Label	Element	Value
Institutional \| U.S. Core Equity 2 Portfolio [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Total Investments	oef_PctOfTotalInv	32.20%
Institutional \| DFA Selectively Hedged Global Fixed Income Portfolio [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Total Investments	oef_PctOfTotalInv	14.50%
Institutional \| International Core Equity 2 Portfolio [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Total Investments	oef_PctOfTotalInv	11.40%
Institutional \| U.S. Core Equity 1 Portfolio [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Total Investments	oef_PctOfTotalInv	10.90%
Institutional \| DFA Short-Term Extended Quality Portfolio [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Total Investments	oef_PctOfTotalInv	9.60%
Institutional \| Emerging Markets Core Equity 2 Portfolio [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Total Investments	oef_PctOfTotalInv	5.70%
Institutional \| DFA Global Core Plus Fixed Income Portfolio [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Total Investments	oef_PctOfTotalInv	4.80%
Institutional \| DFA Five-Year Global Fixed Income Portfolio [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Total Investments	oef_PctOfTotalInv	4.80%
Institutional \| DFA Inflation-Protected Securities Portfolio [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Total Investments	oef_PctOfTotalInv	2.40%
Institutional \| DFA World ex U.S. Government Fixed Income Portfolio [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Total Investments	oef_PctOfTotalInv	2.40%