style="margin-top: 0px; margin-bottom: 0px;"&gt;Specialized REITs - outperformed the Index industry (+18% vs +14%)&lt;/div&gt;
&lt;ul style="break-inside: avoid; padding: 0; margin: 0;"&gt;
&lt;li style="padding-left: 13.5pt; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; list-style-type: circle; text-align: justify; margin-left: 52pt;"&gt;
&lt;div style="margin-top: 0px; margin-bottom: 0px;"&gt;Equinix (+37%) and Fermi (+71%) - two largest individual contributors&lt;/div&gt;
&lt;/li&gt;
&lt;li style="padding-left: 13.5pt; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; list-style-type: circle; text-align: justify; margin-left: 52pt;"&gt;
&lt;div style="margin-top: 0px; margin-bottom: 0px;"&gt;Public Storage (+25%) and Digital Realty Trust (+18%)&lt;/div&gt;
&lt;/li&gt;
&lt;li style="padding-left: 13.5pt; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; list-style-type: circle; text-align: justify; margin-left: 52pt;"&gt;
&lt;div style="margin-top: 0px; margin-bottom: 0px;"&gt;Fermi - new purchase during the period&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;li style="padding-left: 13.5pt; margin-left: 30pt; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; list-style-type: disc; text-align: justify;"&gt;
&lt;div style="margin-top: 0px; margin-bottom: 0px;"&gt;Underweight in Real Estate Management &amp;amp; Development (average weighting 4% vs 6%), the weakest performing industry of the Index&lt;/div&gt;
&lt;/li&gt;
&lt;li style="padding-left: 13.5pt; margin-left: 30pt; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; list-style-type: disc; text-align: justify;"&gt;
&lt;div style="margin-top: 0px; margin-bottom: 0px;"&gt;Office REITs - outperformed the Index industry (+15% vs +13%) and overweight (average weighting 18% vs 3%)&lt;/div&gt;
&lt;ul style="break-inside: avoid; padding: 0; margin: 0;"&gt;
&lt;li style="padding-left: 13.5pt; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; list-style-type: circle; text-align: justify; margin-left: 52pt;"&gt;
&lt;div style="margin-top: 0px; margin-bottom: 0px;"&gt;Cousins Properties (+19%) and COPT Defense Properties (+33%)&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;li style="padding-left: 13.5pt; margin-left: 30pt; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; list-style-type: disc; text-align: justify;"&gt;
&lt;div style="margin-top: 0px; margin-bottom: 0px;"&gt;Individual holdings&lt;/div&gt;
&lt;ul style="break-inside: avoid; padding: 0; margin: 0;"&gt;
&lt;li style="padding-left: 13.5pt; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; list-style-type: circle; text-align: justify; margin-left: 52pt;"&gt;
&lt;div style="margin-top: 0px; margin-bottom: 0px;"&gt;Healthpeak Properties (+38%), Brixmor Property Group (+23%), Simon Property Group (+24%), and Sunstone Hotel Investors (+30%)&lt;/div&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;
&lt;div style="break-before: always; margin-top: 0px; margin-bottom: 0px;"&gt; &lt;/div&gt;
&lt;/div&gt;
</oef:FactorsAffectingPerfTextBlock>
    <oef:AvgAnnlRtrTableTextBlock
      contextRef="D20251231_20260630_C000009559Member"
      id="t_14_84d17e7e_7687_09ce_2111_ad92a993b54d">
&lt;table style="width: 100%; border-collapse: collapse; break-inside: avoid;"&gt;

&lt;tr style="break-after: avoid; border-bottom-style: solid; border-bottom-width: 1pt; break-inside: avoid-page; height: 20pt; border-bottom-color: rgb(8, 62, 28);"&gt;
&lt;td style="break-inside: avoid-page; vertical-align: middle; font-family: 'Times New Roman'; font-size: 9pt; font-weight: bold; text-align: left; color: rgb(8, 62, 28); width: 60%; padding: 6pt 3pt 3pt 3pt;"&gt;AVERAGE ANNUAL TOTAL RETURN FOR PERIODS ENDED 06/30/26&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: middle; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; font-weight: bold; padding: 6pt 3pt 3pt 3pt;"&gt;1 Year&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: middle; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; font-weight: bold; padding: 6pt 3pt 3pt 3pt;"&gt;5 Years&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: middle; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; font-weight: bold; padding: 6pt 3pt 3pt 3pt;"&gt;10 Years&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="border-bottom-width: 1pt; border-bottom-style: solid; break-inside: avoid-page; height: 20pt; border-bottom-color: rgb(8, 62, 28);"&gt;
&lt;td style="break-inside: avoid-page; vertical-align: middle; text-align: left; color: rgb(0, 0, 0); font-size: 9pt; font-family: 'Times New Roman'; font-weight: normal; padding: 6pt 3pt 3pt 3pt;"&gt;&lt;strong&gt;Davis Real Estate Portfolio&lt;/strong&gt;&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: middle; white-space: nowrap; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; padding: 6pt 3pt 3pt 3pt;"&gt;7.97&lt;span&gt;%&lt;/span&gt;&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: middle; white-space: nowrap; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; padding: 6pt 3pt 3pt 3pt;"&gt;0.97&lt;span&gt;%&lt;/span&gt;&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: middle; white-space: nowrap; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; padding: 6pt 3pt 3pt 3pt;"&gt;3.89&lt;span&gt;%&lt;/span&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="border-bottom-width: 1pt; border-bottom-style: solid; break-inside: avoid-page; height: 20pt; border-bottom-color: rgb(8, 62, 28);"&gt;
&lt;td style="break-inside: avoid-page; vertical-align: middle; text-align: left; color: rgb(0, 0, 0); font-size: 9pt; font-family: 'Times New Roman'; font-weight: normal; padding: 6pt 3pt 3pt 3pt;"&gt;&lt;strong&gt;S&amp;amp;P 500 Index&lt;/strong&gt;&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: middle; white-space: nowrap; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; padding: 6pt 3pt 3pt 3pt;"&gt;22.32&lt;span&gt;%&lt;/span&gt;&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: middle; white-space: nowrap; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; padding: 6pt 3pt 3pt 3pt;"&gt;13.40&lt;span&gt;%&lt;/span&gt;&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: middle; white-space: nowrap; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; padding: 6pt 3pt 3pt 3pt;"&gt;15.50&lt;span&gt;%&lt;/span&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="border-bottom-width: 1pt; border-bottom-style: solid; break-inside: avoid-page; height: 20pt; border-bottom-color: rgb(8, 62, 28);"&gt;
&lt;td style="break-inside: avoid-page; vertical-align: middle; text-align: left; color: rgb(0, 0, 0); font-size: 9pt; font-family: 'Times New Roman'; font-weight: normal; padding: 6pt 3pt 3pt 3pt;"&gt;&lt;strong&gt;Wilshire U.S. Real Estate Securities Index&lt;/strong&gt;&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: middle; white-space: nowrap; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; padding: 6pt 3pt 3pt 3pt;"&gt;14.27&lt;span&gt;%&lt;/span&gt;&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: middle; white-space: nowrap; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; padding: 6pt 3pt 3pt 3pt;"&gt;5.17&lt;span&gt;%&lt;/span&gt;&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: middle; white-space: nowrap; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; padding: 6pt 3pt 3pt 3pt;"&gt;5.81&lt;span&gt;%&lt;/span&gt;&lt;/td&gt;
&lt;/tr&gt;

&lt;/table&gt;
</oef:AvgAnnlRtrTableTextBlock>
    <oef:LineGraphAndTableMeasureName
      contextRef="D20251231_20260630_C000009559Member"
      id="t_15_a08c7980_9cc9_b75d_b80f_1ea9798eb664">Davis Real Estate Portfolio</oef:LineGraphAndTableMeasureName>
    <oef:AvgAnnlRtrPct
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      id="h_3_4e6d98fb_6d19_4fdc_94c3_07fbddb89e09"
      unitRef="pure">0.0797</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="FiveY2026_C000009559Member"
      decimals="4"
      id="h_4_dd197e88_2090_4d32_9b0d_c1d79cb3b4f4"
      unitRef="pure">0.0097</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="TenY2026_C000009559Member"
      decimals="4"
      id="h_5_dbba4185_99e9_46c7_893b_82eba55268d5"
      unitRef="pure">0.0389</oef:AvgAnnlRtrPct>
    <oef:LineGraphAndTableMeasureName
      contextRef="D20251231_20260630_StandardPoors500IndexMember"
      id="t_19_14cfbc9b_5078_f651_951f_3c87a5101103">S&amp;P 500 Index</oef:LineGraphAndTableMeasureName>
    <oef:AvgAnnlRtrPct
      contextRef="FY2026_StandardPoors500IndexMember"
      decimals="4"
      id="h_6_7e676363_28ea_45b6_84d1_9612236428a6"
      unitRef="pure">0.2232</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="FiveY2026_StandardPoors500IndexMember"
      decimals="4"
      id="h_7_a16a7179_2c2b_4fbd_bcad_ff7dfc9fe53e"
      unitRef="pure">0.1340</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="TenY2026_StandardPoors500IndexMember"
      decimals="4"
      id="h_8_b0d1c5c4_bd40_4aa1_b52e_1b6ee524c880"
      unitRef="pure">0.1550</oef:AvgAnnlRtrPct>
    <oef:LineGraphAndTableMeasureName
      contextRef="D20251231_20260630_WilshireUSRealEstateSecuritiesIndexMember"
      id="t_20_be4c1117_d656_9d88_f50c_67b402679b63">Wilshire U.S. Real Estate Securities Index</oef:LineGraphAndTableMeasureName>
    <oef:AvgAnnlRtrPct
      contextRef="FY2026_WilshireUSRealEstateSecuritiesIndexMember"
      decimals="4"
      id="h_9_478a70f1_804b_412f_a015_b48cbe076499"
      unitRef="pure">0.1427</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="FiveY2026_WilshireUSRealEstateSecuritiesIndexMember"
      decimals="4"
      id="h_10_85eba98c_ac89_462f_92c8_c04d21d0c5d9"
      unitRef="pure">0.0517</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="TenY2026_WilshireUSRealEstateSecuritiesIndexMember"
      decimals="4"
      id="h_11_01f6933f_5131_4694_8833_e6f5794d59b1"
      unitRef="pure">0.0581</oef:AvgAnnlRtrPct>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="D20251231_20260630_C000009559Member"
      id="t_16_7e452051_294d_e964_84ec_ece3beacc55f">The Fund's past performance is not a good predictor of how the Fund will perform in the future.</oef:PerformancePastDoesNotIndicateFuture>
    <oef:UpdPerfInfoLocationTextBlock
      contextRef="D20251231_20260630_C000009559Member"
      id="t_22_4a8379d2_1387_2ebb_9a95_d996ff92a883">For most recent month-end performance information, please call Investor Services at 1-800-279-0279 or visit the Fund's website at www.davisfunds.com .</oef:UpdPerfInfoLocationTextBlock>
    <oef:AddlFundStatisticsTextBlock
      contextRef="D20251231_20260630_C000009559Member"
      id="t_17_ffd6d8fa_b4d0_7e34_9ddf_3ef184948585">
&lt;div style="border-bottom-width: 1pt; border-bottom-style: solid; font-family: 'times new roman'; color: rgb(8, 62, 28); letter-spacing: 1.25px; text-transform: uppercase; font-size: 9pt; font-weight: bold; border-bottom-color: rgb(8, 62, 28); text-align: center; padding-bottom: 5pt; margin-bottom: 5pt; margin-top: 5pt;"&gt;&lt;b&gt;Key Fund Statistics&lt;/b&gt;&lt;/div&gt;

&lt;table style="width: 100%; border-collapse: collapse; break-inside: avoid;"&gt;

&lt;tr style="border-bottom-style: solid; break-inside: avoid-page; height: 20pt; border-bottom-color: rgb(8, 62, 28); border-bottom-width: 1pt;"&gt;
&lt;td style="break-inside: avoid-page; vertical-align: middle; color: rgb(0, 0, 0); font-size: 9pt; text-align: left; width: 80%; font-weight: normal; font-family: 'Times New Roman'; padding: 6pt 0 3pt 10pt;"&gt;Fund net assets as of 06/30/26 (in millions)&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: middle; white-space: nowrap; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; padding: 6pt 10pt 3pt 10pt;"&gt;&lt;span style="float: none;"&gt;$&lt;/span&gt;7.2&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="border-bottom-style: solid; break-inside: avoid-page; height: 20pt; border-bottom-color: rgb(8, 62, 28); border-bottom-width: 1pt;"&gt;
&lt;td style="break-inside: avoid-page; vertical-align: middle; color: rgb(0, 0, 0); font-size: 9pt; text-align: left; width: 80%; font-weight: normal; font-family: 'Times New Roman'; padding: 6pt 0 3pt 10pt;"&gt;Total number of portfolio holdings as of 06/30/26&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: middle; white-space: nowrap; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; padding: 6pt 10pt 3pt 10pt;"&gt;41&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="border-bottom-style: solid; break-inside: avoid-page; height: 20pt; border-bottom-color: rgb(8, 62, 28); border-bottom-width: 1pt;"&gt;
&lt;td style="break-inside: avoid-page; vertical-align: middle; color: rgb(0, 0, 0); font-size: 9pt; text-align: left; width: 80%; font-weight: normal; font-family: 'Times New Roman'; padding: 6pt 0 3pt 10pt;"&gt;Portfolio turnover rate for the period&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: middle; white-space: nowrap; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; padding: 6pt 10pt 3pt 10pt;"&gt;13&lt;span&gt;%&lt;/span&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="border-bottom-style: solid; break-inside: avoid-page; height: 20pt; border-bottom-color: rgb(8, 62, 28); border-bottom-width: 1pt;"&gt;
&lt;td style="break-inside: avoid-page; vertical-align: middle; color: rgb(0, 0, 0); font-size: 9pt; text-align: left; width: 80%; font-weight: normal; font-family: 'Times New Roman'; padding: 6pt 0 3pt 10pt;"&gt;Total advisory fees paid for the period (Net advisory fee after waiver) (in thousands)&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: middle; white-space: nowrap; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; padding: 6pt 10pt 3pt 10pt;"&gt;&lt;span style="float: none;"&gt;$&lt;/span&gt;1.3&lt;/td&gt;
&lt;/tr&gt;

&lt;/table&gt;
</oef:AddlFundStatisticsTextBlock>
    <us-gaap:AssetsNet
      contextRef="TI20260630_C000009559Member"
      decimals="INF"
      id="h_12_97202ff6_5065_4e86_941d_7e30b8b29048"
      unitRef="USD">7200000</us-gaap:AssetsNet>
    <oef:HoldingsCount
      contextRef="TI20260630_C000009559Member"
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      id="h_13_dc20f474_f97a_408d_a6e4_4ea6e7a7c1dc"
      unitRef="Holding">41</oef:HoldingsCount>
    <us-gaap:InvestmentCompanyPortfolioTurnover
      contextRef="D20251231_20260630_C000009559Member"
      decimals="4"
      id="h_14_75f18457_4627_43b2_ae93_a90d875d1dd2"
      unitRef="pure">0.13</us-gaap:InvestmentCompanyPortfolioTurnover>
    <oef:AdvisoryFeesPaidAmt
      contextRef="D20251231_20260630_C000009559Member"
      decimals="INF"
      id="h_15_798db9bc_13a3_4027_b881_6fd586d49edb"
      unitRef="USD">1300</oef:AdvisoryFeesPaidAmt>
    <oef:HoldingsTableTextBlock
      contextRef="D20251231_20260630_C000009559Member"
      id="t_18_9b0fb31b_562c_ce94_658f_11eb8ec7763f">
&lt;div style="border-bottom-width: 1pt; border-bottom-style: solid; font-family: 'times new roman'; color: rgb(8, 62, 28); letter-spacing: 1.25px; text-transform: uppercase; font-size: 9pt; font-weight: bold; border-bottom-color: rgb(8, 62, 28); text-align: center; padding-bottom: 5pt; margin-bottom: 5pt; margin-top: 5pt;"&gt;&lt;b&gt;Top Industries&lt;/b&gt; &lt;b&gt; as of &lt;/b&gt; &lt;b&gt;06/30/26&lt;/b&gt; &lt;b&gt; Net Assets&lt;/b&gt;&lt;/div&gt;

&lt;table style="width: 100%; border-collapse: collapse; break-inside: avoid;"&gt;

&lt;tr style="border-bottom-width: 1pt; border-bottom-style: solid; break-inside: avoid-page; height: 20pt; border-bottom-color: rgb(8, 62, 28);"&gt;
&lt;td style="break-inside: avoid-page; vertical-align: middle; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; text-align: left; padding: 6pt 3pt 3pt 3pt;"&gt;Specialized REITs&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: middle; white-space: nowrap; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; padding: 6pt 3pt 3pt 3pt;"&gt;23.65&lt;span&gt;%&lt;/span&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="border-bottom-width: 1pt; border-bottom-style: solid; break-inside: avoid-page; height: 20pt; border-bottom-color: rgb(8, 62, 28);"&gt;
&lt;td style="break-inside: avoid-page; vertical-align: middle; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; text-align: left; padding: 6pt 3pt 3pt 3pt;"&gt;Office REITs&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: middle; white-space: nowrap; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; padding: 6pt 3pt 3pt 3pt;"&gt;19.96&lt;span&gt;%&lt;/span&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="border-bottom-width: 1pt; border-bottom-style: solid; break-inside: avoid-page; height: 20pt; border-bottom-color: rgb(8, 62, 28);"&gt;
&lt;td style="break-inside: avoid-page; vertical-align: middle; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; text-align: left; padding: 6pt 3pt 3pt 3pt;"&gt;Residential REITs&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: middle; white-space: nowrap; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; padding: 6pt 3pt 3pt 3pt;"&gt;16.60&lt;span&gt;%&lt;/span&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="border-bottom-width: 1pt; border-bottom-style: solid; break-inside: avoid-page; height: 20pt; border-bottom-color: rgb(8, 62, 28);"&gt;
&lt;td style="break-inside: avoid-page; vertical-align: middle; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; text-align: left; padding: 6pt 3pt 3pt 3pt;"&gt;Industrial REITs&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: middle; white-space: nowrap; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; padding: 6pt 3pt 3pt 3pt;"&gt;12.23&lt;span&gt;%&lt;/span&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="border-bottom-width: 1pt; border-bottom-style: solid; break-inside: avoid-page; height: 20pt; border-bottom-color: rgb(8, 62, 28);"&gt;
&lt;td style="break-inside: avoid-page; vertical-align: middle; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; text-align: left; padding: 6pt 3pt 3pt 3pt;"&gt;Health Care REITs&lt;/td&gt;
&lt;td style="break-inside: avoid-page; text-align: right; vertical-align: middle; white-space: nowrap; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; padding: 6pt 3pt 3pt 3pt;"&gt;10.04&lt;span&gt;%&lt;/span&gt;&lt;/td&gt;
&lt;/tr&gt;

&lt;/table&gt;
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    <oef:PctOfNav
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      id="h_16_71e1ced7_f974_45c2_a5cf_ff6ec9474eab"
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      decimals="4"
      id="h_17_e5d9c6e3_c633_4f42_a509_f20950f82497"
      unitRef="pure">0.1996</oef:PctOfNav>
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      contextRef="TI20260630_C000009559Member_ResidentialREITsMember"
      decimals="4"
      id="h_18_da52c58d_61bc_422e_8955_ac7acf7cf044"
      unitRef="pure">0.1660</oef:PctOfNav>
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      contextRef="TI20260630_C000009559Member_IndustrialREITsMember"
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      id="h_19_81b8526c_3d19_458f_98d4_584d913e7632"
      unitRef="pure">0.1223</oef:PctOfNav>
    <oef:PctOfNav
      contextRef="TI20260630_C000009559Member_HealthCareREITsMember"
      decimals="4"
      id="h_20_5f70f78f_86cf_4048_9750_ffeb8fcc3724"
      unitRef="pure">0.1004</oef:PctOfNav>
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