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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName DIMENSIONAL INVESTMENT GROUP INC
Prospectus Date rr_ProspectusDate Feb. 28, 2019
Institutional Shares | GLOBAL ALLOCATION 25/75 PORTFOLIO  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Global Allocation 25/75 Portfolio
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The investment objective of the Global Allocation 25/75 Portfolio (the “25/75 Portfolio”) is to seek total return consistent with current income and preservation of capital with some capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Portfolio
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses you may pay if you buy and hold shares of the 25/75 Portfolio.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption <b>Shareholder Fees (fees paid directly from your investment):</b>
Operating Expenses Caption [Text] rr_OperatingExpensesCaption <b>Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)</b>
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2020
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading <b>PORTFOLIO TURNOVER</b>
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock A mutual fund generally pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when mutual fund shares are held in a taxable account. The 25/75 Portfolio does not pay transaction costs when buying and selling shares of other mutual funds managed by the Advisor (the “Underlying Funds”); however, the Underlying Funds pay transaction costs when buying and selling securities for their portfolio. The transaction costs incurred by the Underlying Funds, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the 25/75 Portfolio’s performance. During the most recent fiscal year, the 25/75 Portfolio’s portfolio turnover rate was 38% based on the weighted average portfolio turnover ratios of each of the Portfolio’s underlying investments.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 38.00%
Expense Example [Heading] rr_ExpenseExampleHeading <b>EXAMPLE</b>
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is meant to help you compare the cost of investing in the 25/75 Portfolio with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Portfolio for the time periods indicated. The Example also assumes that your investment has a 5% return each year and that the 25/75 Portfolio’s operating expenses remain the same. The costs for the Portfolio reflect the net expenses of the Portfolio that result from the contractual expense waiver in the first year only. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock To achieve its investment objective, the 25/75 Portfolio under normal market circumstances, allocates the majority of its assets to fixed income Underlying Funds, but the Portfolio also invests a small portion of its assets to domestic and international equity Underlying Funds. Generally, the 25/75 Portfolio invests its assets in domestic and international equity Underlying Funds and fixed income Underlying Funds to achieve an allocation of approximately 5% to 45% (with a target allocation of approximately 25%) of the Portfolio’s assets to domestic and international equity Underlying Funds and approximately 55% to 95% (with a target allocation of approximately 75%) of the Portfolio’s assets to fixed income Underlying Funds. Periodically the Advisor will review the allocations for the 25/75 Portfolio in each Underlying Fund and may adjust allocations to the Underlying Funds or may add or remove Underlying Funds in the Portfolio without notice to shareholders.

In addition to its allocation strategy of providing exposure to the domestic and international equity and fixed income markets through investment in the Underlying Funds, the 25/75 Portfolio further diversifies its investment portfolio by allocating its assets among Underlying Funds that represent a variety of different asset classes. As of February 28, 2019, the 25/75 Portfolio invests in: (1) fixed income Underlying Funds that may purchase U.S. and foreign debt securities such as obligations issued or guaranteed by the U.S. and foreign governments, their agencies and instrumentalities, bank obligations, commercial paper, repurchase agreements, obligations of other domestic and foreign issuers, securities of domestic or foreign issuers denominated in U.S. dollars but not trading in the United States, obligations of supranational organizations and inflation-protected securities; (2) domestic equity Underlying Funds that purchase a broad and diverse portfolio of securities of U.S. operating companies of all market capitalization sizes with an emphasis on small, value and/or high profitability companies and a domestic equity Underlying Fund that primarily invests in publicly traded REITs; and (3) international equity Underlying Funds that purchase a broad and diverse portfolio of securities of companies in developed and emerging markets of all market capitalization sizes with an emphasis on small, value and/or high profitability companies. The Underlying Funds in which the 25/75 Portfolio invests as of February 28, 2019 are described in the Portfolio’s Prospectus in the section entitled “Investments in Underlying Funds.”

The 25/75 Portfolio and each Underlying Fund may purchase or sell futures contracts and options on futures contracts, to adjust market exposure based on actual or expected cash inflows to or outflows from the Portfolio or Underlying Fund. The Portfolio and Underlying Funds do not intend to sell futures contracts to establish short positions in individual securities or to use derivatives for purposes of speculation or leveraging investment returns. Certain fixed income Underlying Funds use foreign currency forward contracts to hedge foreign currency risks, hedge against fluctuations in currency exchange rates or to transfer balances from one currency to another. In regard to currency hedging, it is generally not possible to precisely match the foreign currency exposure of such foreign currency forward contracts to the value of the securities involved due to fluctuations in the market values of such securities and cash flows into and out of the Portfolio between the date a foreign currency forward contract is entered into and the date it expires. Certain fixed income Underlying Funds also may enter into credit default swaps on issuers or indices to buy or sell credit protection to hedge credit exposure; gain market or issuer exposure without owning the underlying securities; or increase the Underlying Fund’s total return. Certain fixed income Underlying Funds also may purchase or sell futures contracts and options on futures contracts, to hedge interest rate or currency exposure or for non-hedging purposes, such as a substitute for direct investment or to adjust market exposure, including adjustments based on actual or expected cash inflows to or outflows from the Underlying Fund. Certain fixed income Underlying Funds may use derivatives to establish short positions for individual securities, markets, or currencies, in order to adjust the Underlying Fund’s duration or to replace more traditional direct investments. Also the 25/75 Portfolio and Underlying Funds may lend their portfolio securities to generate additional income.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock Because the value of your investment in the Portfolio will fluctuate, there is the risk that you will lose money. An investment in the Portfolio is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The following is a description of principal risks of investing in the Portfolio.

Fund of Funds Risk: The investment performance of the 25/75 Portfolio is affected by the investment performance of the Underlying Funds in which the Portfolio invests. The ability of the 25/75 Portfolio to achieve its investment objective depends on the ability of the Underlying Funds to meet their investment objectives and on the Advisor’s decisions regarding the allocation of the Portfolio’s assets among the Underlying Funds. The Portfolio may allocate assets to an Underlying Fund or asset class that underperforms other funds or asset classes. There can be no assurance that the investment objective of the 25/75 Portfolio or any Underlying Fund will be achieved. When the 25/75 Portfolio invests in Underlying Funds, investors are exposed to a proportionate share of the expenses of those Underlying Funds in addition to the expenses of the Portfolio. Through its investments in Underlying Funds, the 25/75 Portfolio is subject to the risks of the Underlying Funds’ investments. Certain of the risks of the 25/75 Portfolio’s and the Underlying Funds’ investments are described below.

Market Risk: Even a long-term investment approach cannot guarantee a profit. Economic, political, and issuer-specific events will cause the value of securities, and the Underlying Funds that own them, to rise or fall.

Equity Market Risk: Even a long-term investment approach cannot guarantee a profit. Economic, market, political, and issuer-specific conditions and events will cause the value of equity securities, and the Portfolio or Underlying Fund that owns them, to rise or fall. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices.

Foreign Securities and Currencies Risk: Foreign securities prices may decline or fluctuate because of: (a) economic or political actions of foreign governments, and/or (b) less regulated or liquid securities markets. Investors holding these securities may also be exposed to foreign currency risk (the possibility that foreign currency will fluctuate in value against the U.S. dollar or that a foreign government will convert, or be forced to convert, its currency to another currency, changing its value against the U.S. dollar).

Foreign Government Debt Risk: The risk that: (a) the governmental entity that controls the repayment of government debt may not be willing or able to repay the principal and/or to pay the interest when it becomes due, due to factors such as political considerations, the relative size of the governmental entity’s debt position in relation to the economy, cash flow problems, insufficient foreign currency reserves, the failure to put in place economic reforms required by the International Monetary Fund or other multilateral agencies, and/or other national economic factors; (b) governments may default on their debt securities, which may require holders of such securities to participate in debt rescheduling; and (c) there is no legal or bankruptcy process by which defaulted government debt may be collected in whole or in part.

Small Company Risk: Securities of small companies are often less liquid than those of large companies and this could make it difficult to sell a small company security at a desired time or price. As a result, small company stocks may fluctuate relatively more in price. In general, smaller capitalization companies are also more vulnerable than larger companies to adverse business or economic developments and they may have more limited resources.

Value Investment Risk: Value stocks may perform differently from the market as a whole and following a value-oriented investment strategy may cause an Underlying Fund to at times underperform equity funds that use other investment strategies.

Profitability Investment Risk: High relative profitability stocks may perform differently from the market as a whole and following a profitability-oriented strategy may cause an Underlying Fund to at times underperform equity funds that use other investment strategies.

Emerging Markets Risk: Numerous emerging market countries have a history of, and continue to experience serious, and potentially continuing, economic and political problems. Stock markets in many emerging market countries are relatively small, expensive to trade in and generally have higher risks than those in developed markets. Securities in emerging markets also may be less liquid than those in developed markets and foreigners are often limited in their ability to invest in, and withdraw assets from, these markets. Additional restrictions may be imposed under other conditions. Frontier market countries generally have smaller economies or less developed capital markets and, as a result, the risks of investing in emerging market countries are magnified in frontier market countries.

Interest Rate Risk: Fixed income securities are subject to interest rate risk because the prices of fixed income securities tend to move in the opposite direction of interest rates. When interest rates rise, fixed income security prices fall. When interest rates fall, fixed income security prices rise. In general, fixed income securities with longer maturities are more sensitive to changes in interest rates.

Credit Risk: Credit risk is the risk that the issuer of a security may be unable to make interest payments and/or repay principal when due. A downgrade to an issuer’s credit rating or a perceived change in an issuer’s financial strength may affect a security’s value, and thus, impact a fixed income Underlying Funds’ performance. Government agency obligations have different levels of credit support and, therefore, different degrees of credit risk. Securities issued by agencies and instrumentalities of the U.S. Government that are supported by the full faith and credit of the United States, such as the Federal Housing Administration and Ginnie Mae, present little credit risk. Other securities issued by agencies and instrumentalities sponsored by the U.S. Government, that are supported only by the issuer’s right to borrow from the U.S. Treasury, subject to certain limitations, and securities issued by agencies and instrumentalities sponsored by the U.S. Government that are sponsored by the credit of the issuing agencies, such as Freddie Mac and Fannie Mae, are subject to a greater degree of credit risk. U.S. government agency securities issued or guaranteed by the credit of the agency may still involve a risk of non-payment of principal and/or interest.

Income Risk: Income risk is the risk that falling interest rates will cause a fixed income Underlying Funds’ income to decline because, among other reasons, the proceeds from maturing short-term securities in its portfolio may be reinvested in lower-yielding securities.

Derivatives Risk: Derivatives are instruments, such as futures, and options thereon, and foreign currency forward contracts, whose value is derived from that of other assets, rates or indices. Derivatives can be used for hedging (attempting to reduce risk by offsetting one investment position with another) or non-hedging purposes. Hedging with derivatives may increase expenses, and there is no guarantee that a hedging strategy will work. While hedging can reduce or eliminate losses, it can also reduce or eliminate gains or cause losses if the market moves in a manner different from that anticipated by the Portfolio or if the cost of the derivative outweighs the benefit of the hedge. The use of derivatives for non-hedging purposes may be considered to carry more risk than other types of investments. When the 25/75 Portfolio or an Underlying Fund uses derivatives, the Portfolio or Underlying Fund will be directly exposed to the risks of those derivatives. Derivative instruments are subject to a number of risks including counterparty, liquidity, interest rate, market, credit and management risks, as well as the risk of improper valuation. Changes in the value of a derivative may not correlate perfectly with the underlying asset, rate or index, and the Portfolio or Underlying Fund could lose more than the principal amount invested. Additional risks are associated with the use of credit default swaps including counterparty and credit risk (the risk that the other party to a swap agreement will not fulfill its contractual obligations, whether because of bankruptcy or other default) and liquidity risk (the possible lack of a secondary market for the swap agreement). Credit risk increases when the Portfolio or Underlying Fund is the seller of credit default swaps and counterparty risk increases when the Portfolio or Underlying Fund is a buyer of credit default swaps. In addition, where the Portfolio or Underlying Fund is the seller of credit default swaps, it may be required to liquidate portfolio securities at inopportune times in order to meet payment obligations or segregation requirements. Credit default swaps may be illiquid or difficult to value.

Liquidity Risk: Liquidity risk exists when particular portfolio investments are difficult to purchase or sell. To the extent that a fixed income Underlying Fund holds illiquid investments, the fixed income Underlying Fund’s performance may be reduced due to an inability to sell the investments at opportune prices or times. Liquid portfolio investments may become illiquid or less liquid after purchase by a fixed income Underlying Fund due to low trading volume, adverse investor perceptions and/or other market developments. Liquidity risk includes the risk that a fixed income Underlying Fund will experience significant net redemptions at a time when it cannot find willing buyers for its portfolio securities or can only sell its portfolio securities at a material loss. Liquidity risk can be more pronounced in periods of market turmoil.

Securities Lending Risk: Securities lending involves the risk that the borrower may fail to return the securities in a timely manner or at all. As a result, the Underlying Funds may lose money and there may be a delay in recovering the loaned securities. The Underlying Funds could also lose money if they do not recover the securities and/or the value of the collateral falls, including the value of investments made with cash collateral. Securities lending also may have certain adverse tax consequences. To the extent that the Portfolio holds securities directly and lends those securities, it will be also subject to the foregoing risks with respect to its loaned securities.

Cyber Security Risk: The 25/75 Portfolio’s and its service providers’ use of internet, technology and information systems may expose the Portfolio to potential risks linked to cyber security breaches of those technological or information systems. Cyber security breaches, amongst other things, could allow an unauthorized party to gain access to proprietary information, customer data, or fund assets, or cause the Portfolio and/or its service providers to suffer data corruption or lose operational functionality.

Other risks of the Underlying Funds are described in the 25/75 Portfolio’s prospectus in the section entitled “Additional Risks of the Underlying Funds.”
Risk Lose Money [Text] rr_RiskLoseMoney Because the value of your investment in the Portfolio will fluctuate, there is the risk that you will lose money.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Portfolio is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The bar chart and table immediately following illustrate the variability of the 25/75 Portfolio’s returns and are meant to provide some indication of the risks of investing in the Portfolio. The bar chart shows the changes in the 25/75 Portfolio’s performance from year to year. The table illustrates how annualized one year, five year and ten year returns, both before and after taxes, compare with those of a broad measure of market performance. The 25/75 Portfolio’s past performance (before and after taxes) is not an indication of future results. Updated performance information for the 25/75 Portfolio can be obtained by visiting http://us.dimensional.com.

The after-tax returns presented in the table for the 25/75 Portfolio are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown in the table. In addition, the after-tax returns shown are not relevant to investors who hold shares of the 25/75 Portfolio through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table immediately following illustrate the variability of the 25/75 Portfolio’s returns and are meant to provide some indication of the risks of investing in the Portfolio. The bar chart shows the changes in the 25/75 Portfolio’s performance from year to year.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Global 25/75 Composite Index (MSCI/FTSE) is an unmanaged hypothetical index composed of 25% MSCI World Index (net dividends) and 75% FTSE World Government Bond Index, 1-3 Years, Currency-Hedged in USD Terms.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress http://us.dimensional.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The 25/75 Portfolio’s past performance (before and after taxes) is not an indication of future results.
Bar Chart [Heading] rr_BarChartHeading <b>Global Allocation 25/75 Portfolio Institutional Class Shares—Total Returns </b>
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock January 2009-December 2018

Highest Quarter    Lowest Quarter
7.36% (4/09–6/09)
    -4.20% (7/11–9/11)
Performance Table Heading rr_PerformanceTableHeading <b>Annualized Returns (%)</b><br/>Periods ending December 31, 2018
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns presented in the table for the 25/75 Portfolio are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred In addition, the after-tax returns shown are not relevant to investors who hold shares of the 25/75 Portfolio through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts.
Institutional Shares | GLOBAL ALLOCATION 25/75 PORTFOLIO | Institutional Class  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther none
Management Fee rr_ManagementFeesOverAssets 0.20%
Other Expenses rr_OtherExpensesOverAssets 0.02%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.20%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.42%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.16% [1]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.26%
1 Year rr_ExpenseExampleYear01 $ 27
3 Years rr_ExpenseExampleYear03 119
5 Years rr_ExpenseExampleYear05 219
10 Years rr_ExpenseExampleYear10 514
1 Year rr_ExpenseExampleNoRedemptionYear01 27
3 Years rr_ExpenseExampleNoRedemptionYear03 119
5 Years rr_ExpenseExampleNoRedemptionYear05 219
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 514
2009 rr_AnnualReturn2009 13.88%
2010 rr_AnnualReturn2010 8.12%
2011 rr_AnnualReturn2011 1.63%
2012 rr_AnnualReturn2012 7.00%
2013 rr_AnnualReturn2013 5.85%
2014 rr_AnnualReturn2014 2.60%
2015 rr_AnnualReturn2015 (0.27%)
2016 rr_AnnualReturn2016 4.97%
2017 rr_AnnualReturn2017 6.64%
2018 rr_AnnualReturn2018 (1.85%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 7.36%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (4.20%)
1 Year rr_AverageAnnualReturnYear01 (1.85%)
5 Years rr_AverageAnnualReturnYear05 2.37%
10 Years rr_AverageAnnualReturnYear10 4.77%
Institutional Shares | GLOBAL ALLOCATION 25/75 PORTFOLIO | Return After Taxes on Distributions | Institutional Class  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (2.87%)
5 Years rr_AverageAnnualReturnYear05 1.61%
10 Years rr_AverageAnnualReturnYear10 4.04%
Institutional Shares | GLOBAL ALLOCATION 25/75 PORTFOLIO | Return After Taxes on Distributions and Sale of Portfolio Shares | Institutional Class  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (0.95%)
5 Years rr_AverageAnnualReturnYear05 1.55%
10 Years rr_AverageAnnualReturnYear10 3.52%
Institutional Shares | GLOBAL ALLOCATION 25/75 PORTFOLIO | MSCI World Index (net dividends) (reflects no deduction for fees, expenses, or taxes on sales)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (8.71%)
5 Years rr_AverageAnnualReturnYear05 4.56%
10 Years rr_AverageAnnualReturnYear10 9.67%
Institutional Shares | GLOBAL ALLOCATION 25/75 PORTFOLIO | FTSE World Government Bond Index, 1-3 Years, Currency-Hedged in USD Terms (reflects no deduction for fees, expenses, or taxes on sales)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.06%
5 Years rr_AverageAnnualReturnYear05 1.16%
10 Years rr_AverageAnnualReturnYear10 1.28%
Institutional Shares | GLOBAL ALLOCATION 25/75 PORTFOLIO | Global 25/75 Composite Index (MSCI/FTSE) (reflects no deduction for fees, expenses, or taxes on sales)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (0.56%) [2]
5 Years rr_AverageAnnualReturnYear05 2.12% [2]
10 Years rr_AverageAnnualReturnYear10 3.52% [2]
[1] Dimensional Fund Advisors LP (the “Advisor”) has agreed to waive certain fees of the Portfolio. The Fee Waiver Agreement for the Portfolio will remain in effect through February 28, 2020, and may only be terminated by the Fund’s Board of Directors prior to that date. Under certain circumstances, the Advisor retains the right to seek reimbursement for any fees previously waived up to thirty-six months after such fee waiver.
[2] The Global 25/75 Composite Index (MSCI/FTSE) is an unmanaged hypothetical index composed of 25% MSCI World Index (net dividends) and 75% FTSE World Government Bond Index, 1-3 Years, Currency-Hedged in USD Terms.