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ck0000804239:S000035779Member ck0000804239:C000109624Member 2012-09-30 2012-09-30 0000804239 ck0000804239:C000109625Member ck0000804239:S000035780Member 2012-09-30 2012-09-30 0000804239 ck0000804239:C000109625Member ck0000804239:S000035780Member ck0000804239:C000109625Member 2012-09-30 2012-09-30 0000804239 ck0000804239:C000109626Member ck0000804239:S000035781Member 2012-09-30 2012-09-30 0000804239 ck0000804239:C000109626Member ck0000804239:S000035781Member ck0000804239:C000109626Member 2012-09-30 2012-09-30 0000804239 ck0000804239:C000109627Member ck0000804239:S000035782Member 2012-09-30 2012-09-30 0000804239 ck0000804239:C000109627Member ck0000804239:S000035782Member ck0000804239:C000109627Member 2012-09-30 2012-09-30 iso4217:USD xbrli:pure The Fund incurred Acquired Fund Fees and Expenses (AFFE) during the most recent fiscal year, and therefore the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus). The financial statements include only the direct operating expenses incurred by the Fund, not the indirect costs of investing in other investment companies. The Fund's actual inception date is April 20, 1987. Between April 20, 1987 and October 3, 1994, the Fund was advised by a different investment adviser. Accordingly, performance shown in the chart above is from October 3, 1994. Index returns are shown from October 31, 1994. The the Fund incurred Acquired Fund Fees and Expenses (AFFE) during the most recent fiscal year, and therefore the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus). The financial statements include only the direct operating expenses incurred by the Fund, not the indirect costs of investing in other investment companies. Index returns are shown from December 31, 1994. Index returns are shown from March 31, 1998. The Fund commenced operations on September 17, 2007. The performance information prior to September 17, 2007 is based on the performance of the Former S&P 500 Index Fund. Index returns are shown from February 29, 1996. Index returns are shown from April 30, 1992. Index returns are shown from October 31, 2000. The Fund incurred AFFE during the most recent fiscal year, and therefore the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus). The financial statements include only the direct operating expenses incurred by the Fund, not the indirect costs of investing in other investment companies. Index returns are shown from February 28, 1993. Index returns are shown from October 31, 2004. Index returns are shown from July 31, 2006. Index returns are shown from December 31, 2007. Index returns are shown from November 30, 2003. Index returns are shown from May 31, 1987. Index returns are shown from July 31, 2009. The Fund incurred AFFE during the most recent fiscal year, and therefore operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus). The financial statements include only the direct operating expenses incurred by the Fund, not the indirect costs of investing in other investment companies. The BofA Merrill Lynch U.S. High Yield Constrained Index Return for the "Since Inception" period is not provided since returns for the index are not available prior to 1996. The Fund incurred AFFE during the most recent fiscal year, and therefore the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus) because the financial statements include only the direct operating expenses incurred by the Fund, not the indirect costs of investing in other investment companies. Index returns are shown from October 31, 1994. Index returns are shown from December 31, 1994. The Fund commenced operations on September 17, 2007. The performance information prior to September 17, 2007 is based on the performance of the Former S&P 500 Index Fund's Class A Shares (prior to June 28, 2002) and Class I Shares (between June 28, 2002 and September 16, 2007). Index returns are shown from April 30, 1992. The Fund incurred AFFE during the most recent fiscal year, and therefore the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus). The financial statements include only the direct operating expenses incurred by the Fund, not the indirect costs of investing in other investment companies. Index returns are shown from May 31, 1987. Index returns are shown from July 31, 2009. Index returns are shown from March 31, 1998. Other expenses are based on estimated amounts for the current fiscal year. SEI Investments Global Funds Services has contractually agreed to waive fees and to reimburse expenses in order to keep total operating expenses, exclusive of interest from borrowings, brokerage, commissions, taxes, trustee fees and extraordinary expenses not incurred in the ordinary course of the Fund's business and net of the Fund's distributor's fee waivers, from exceeding 0.44%. This fee waiver and reimbursement agreement shall remain in effect until January 31, 2014 and, unless earlier terminated, shall be automatically renewed for successive one year periods thereafter. The agreement may be amended or terminated only with the consent of the Board of Trustees. SEI INSTITUTIONAL MANAGED TRUST 485BPOS false 0000804239 2012-09-30 2013-01-28 2013-01-31 2013-01-31 SIMT Large Cap Fund Principal Investment Strategies Under normal circumstances, the Large Cap Fund will invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in equity securities of large companies. For purposes of this Fund, a large company is a company with a market capitalization in the range of companies in the Russell 1000 Index (between $317.20 million and $499.80 billion as of December 31, 2012) at the time of purchase. The market capitalization range and the composition of the Russell 1000 Index are subject to change. These securities may include common stocks, preferred stocks, warrants, American depositary receipts (ADRs) and exchange-traded funds (ETFs). The Fund may also, to a lesser extent, invest in common and preferred stocks of small capitalization companies. The Fund may invest up to 20% of its assets in foreign securities. The Fund uses a multi-manager approach, relying on a number of sub-advisers (each, a Sub-Adviser and collectively, the Sub-Advisers) with differing investment philosophies and strategies to manage portions of the Fund's portfolio under the general supervision of SEI Investments Management Corporation (SIMC), the Fund's adviser. In managing its portion of the Fund's assets, each Sub-Adviser generally applies either a growth-oriented, a value-oriented or a blended approach to selecting investments. Growth oriented managers generally select stocks they believe have attractive growth and appreciation potential in light of such characteristics as revenue and earnings growth, expectations from sell-side analysts and relative valuation, while value-oriented managers generally select stocks they believe are attractively valued in light of fundamental characteristics such as earnings, capital structure and/or return on invested capital. Principal Risks Currency Risk — As a result of the Fund's investments in securities or other investments denominated in, and/or receiving revenues in, foreign currencies, the Fund will be subject to currency risk. Currency risk is the risk that foreign currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency hedged. In either event, the dollar value of an investment in the Fund would be adversely affected. Depositary Receipts Risk — Depositary receipts, such as ADRs, are certificates evidencing ownership of shares of a foreign issuer that are issued by depositary banks and generally trade on an established market. Depositary receipts are subject to many of the risks associated with investing directly in foreign securities, including, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. Equity Market Risk — The risk that stock prices will fall over short or extended periods of time. Exchange-Traded Funds (ETFs) Risk — The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the ETF is designed to track, although lack of liquidity in an ETF could result in its value being more volatile than the underlying portfolio securities. Foreign Investment Risk — The risk that non-U.S. securities may be subject to additional risks due to, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. Investment Style Risk — The risk that large capitalization securities may underperform other segments of the equity markets or the equity markets as a whole. Leverage Risk — The use of leverage can amplify the effects of market volatility on the Fund's share price and may also cause the Fund to liquidate portfolio positions when it would not be advantageous to do so in order to satisfy its obligations. Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the Fund would like. The Fund may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance. Portfolio Turnover Risk — Due to its investment strategy, the Fund may buy and sell securities frequently. This may result in higher transaction costs and additional capital gains tax liabilities. Short Sales Risk — A short sale involves the sale of a security that the Fund does not own in the expectation of purchasing the same security (or a security exchangeable therefore) at a later date at a lower price. Short sales expose the Fund to the risk that it will be required to buy the security sold short (also known as "covering" the short position) at a time when the security has appreciated in value, thus resulting in a loss to the Fund. Investment in short sales may also cause the Fund to incur expenses related to borrowing securities. Reinvesting proceeds received from short selling may create leverage, which can amplify the effects of market volatility on the Fund's share price. Small Capitalization Risk — Smaller capitalization companies in which the Fund invests may be more vulnerable to adverse business or economic events than larger, more established companies. In particular, small capitalization companies may have limited product lines, markets and financial resources and may depend upon a relatively small management group. Therefore, small capitalization stocks may be more volatile than those of larger companies. Small capitalization stocks may be traded over-the-counter or listed on an exchange. Loss of money is a risk of investing in the Fund. Loss of money is a risk of investing in the Fund. Investment Goal Long-term growth of capital and income. EXAMPLE This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. 105 328 569 1259 ~ http://seic.com/20130128/role/ScheduleExpenseExampleTransposed20003 column dei_LegalEntityAxis compact ck0000804239_S000026000Member row primary compact * ~ Although your actual costs may be higher or lower, based on these assumptions your costs would be: PORTFOLIO TURNOVER The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 50% of the average value of its portfolio. 0.50 Fees and Expenses This table describes the fees and expenses that you may pay if you buy and hold Fund shares. -0.0050 0.0039 0.0000 0.0064 0.0103 ~ http://seic.com/20130128/role/ScheduleShareholderFees20001 column dei_LegalEntityAxis compact ck0000804239_S000026000Member row primary compact * ~ ~ http://seic.com/20130128/role/ScheduleAnnualFundOperatingExpenses20002 column dei_LegalEntityAxis compact ck0000804239_S000026000Member row primary compact * ~ ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) The Fund incurred Acquired Fund Fees and Expenses (AFFE) during the most recent fiscal year, and therefore the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus). SHAREHOLDER FEES (fees paid directly from your investment) Performance Information The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for each calendar year since inception and by showing how the Fund's average annual returns for 1 year and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. For current performance information, please call 1-800-DIAL-SEI. 0.1326 -0.0013 0.1615 ~ http://seic.com/20130128/role/ScheduleAnnualTotalReturnsBarChart20004 column dei_LegalEntityAxis compact ck0000804239_S000026000Member row primary compact * ~ Best Quarter: 0.1391 2012-03-31 -15.19% (09/30/11) -0.1519 2011-09-30 Best Quarter: 13.91% (03/31/12) Worst Quarter: -15.19% (09/30/11) Average Annual Total Returns (for the periods ended December 31, 2012) After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. 0.1615 0.1072 Class A Return Before Taxes 0.1496 0.0954 Class A Return After Taxes on Distributions 0.1180 0.0893 Class A Return After Taxes on Distributions and Sale of Fund Shares 0.1642 0.1224 Russell 1000 Index Return (reflects no deduction for fees, expenses or taxes) 2009-09-30 2009-09-30 ~ http://seic.com/20130128/role/ScheduleAverageAnnualReturnsTransposed20005 column dei_LegalEntityAxis compact ck0000804239_S000026000Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for each calendar year since inception and by showing how the Fund's average annual returns for 1 year and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. (reflects no deduction for fees, expenses or taxes) 1-800-DIAL-SEI Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. SIMT LARGE CAP VALUE FUND TRMVX Principal Investment Strategies Under normal circumstances, the Large Cap Value Fund will invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in equity securities of large companies, including American depositary receipts (ADRs) and exchange-traded funds (ETFs). For purposes of this Fund, a large company is a company with a market capitalization in the range of companies in the Russell 1000 Value Index (between $317.20 million and $394.60 billion as of December 31, 2012) at the time of purchase. The market capitalization range and the composition of the Russell 1000 Value Index are subject to change. The Fund may also, to a lesser extent, invest in common and preferred stocks of small capitalization companies. The Fund may invest up to 20% of its assets in foreign securities. The Fund uses a multi-manager approach, relying on a number of sub-advisers (each, a Sub-Adviser and collectively, the Sub-Advisers) with differing investment philosophies to manage portions of the Fund's portfolio under the general supervision of SEI Investments Management Corporation (SIMC), the Fund's adviser. In managing its portion of the Fund's assets, each Sub-Adviser selects stocks they believe are attractively valued in light of fundamental characteristics such as earnings, capital structure and/or return on invested capital. Principal Risks Depositary Receipts Risk — Depositary receipts, such as ADRs, are certificates evidencing ownership of shares of a foreign issuer that are issued by depositary banks and generally trade on an established market. Depositary receipts are subject to many of the risks associated with investing directly in foreign securities, including, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. Equity Market Risk — The risk that stock prices will fall over short or extended periods of time. Exchange-Traded Funds (ETFs) Risk — The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the ETF is designed to track, although lack of liquidity in an ETF could result in its value being more volatile than the underlying portfolio securities. Foreign Investment Risk — The risk that non-U.S. securities may be subject to additional risks due to, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. Investment Style Risk — The risk that large capitalization securities may underperform other segments of the equity markets or the equity markets as a whole. Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the Fund would like. The Fund may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance. Small Capitalization Risk — Smaller capitalization companies in which the Fund invests may be more vulnerable to adverse business or economic events than larger, more established companies. In particular, small capitalization companies may have limited product lines, markets and financial resources and may depend upon a relatively small management group. Therefore, small capitalization stocks may be more volatile than those of larger companies. Small capitalization stocks may be traded over-the-counter or listed on an exchange. Loss of money is a risk of investing in the Fund. Loss of money is a risk of investing in the Fund. Investment Goal Long-term growth of capital and income. EXAMPLE This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. 101 315 547 1213 ~ http://seic.com/20130128/role/ScheduleExpenseExampleTransposed20010 column dei_LegalEntityAxis compact ck0000804239_S000006674Member row primary compact * ~ Although your actual costs may be higher or lower, based on these assumptions your costs would be: PORTFOLIO TURNOVER The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 37% of the average value of its portfolio. 0.37 Fees and Expenses This table describes the fees and expenses that you may pay if you buy and hold Fund shares. -0.0050 0.0035 0.0000 0.0064 0.0099 ~ http://seic.com/20130128/role/ScheduleShareholderFees20008 column dei_LegalEntityAxis compact ck0000804239_S000006674Member row primary compact * ~ ~ http://seic.com/20130128/role/ScheduleAnnualFundOperatingExpenses20009 column dei_LegalEntityAxis compact ck0000804239_S000006674Member row primary compact * ~ ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) The Fund incurred Acquired Fund Fees and Expenses (AFFE) during the most recent fiscal year, and therefore the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus). SHAREHOLDER FEES (fees paid directly from your investment) Performance Information The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. For current performance information, please call 1-800-DIAL-SEI. 0.2945 0.1506 0.0719 0.2115 -0.0177 -0.3705 0.1861 0.1455 -0.0009 0.1600 ~ http://seic.com/20130128/role/ScheduleAnnualTotalReturnsBarChart20011 column dei_LegalEntityAxis compact ck0000804239_S000006674Member row primary compact * ~ Best Quarter: 0.1714 2003-06-30 Worst Quarter: -0.2073 2008-12-31 Best Quarter: 17.14% (06/30/03) Worst Quarter: -20.73% (12/31/08) Average Annual Total Returns (for the periods ended December 31, 2012) After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. 0.1600 -0.0018 0.0653 0.0808 Class A Return Before Taxes 0.1574 -0.0045 0.0584 0.0686 Class A Return After Taxes on Distributions 0.1073 -0.0020 0.0568 0.0668 Class A Return After Taxes on Distributions and Sale of Fund Shares 0.1751 0.0059 0.0738 0.0898 Russell 1000 Value Index Return (reflects no deduction for fees, expenses or taxes) 1994-10-03 1994-10-31 ~ http://seic.com/20130128/role/ScheduleAverageAnnualReturnsTransposed20012 column dei_LegalEntityAxis compact ck0000804239_S000006674Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. (reflects no deduction for fees, expenses or taxes) 1-800-DIAL-SEI Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. SIMT LARGE CAP GROWTH FUND SELCX Principal Investment Strategies Under normal circumstances, the Large Cap Growth Fund will invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in equity securities of large companies, including American depositary receipts (ADRs) and exchange-traded funds (ETFs). For purposes of this Fund, a large company is a company with a market capitalization in the range of companies in the Russell 1000 Growth Index (between $336.60 million and $499.80 billion as of December 31, 2012) at the time of purchase. The market capitalization range and the composition of the Russell 1000 Growth Index are subject to change. The Fund may also, to a lesser extent, invest in common and preferred stocks of small capitalization companies. The Fund may invest up to 20% of its assets in foreign securities. The Fund uses a multi-manager approach, relying on a number of sub-advisers (each, a Sub-Adviser and collectively, the Sub-Advisers) with differing investment approaches to manage portions of the Fund's portfolio under the general supervision of SEI Investments Management Corporation (SIMC), the Fund's adviser. In managing its portion of the Fund's assets, each Sub-Adviser selects stocks they believe have attractive growth and appreciation potential in light of such characteristics as revenue and earnings growth, expectations from sell-side analysts and relative valuation. Principal Risks Depositary Receipts Risk — Depositary receipts, such as ADRs, are certificates evidencing ownership of shares of a foreign issuer that are issued by depositary banks and generally trade on an established market. Depositary receipts are subject to many of the risks associated with investing directly in foreign securities, including, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. Equity Market Risk — The risk that stock prices will fall over short or extended periods of time. Exchange-Traded Funds (ETFs) Risk — The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the ETF is designed to track, although lack of liquidity in an ETF could result in its value being more volatile than the underlying portfolio securities. Foreign Investment Risk — The risk that non-U.S. securities may be subject to additional risks due to, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. Investment Style Risk — The risk that large capitalization securities may underperform other segments of the equity markets or the equity markets as a whole. Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the Fund would like. The Fund may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance. Portfolio Turnover Risk — Due to its investment strategy, the Fund may buy and sell securities frequently. This may result in higher transaction costs and additional capital gains tax liabilities. Small Capitalization Risk — Smaller capitalization companies in which the Fund invests may be more vulnerable to adverse business or economic events than larger, more established companies. In particular, small capitalization companies may have limited product lines, markets and financial resources and may depend upon a relatively small management group. Therefore, small capitalization stocks may be more volatile than those of larger companies. Small capitalization stocks may be traded over-the-counter or listed on an exchange. Loss of money is a risk of investing in the Fund. Loss of money is a risk of investing in the Fund. Investment Goal Capital appreciation. EXAMPLE This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. 106 331 574 1271 ~ http://seic.com/20130128/role/ScheduleExpenseExampleTransposed20017 column dei_LegalEntityAxis compact ck0000804239_S000006671Member row primary compact * ~ Although your actual costs may be higher or lower, based on these assumptions your costs would be: PORTFOLIO TURNOVER The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 88% of the average value of its portfolio. 0.88 Fees and Expenses This table describes the fees and expenses that you may pay if you buy and hold Fund shares. -0.0050 0.0040 0.0000 0.0064 0.0104 ~ http://seic.com/20130128/role/ScheduleShareholderFees20015 column dei_LegalEntityAxis compact ck0000804239_S000006671Member row primary compact * ~ ~ http://seic.com/20130128/role/ScheduleAnnualFundOperatingExpenses20016 column dei_LegalEntityAxis compact ck0000804239_S000006671Member row primary compact * ~ ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) The the Fund incurred Acquired Fund Fees and Expenses (AFFE) during the most recent fiscal year, and therefore the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus). SHAREHOLDER FEES (fees paid directly from your investment) Performance Information The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. For current performance information, please call 1-800-DIAL-SEI. 0.2533 0.0757 0.0681 0.0694 0.1223 -0.4089 0.3765 0.1496 0.0062 0.1605 ~ http://seic.com/20130128/role/ScheduleAnnualTotalReturnsBarChart20018 column dei_LegalEntityAxis compact ck0000804239_S000006671Member row primary compact * ~ Best Quarter: 0.1634 2009-06-30 Worst Quarter: -0.2418 2008-12-31 Best Quarter: 16.34% (06/30/09) Worst Quarter: -24.18% (12/31/08) Average Annual Total Returns (for the periods ended December 31, 2012) After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. 0.1605 0.0178 0.0656 0.0689 Class A Return Before Taxes 0.1600 0.0171 0.0651 0.0646 Class A Return After Taxes on Distributions 0.1050 0.0150 0.0577 0.0598 Class A Return After Taxes on Distributions and Sale of Fund Shares 0.1526 0.0312 0.0752 0.0761 Russell 1000 Growth Index Return (reflects no deduction for fees, expenses or taxes) 1994-12-20 1994-12-31 ~ http://seic.com/20130128/role/ScheduleAverageAnnualReturnsTransposed20019 column dei_LegalEntityAxis compact ck0000804239_S000006671Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. (reflects no deduction for fees, expenses or taxes) 1-800-DIAL-SEI Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. SIMT TAX-MANAGED LARGE CAP FUND TMLCX Principal Investment Strategies Under normal circumstances, the Tax-Managed Large Cap Fund will invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in equity securities of large companies, including American depositary receipts (ADRs) and exchange-traded funds (ETFs). For purposes of this Fund, a large company is a company with a market capitalization in the range of companies in the Russell 1000 Index (between $317.20 million and $499.80 billion as of December 31, 2012) at the time of purchase. The market capitalization range and the composition of the Russell 1000 Index are subject to change. The Fund may also, to a lesser extent, invest in common and preferred stocks of small capitalization companies. The Fund may invest up to 20% of its assets in foreign securities. The Fund uses a multi-manager approach, relying upon a number of sub-advisers (each, a Sub-Adviser and collectively, the Sub-Advisers) to manage portions of the Fund's portfolio under the general supervision of SEI Investments Management Corporation (SIMC), the Fund's adviser. In managing its portion of the Fund's assets, each Sub-Adviser generally applies a growth-oriented, a value-oriented or a blended approach to selecting investments. Growth oriented managers generally select stocks they believe have attractive growth and appreciation potential in light of such characteristics as revenue and earnings growth, expectations from sell-side analysts and relative valuation, while value-oriented managers generally select stocks they believe are attractively valued in light of fundamental characteristics such as earnings, capital structure and/or return on invested capital. The Fund seeks to manage the impact of taxes through the use of a Sub-Adviser that acts as an overlay manager implementing the portfolio recommendations of the Sub-Advisers. Each Sub-Adviser provides a model portfolio to the Fund on an ongoing basis that represents that Sub-Adviser's recommendation as to the securities to be purchased, sold or retained by the Fund. The overlay manager constructs a portfolio for the Fund that represents the aggregation of the model portfolios of the other Sub-Advisers, with the weighting of each Sub-Adviser's model in the total portfolio determined by SIMC. The overlay manager implements the portfolio consistent with that represented by the aggregation of the model portfolios, with limited authority to vary from such aggregation, primarily for the purpose of seeking efficient tax management of the Fund's securities transactions. The overlay manager may also, to a lesser extent, deviate from such aggregation for the purposes of risk management and transaction cost management. The overlay manager seeks to manage the impact of taxes by, among other things, selling stocks with the highest tax cost first, opportunistically harvesting losses and deferring recognition of taxable gains, where possible. Principal Risks Depositary Receipts Risk — Depositary receipts, such as ADRs, are certificates evidencing ownership of shares of a foreign issuer that are issued by depositary banks and generally trade on an established market. Depositary receipts are subject to many of the risks associated with investing directly in foreign securities, including, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. Equity Market Risk — The risk that stock prices will fall over short or extended periods of time. Exchange-Traded Funds (ETFs) Risk — The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the ETF is designed to track, although lack of liquidity in an ETF could result in its value being more volatile than the underlying portfolio securities. Foreign Investment Risk — The risk that non-U.S. securities may be subject to additional risks due to, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. Investment Style Risk — The risk that large capitalization securities may underperform other segments of the equity markets or the equity markets as a whole. Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the Fund would like. The Fund may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance. Small Capitalization Risk — Smaller capitalization companies in which the Fund invests may be more vulnerable to adverse business or economic events than larger, more established companies. In particular, small capitalization companies may have limited product lines, markets and financial resources and may depend upon a relatively small management group. Therefore, small capitalization stocks may be more volatile than those of larger companies. Small capitalization stocks may be traded over-the-counter or listed on an exchange. Taxation Risk — The Fund is managed to minimize tax consequences to investors, but will likely earn taxable income and gains from time to time. Loss of money is a risk of investing in the Fund. Loss of money is a risk of investing in the Fund. Investment Goal High long-term after-tax returns. EXAMPLE This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. 105 328 569 1259 ~ http://seic.com/20130128/role/ScheduleExpenseExampleTransposed20024 column dei_LegalEntityAxis compact ck0000804239_S000006676Member row primary compact * ~ Although your actual costs may be higher or lower, based on these assumptions your costs would be: PORTFOLIO TURNOVER The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 53% of the average value of its portfolio. 0.53 Fees and Expenses This table describes the fees and expenses that you may pay if you buy and hold Fund shares. -0.0050 0.0040 0.0000 0.0063 0.0103 ~ http://seic.com/20130128/role/ScheduleShareholderFees20022 column dei_LegalEntityAxis compact ck0000804239_S000006676Member row primary compact * ~ ~ http://seic.com/20130128/role/ScheduleAnnualFundOperatingExpenses20023 column dei_LegalEntityAxis compact ck0000804239_S000006676Member row primary compact * ~ ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) SHAREHOLDER FEES (fees paid directly from your investment) Performance Information The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. For current performance information, please call 1-800-DIAL-SEI. 0.2781 0.1150 0.0684 0.1390 0.0583 -0.3938 0.2892 0.1370 0.0043 0.1635 ~ http://seic.com/20130128/role/ScheduleAnnualTotalReturnsBarChart20025 column dei_LegalEntityAxis compact ck0000804239_S000006676Member row primary compact * ~ Best Quarter: 0.1735 2009-06-30 -23.05% (12/31/08) -0.2305 2008-12-31 Best Quarter: 17.35% (06/30/09) Worst Quarter: -23.05% (12/31/08) Average Annual Total Returns (for the periods ended December 31, 2012) After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. 0.1635 0.0075 0.0666 0.0320 Class A Return Before Taxes 0.1615 0.0058 0.0649 0.0300 Class A Return After Taxes on Distributions 0.1089 0.0061 0.0584 0.0271 Class A Return After Taxes on Distributions and Sale of Fund Shares 0.1642 0.0192 0.0752 0.0394 Russell 1000 Index Return (reflects no deduction for fees, expenses or taxes) 1998-03-31 1998-03-05 ~ http://seic.com/20130128/role/ScheduleAverageAnnualReturnsTransposed20026 column dei_LegalEntityAxis compact ck0000804239_S000006676Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. (reflects no deduction for fees, expenses or taxes) 1-800-DIAL-SEI Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. SIMT S&P 500 Index Fund Principal Investment Strategies The S&P 500 Index Fund invests substantially all of its assets in securities listed in the S&P 500 Index, which is composed of approximately 500 leading U.S. publicly traded companies from a broad range of industries (mostly common stocks). The Fund generally gives the same weight to a given stock as the S&P 500 Index does. In seeking to replicate the performance of the S&P 500 Index, the Fund may also invest in American depositary receipts (ADRs), exchange-traded funds (ETFs) and real estate investment trusts (REITs). The Fund may invest a portion of its assets in securities of companies located in developed foreign countries and securities of small capitalization companies. The Fund's ability to replicate the performance of the S&P 500 Index will depend to some extent on the size and timing of cash flows into and out of the Fund, as well as on the level of the Fund's expenses. The Fund's sub-adviser (the Sub-Adviser) selects the Fund's securities under the general supervision of SEI Investments Management Corporation (SIMC), the Fund's adviser, but the Sub-Adviser makes no attempt to "manage" the Fund in the traditional sense (i.e., by using economic, market or financial analyses). Instead, the Sub-Adviser purchases a basket of securities that includes most of the companies in the S&P 500 Index. However, the Sub-Adviser may sell an investment if the merit of the investment has been substantially impaired by extraordinary events or adverse financial conditions. Principal Risks Depositary Receipts Risk — Depositary receipts, such as ADRs, are certificates evidencing ownership of shares of a foreign issuer that are issued by depositary banks and generally trade on an established market. Depositary receipts are subject to many of the risks associated with investing directly in foreign securities, including, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. Equity Market Risk — The risk that stock prices will fall over short or extended periods of time. Exchange-Traded Funds (ETFs) Risk — The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the ETF is designed to track, although lack of liquidity in an ETF could result in its value being more volatile than the underlying portfolio securities. Foreign Investment Risk — The risk that non-U.S. securities may be subject to additional risks due to, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. Investment Style Risk — The risk that the Fund's investment approach, which attempts to replicate the performance of the S&P 500 Index, may underperform other segments of the equity markets or the equity markets as a whole. Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the Fund would like. The Fund may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance. REITs Risk — REITs are trusts that invest primarily in commercial real estate or real estate-related loans. The Fund's investments in REITs will be subject to the risks associated with the direct ownership of real estate. Risks commonly associated with the direct ownership of real estate include fluctuations in the value of underlying properties, defaults by borrowers or tenants, changes in interest rates and risks related to general or local economic conditions. Some REITs may have limited diversification and may be subject to risks inherent in financing a limited number of properties. Small Capitalization Risk — Smaller capitalization companies in which the Fund invests may be more vulnerable to adverse business or economic events than larger, more established companies. In particular, small capitalization companies may have limited product lines, markets and financial resources and may depend upon a relatively small management group. Therefore, small capitalization stocks may be more volatile than those of larger companies. Small capitalization stocks may be traded over-the-counter or listed on an exchange. Tracking Error Risk — The risk that the Fund's performance may vary substantially from the performance of the benchmark index it tracks as a result of cash flows, Fund expenses, imperfect correlation between the Fund's and benchmark's investments and other factors. Loss of money is a risk of investing in the Fund. Loss of money is a risk of investing in the Fund. Investment Goal Investment results that correspond to the aggregate price and dividend performance of the securities in the S&P 500 Index. EXAMPLE This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. 55 173 302 677 ~ http://seic.com/20130128/role/ScheduleExpenseExampleTransposed20031 column dei_LegalEntityAxis compact ck0000804239_S000018490Member row primary compact * ~ Although your actual costs may be higher or lower, based on these assumptions your costs would be: PORTFOLIO TURNOVER The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 18% of the average value of its portfolio. 0.18 Fees and Expenses This table describes the fees and expenses that you may pay if you buy and hold Fund shares. -0.0015 0.0003 0.0000 0.0051 0.0054 ~ http://seic.com/20130128/role/ScheduleShareholderFees20029 column dei_LegalEntityAxis compact ck0000804239_S000018490Member row primary compact * ~ ~ http://seic.com/20130128/role/ScheduleAnnualFundOperatingExpenses20030 column dei_LegalEntityAxis compact ck0000804239_S000018490Member row primary compact * ~ ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) SHAREHOLDER FEES (fees paid directly from your investment) Performance Information The S&P 500 Index Fund is the successor to SEI Index Funds' S&P 500 Index Fund (the Former S&P 500 Index Fund) and the Former S&P 500 Index Fund's performance and financial history. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. For current performance information, please call 1-800-DIAL-SEI. The Fund commenced operations on September 17, 2007. The performance information prior to September 17, 2007 is based on the performance of the Former S&P 500 Index Fund. 0.2817 0.1043 0.0449 0.1535 0.0518 -0.3744 0.2621 0.1480 0.0177 0.1556 ~ http://seic.com/20130128/role/ScheduleAnnualTotalReturnsBarChart20032 column dei_LegalEntityAxis compact ck0000804239_S000018490Member row primary compact * ~ Best Quarter: 0.1590 2009-06-30 Worst Quarter: -0.2220 2008-12-31 Best Quarter: 15.90% (06/30/09) Worst Quarter: -22.20% (12/31/08) Average Annual Total Returns (for the periods ended December 31, 2012) After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. 0.1556 0.0129 0.0670 0.0634 Class A Return Before Taxes 0.1524 0.0093 0.0623 0.0579 Class A Return After Taxes on Distributions 0.1047 0.0099 0.0581 0.0543 Class A Return After Taxes on Distributions and Sale of Fund Shares 0.1600 0.0166 0.0710 0.0681 S&P 500 Index Return (reflects no deduction for fees, expenses or taxes) 1996-02-28 1996-02-29 ~ http://seic.com/20130128/role/ScheduleAverageAnnualReturnsTransposed20033 column dei_LegalEntityAxis compact ck0000804239_S000018490Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. (reflects no deduction for fees, expenses or taxes) 1-800-DIAL-SEI Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. SIMT Small Cap Fund Principal Investment Strategies Under normal circumstances, the Small Cap Fund will invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in equity securities (both common and preferred stocks) of small companies, including exchange-traded funds (ETFs) based on small capitalization indices and securities of real estate investment trusts (REITs). For purposes of this Fund, a small company is a company with a market capitalization in the range of companies in the Russell 2000 Index (between $2.70 million and $4.70 billion as of December 31, 2012) or the S&P SmallCap 600 Index (between $61.10 million and $3.80 billion as of December 31, 2012), each as determined at the time of purchase. The market capitalization range and the composition of both the Russell 2000 Index and the S&P SmallCap 600 Index are subject to change. The Fund may also invest in warrants and, to a lesser extent, in securities of large capitalization companies. The Fund uses a multi-manager approach, relying upon a number of sub-advisers (each, a Sub-Adviser and collectively, the Sub-Advisers) with differing investment philosophies to manage portions of the Fund's portfolio under the general supervision of SEI Investments Management Corporation (SIMC), the Fund's adviser. In managing its portion of the Fund's assets, each Sub-Adviser generally applies a growth-oriented, a value-oriented or a blended approach to selecting investments. Growth-oriented managers generally select stocks they believe have attractive growth and appreciation potential in light of such characteristics as revenue and earnings growth, expectations from sell-side analysts and relative valuation, while value-oriented managers generally select stocks they believe are attractively valued in light of fundamental characteristics such as earnings, capital structure and/or return on invested capital. Principal Risks Equity Market Risk — The risk that stock prices will fall over short or extended periods of time. Exchange-Traded Funds (ETFs) Risk — The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the ETF is designed to track, although lack of liquidity in an ETF could result in its value being more volatile than the underlying portfolio securities. Investment Style Risk — The risk that small capitalization securities may underperform other segments of the equity markets or the equity markets as a whole. Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the Fund would like. The Fund may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance. Portfolio Turnover Risk — Due to its investment strategy, the Fund may buy and sell securities frequently. This may result in higher transaction costs and additional capital gains tax liabilities. REITs Risk — REITs are trusts that invest primarily in commercial real estate or real estate-related loans. The Fund's investments in REITs will be subject to the risks associated with the direct ownership of real estate. Risks commonly associated with the direct ownership of real estate include fluctuations in the value of underlying properties, defaults by borrowers or tenants, changes in interest rates and risks related to general or local economic conditions. Some REITs may have limited diversification and may be subject to risks inherent in financing a limited number of properties. Small Capitalization Risk — Smaller capitalization companies in which the Fund invests may be more vulnerable to adverse business or economic events than larger, more established companies. In particular, small capitalization companies may have limited product lines, markets and financial resources and may depend upon a relatively small management group. Therefore, small capitalization stocks may be more volatile than those of larger companies. Small capitalization stocks may be traded over-the-counter or listed on an exchange. Loss of money is a risk of investing in the Fund. Loss of money is a risk of investing in the Fund. Investment Goal Capital appreciation. EXAMPLE This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. 131 409 708 1556 ~ http://seic.com/20130128/role/ScheduleExpenseExampleTransposed20038 column dei_LegalEntityAxis compact ck0000804239_S000026001Member row primary compact * ~ Although your actual costs may be higher or lower, based on these assumptions your costs would be: PORTFOLIO TURNOVER The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 114% of the average value of its portfolio. 1.14 Fees and Expenses This table describes the fees and expenses that you may pay if you buy and hold Fund shares. -0.0100 0.0065 0.0000 0.0063 0.0001 0.0129 ~ http://seic.com/20130128/role/ScheduleShareholderFees20036 column dei_LegalEntityAxis compact ck0000804239_S000026001Member row primary compact * ~ ~ http://seic.com/20130128/role/ScheduleAnnualFundOperatingExpenses20037 column dei_LegalEntityAxis compact ck0000804239_S000026001Member row primary compact * ~ ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) The Fund incurred Acquired Fund Fees and Expenses (AFFE) during the most recent fiscal year, and therefore the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus). SHAREHOLDER FEES (fees paid directly from your investment) Performance Information The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for each calendar year since inception and by showing how the Fund's average annual returns for 1 year, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. For current performance information, please call 1-800-DIAL-SEI. 0.2322 -0.0512 0.1314 ~ http://seic.com/20130128/role/ScheduleAnnualTotalReturnsBarChart20039 column dei_LegalEntityAxis compact ck0000804239_S000026001Member row primary compact * ~ Best Quarter: 0.1632 2011-12-31 Worst Quarter: -0.2312 2011-09-30 Best Quarter: 16.32% (12/31/11) Worst Quarter: -23.12% (09/30/11) Average Annual Total Returns (for the periods ended December 31, 2012) After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. 0.1314 0.1025 Class A Return Before Taxes 0.1222 0.0814 Class A Return After Taxes on Distributions 0.0969 0.0806 Class A Return After Taxes on Distributions and Sale of Fund Shares 0.1635 0.1256 Russell 2000 Index Return (reflects no deduction for fees, expenses or taxes) 2009-09-30 2009-09-30 ~ http://seic.com/20130128/role/ScheduleAverageAnnualReturnsTransposed20040 column dei_LegalEntityAxis compact ck0000804239_S000026001Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for each calendar year since inception and by showing how the Fund's average annual returns for 1 year, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. (reflects no deduction for fees, expenses or taxes) 1-800-DIAL-SEI Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. SIMT SMALL CAP VALUE FUND SESVX Principal Investment Strategies Under normal circumstances, the Small Cap Value Fund will invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in equity securities of small companies. The Fund will invest primarily in common stocks of U.S. companies with market capitalizations in the range of companies in the Russell 2000 Index (between $2.70 million and $4.70 billion as of December 31, 2012) or the S&P SmallCap 600 Index (between $61.10 million and $3.80 billion as of December 31, 2012), each as determined at the time of purchase. The market capitalization range and the composition of the Russell 2000 Index and the S&P SmallCap 600 Index are subject to change. The Fund's investments in equity securities may include common and preferred stocks, warrants, and, to a lesser extent, real estate investment trusts (REITs), exchange-traded funds (ETFs) and securities of large capitalization companies. The Fund uses a multi-manager approach, relying upon a number of sub-advisers (each, a Sub-Adviser and collectively, the Sub-Advisers) to manage portions of the Fund's portfolio under the general supervision of SEI Investments Management Corporation (SIMC), the Fund's adviser. In managing its portion of the Fund's assets, each Sub-Adviser selects stocks it believes are attractively valued in light of fundamental characteristics such as earnings, capital structure and/or return on invested capital, among other factors. Principal Risks Equity Market Risk — The risk that stock prices will fall over short or extended periods of time. Exchange-Traded Funds (ETFs) Risk — The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the ETF is designed to track, although lack of liquidity in an ETF could result in its value being more volatile than the underlying portfolio securities. Investment Style Risk — The risk that small capitalization securities may underperform other segments of the equity markets or the equity markets as a whole. Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the Fund would like. The Fund may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance. Portfolio Turnover Risk — Due to its investment strategy, the Fund may buy and sell securities frequently. This may result in higher transaction costs and additional capital gains tax liabilities. REITs Risk — REITs are trusts that invest primarily in commercial real estate or real estate-related loans. The Fund's investments in REITs will be subject to the risks associated with the direct ownership of real estate. Risks commonly associated with the direct ownership of real estate include fluctuations in the value of underlying properties, defaults by borrowers or tenants, changes in interest rates and risks related to general or local economic conditions. Some REITs may have limited diversification and may be subject to risks inherent in financing a limited number of properties. Small Capitalization Risk — Smaller capitalization companies in which the Fund invests may be more vulnerable to adverse business or economic events than larger, more established companies. In particular, small capitalization companies may have limited product lines, markets and financial resources and may depend upon a relatively small management group. Therefore, small capitalization stocks may be more volatile than those of larger companies. Small capitalization stocks may be traded over-the-counter or listed on an exchange. Loss of money is a risk of investing in the Fund. Loss of money is a risk of investing in the Fund. Investment Goal Capital appreciation. EXAMPLE This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. 131 409 708 1556 ~ http://seic.com/20130128/role/ScheduleExpenseExampleTransposed20045 column dei_LegalEntityAxis compact ck0000804239_S000006672Member row primary compact * ~ Although your actual costs may be higher or lower, based on these assumptions your costs would be: PORTFOLIO TURNOVER The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 53% of the average value of its portfolio. 0.53 Fees and Expenses This table describes the fees and expenses that you may pay if you buy and hold Fund shares. -0.0100 0.0065 0.0000 0.0064 0.0129 ~ http://seic.com/20130128/role/ScheduleShareholderFees20043 column dei_LegalEntityAxis compact ck0000804239_S000006672Member row primary compact * ~ ~ http://seic.com/20130128/role/ScheduleAnnualFundOperatingExpenses20044 column dei_LegalEntityAxis compact ck0000804239_S000006672Member row primary compact * ~ ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) The Fund incurred Acquired Fund Fees and Expenses (AFFE) during the most recent fiscal year, and therefore the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus). SHAREHOLDER FEES (fees paid directly from your investment) Performance Information The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. For current performance information, please call 1-800-DIAL-SEI. 0.4279 0.2298 0.0678 0.2019 -0.0680 -0.3419 0.3092 0.2414 -0.0542 0.1544 ~ http://seic.com/20130128/role/ScheduleAnnualTotalReturnsBarChart20046 column dei_LegalEntityAxis compact ck0000804239_S000006672Member row primary compact * ~ Best Quarter: 0.2249 2009-06-30 Worst Quarter: -0.2772 2008-12-31 Best Quarter: 22.49% (06/30/09) Worst Quarter: -27.72% (12/31/08) Average Annual Total Returns (for the periods ended December 31, 2012) After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. 0.1544 0.0315 0.0939 0.0985 Class A Return Before Taxes 0.1525 0.0297 0.0809 0.0825 Class A Return After Taxes on Distributions 0.1028 0.0265 0.0785 0.0802 Class A Return After Taxes on Distributions and Sale of Fund Shares 0.1805 0.0355 0.0950 0.1015 Russell 2000 Value Index Return (reflects no deduction for fees, expenses or taxes) 1994-12-20 1994-12-31 ~ http://seic.com/20130128/role/ScheduleAverageAnnualReturnsTransposed20047 column dei_LegalEntityAxis compact ck0000804239_S000006672Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. (reflects no deduction for fees, expenses or taxes) 1-800-DIAL-SEI Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. SIMT SMALL CAP GROWTH FUND SSCGX Principal Investment Strategies Under normal circumstances, the Small Cap Growth Fund will invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in equity securities of small companies. The Fund will invest primarily in common stocks of U.S. companies with market capitalizations in the range of companies in the Russell 2000 Index (between $2.70 million and $4.70 billion as of December 31, 2012) or the S&P SmallCap 600 Index (between $61.10 million and $3.80 billion as of December 31, 2012), each as determined at the time of purchase. The market capitalization range and the composition of the Russell 2000 Index and the S&P SmallCap 600 Index are subject to change. The Fund's investments in equity securities may include common and preferred stocks, warrants and, to a lesser extent, real estate investment trusts (REITs), exchange-traded funds (ETFs) and securities of large capitalization companies. The Fund uses a multi-manager approach, relying upon a number of sub-advisers (each, a Sub-Adviser and collectively, the Sub-Advisers) to manage portions of the Fund's portfolio under the general supervision of SEI Investments Management Corporation (SIMC), the Fund's adviser. In managing its portion of the Fund's assets, each Sub-Adviser selects stocks it believes have attractive growth and appreciation potential in light of such characteristics as revenue and earnings growth, expectations from sell-side analysts and relative valuation, among other factors. Principal Risks Equity Market Risk — The risk that stock prices will fall over short or extended periods of time. Exchange-Traded Funds (ETFs) Risk — The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the ETF is designed to track, although lack of liquidity in an ETF could result in its value being more volatile than the underlying portfolio securities. Investment Style Risk — The risk that small capitalization securities may underperform other segments of the equity markets or the equity markets as a whole. Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the Fund would like. The Fund may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance. Portfolio Turnover Risk — Due to its investment strategy, the Fund may buy and sell securities frequently. This may result in higher transaction costs and additional capital gains tax liabilities. REITs Risk — REITs are trusts that invest primarily in commercial real estate or real estate-related loans. The Fund's investments in REITs will be subject to the risks associated with the direct ownership of real estate. Risks commonly associated with the direct ownership of real estate include fluctuations in the value of underlying properties, defaults by borrowers or tenants, changes in interest rates and risks related to general or local economic conditions. Some REITs may have limited diversification and may be subject to risks inherent in financing a limited number of properties. Small Capitalization Risk — Smaller capitalization companies in which the Fund invests may be more vulnerable to adverse business or economic events than larger, more established companies. In particular, small capitalization companies may have limited product lines, markets and financial resources and may depend upon a relatively small management group. Therefore, small capitalization stocks may be more volatile than those of larger companies. Small capitalization stocks may be traded over-the-counter or listed on an exchange. Loss of money is a risk of investing in the Fund. Loss of money is a risk of investing in the Fund. Investment Goal Long-term capital appreciation. EXAMPLE This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. 131 409 708 1556 ~ http://seic.com/20130128/role/ScheduleExpenseExampleTransposed20052 column dei_LegalEntityAxis compact ck0000804239_S000006670Member row primary compact * ~ Although your actual costs may be higher or lower, based on these assumptions your costs would be: PORTFOLIO TURNOVER The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 110% of the average value of its portfolio. 1.10 Fees and Expenses This table describes the fees and expenses that you may pay if you buy and hold Fund shares. -0.0100 0.0065 0.0000 0.0064 0.0129 ~ http://seic.com/20130128/role/ScheduleShareholderFees20050 column dei_LegalEntityAxis compact ck0000804239_S000006670Member row primary compact * ~ ~ http://seic.com/20130128/role/ScheduleAnnualFundOperatingExpenses20051 column dei_LegalEntityAxis compact ck0000804239_S000006670Member row primary compact * ~ ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) The Fund incurred Acquired Fund Fees and Expenses (AFFE) during the most recent fiscal year, and therefore the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus). SHAREHOLDER FEES (fees paid directly from your investment) Performance Information The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. For current performance information, please call 1-800-DIAL-SEI. 0.5600 0.0957 0.0348 0.1131 0.0190 -0.4781 0.3826 0.2414 -0.0255 0.1277 ~ http://seic.com/20130128/role/ScheduleAnnualTotalReturnsBarChart20053 column dei_LegalEntityAxis compact ck0000804239_S000006670Member row primary compact * ~ Best Quarter: 0.2743 2003-06-30 Worst Quarter: -0.2967 2008-12-31 Best Quarter: 27.43% (06/30/03) Worst Quarter: -29.67% (12/31/08) Average Annual Total Returns (for the periods ended December 31, 2012) After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. 0.1277 -0.0031 0.0704 0.0822 Class A Return Before Taxes 0.1267 -0.0033 0.0687 0.0676 Class A Return After Taxes on Distributions 0.0837 -0.0027 0.0619 0.0656 Class A Return After Taxes on Distributions and Sale of Fund Shares 0.1459 0.0349 0.0980 0.0650 Russell 2000 Growth Index Return (reflects no deduction for fees, expenses or taxes) 1992-04-20 1992-04-30 ~ http://seic.com/20130128/role/ScheduleAverageAnnualReturnsTransposed20054 column dei_LegalEntityAxis compact ck0000804239_S000006670Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. (reflects no deduction for fees, expenses or taxes) 1-800-DIAL-SEI. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. SIMT TAX-MANAGED SMALL/MID CAP FUND STMSX Principal Investment Strategies Under normal circumstances, the Tax-Managed Small/Mid Cap Fund will invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in equity securities of small and medium capitalization companies. The Fund will invest primarily in common stocks of U.S. companies with market capitalizations in the range of companies in the Russell 2500 Index (between approximately $2.70 million and $10.30 billion as of December 31, 2012) at the time of purchase. The market capitalization range and the composition of the Russell 2500 Index are subject to change. The Fund's investments in equity securities may include common and preferred stocks, warrants and, to a lesser extent, real estate investment trusts (REITs), exchange-traded funds (ETFs) and securities of large capitalization companies. The Fund uses a multi-manager approach, relying upon a number of sub-advisers (each, a Sub-Adviser and collectively, the Sub-Advisers) with differing investment philosophies to manage portions of the Fund's portfolio under the general supervision of SEI Investments Management Corporation (SIMC), the Fund's adviser. In managing its portion of the Fund's assets, each Sub-Adviser generally applies a growth-oriented, a value-oriented or a blended approach to selecting investments. Growth-oriented managers generally select stocks they believe have attractive growth and appreciation potential in light of such characteristics as revenue and earnings growth, expectations from sell-side analysts and relative valuation, while value-oriented managers generally select stocks they believe are attractively valued in light of fundamental characteristics such as earnings, capital structure and/or return on invested capital. Generally, the Sub-Advisers will look to manage the impact of taxes by controlling portfolio turnover levels, selling stocks with the highest tax cost first and opportunistically harvesting losses to offset gains where possible. Principal Risks Equity Market Risk — The risk that stock prices will fall over short or extended periods of time. Exchange-Traded Funds (ETFs) Risk — The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the ETF is designed to track, although lack of liquidity in an ETF could result in its value being more volatile than the underlying portfolio securities. Investment Style Risk — The risk that small or medium capitalization securities may underperform other segments of the equity markets or the equity markets as a whole. Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the Fund would like. The Fund may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance. REITs Risk — REITs are trusts that invest primarily in commercial real estate or real estate-related loans. The Fund's investments in REITs will be subject to the risks associated with the direct ownership of real estate. Risks commonly associated with the direct ownership of real estate include fluctuations in the value of underlying properties, defaults by borrowers or tenants, changes in interest rates and risks related to general or local economic conditions. Some REITs may have limited diversification and may be subject to risks inherent in financing a limited number of properties. Small and Medium Capitalization Companies Risk — The risk that small and medium capitalization companies in which the Fund invests may be more vulnerable to adverse business or economic events than larger, more established companies. In particular, small and medium capitalization companies may have limited product lines, markets and financial resources and may depend upon a relatively small management group. Therefore, small capitalization and medium capitalization stocks may be more volatile than those of larger companies. Small capitalization and medium capitalization stocks may be traded over-the-counter or listed on an exchange. Taxation Risk — The Fund is managed to minimize tax consequences to investors, but will likely earn taxable income and gains from time to time. Loss of money is a risk of investing in the Fund. Loss of money is a risk of investing in the Fund. Investment Goal High long-term after-tax returns. EXAMPLE This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. 131 409 708 1556 ~ http://seic.com/20130128/role/ScheduleExpenseExampleTransposed20059 column dei_LegalEntityAxis compact ck0000804239_S000006677Member row primary compact * ~ Although your actual costs may be higher or lower, based on these assumptions your costs would be: PORTFOLIO TURNOVER The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 67% of the average value of its portfolio. 0.67 Fees and Expenses This table describes the fees and expenses that you may pay if you buy and hold Fund shares. -0.0100 0.0065 0.0000 0.0064 0.0129 ~ http://seic.com/20130128/role/ScheduleShareholderFees20057 column dei_LegalEntityAxis compact ck0000804239_S000006677Member row primary compact * ~ ~ http://seic.com/20130128/role/ScheduleAnnualFundOperatingExpenses20058 column dei_LegalEntityAxis compact ck0000804239_S000006677Member row primary compact * ~ ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) The Fund incurred Acquired Fund Fees and Expenses (AFFE) during the most recent fiscal year, and therefore the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus). SHAREHOLDER FEES (fees paid directly from your investment) Performance Information The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. For current performance information, please call 1-800-DIAL-SEI. 0.4870 0.1662 0.0684 0.1234 0.0165 -0.4116 0.3578 0.2407 -0.0441 0.1517 ~ http://seic.com/20130128/role/ScheduleAnnualTotalReturnsBarChart20060 column dei_LegalEntityAxis compact ck0000804239_S000006677Member row primary compact * ~ Best Quarter: 0.2254 2003-06-30 Worst Quarter: -0.2726 2008-12-31 Best Quarter: 22.54% (06/30/03) Worst Quarter: -27.26% (12/31/08) Average Annual Total Returns (for the periods ended December 31, 2012) After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. 0.1517 0.0176 0.0873 0.0485 Class A Return Before Taxes 0.1508 0.0170 0.0823 0.0445 Class A Return After Taxes on Distributions 0.0997 0.0149 0.0765 0.0417 Class A Return After Taxes on Distributions and Sale of Fund Shares 0.1788 0.0434 0.1049 0.0683 Russell 2500 Index Return (reflects no deduction for fees, expenses or taxes) 2000-10-31 2000-10-31 ~ http://seic.com/20130128/role/ScheduleAverageAnnualReturnsTransposed20061 column dei_LegalEntityAxis compact ck0000804239_S000006677Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. (reflects no deduction for fees, expenses or taxes) 1-800-DIAL-SEI. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. SIMT MID CAP FUND SEMCX Principal Investment Strategies Under normal circumstances, the Mid-Cap Fund will invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in equity securities of medium-sized companies. The Fund will invest primarily in common stocks of U.S. companies with market capitalizations in the range of companies in the Russell Midcap Index (between approximately $317.20 million and $21.40 billion as of December 31, 2012) at the time of purchase. The market capitalization range and the composition of the Russell Midcap Index are subject to change. The Fund's investments in equity securities may include common and preferred stocks, warrants and, to a lesser extent, securities of small capitalization companies, real estate investment trusts (REITs), exchange-traded funds (ETFs) and securities of large capitalization companies. The Fund uses multiple sub-advisers (each, a Sub-Adviser and collectively, the Sub-Advisers) to manage the Fund's portfolio under the general supervision of SEI Investments Management Corporation (SIMC), the Fund's adviser. In managing the Fund's assets, the Sub-Advisers select stocks of companies that have low price-earnings and price-book ratios, but that also have high sustainable growth levels and the probability of high positive earnings revisions. Principal Risks Equity Market Risk — The risk that stock prices will fall over short or extended periods of time. Exchange-Traded Funds (ETFs) Risk — The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the ETF is designed to track, although lack of liquidity in an ETF could result in its value being more volatile than the underlying portfolio securities. Investment Style Risk — The risk that securities of medium capitalization companies may underperform other segments of the equity markets or the equity markets as a whole. Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the Fund would like. The Fund may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance. Portfolio Turnover Risk — Due to its investment strategy, the Fund may buy and sell securities frequently. This may result in higher transaction costs and additional capital gains tax liabilities. REITs Risk — REITs are trusts that invest primarily in commercial real estate or real estate-related loans. The Fund's investments in REITs will be subject to the risks associated with the direct ownership of real estate. Risks commonly associated with the direct ownership of real estate include fluctuations in the value of underlying properties, defaults by borrowers or tenants, changes in interest rates and risks related to general or local economic conditions. Some REITs may have limited diversification and may be subject to risks inherent in financing a limited number of properties. Small and Medium Capitalization Companies Risk — The risk that small and medium capitalization companies in which the Fund invests may be more vulnerable to adverse business or economic events than larger, more established companies. In particular, small and medium capitalization companies may have limited product lines, markets and financial resources and may depend upon a relatively small management group. Therefore, small capitalization and medium capitalization stocks may be more volatile than those of larger companies. Small capitalization and medium capitalization stocks may be traded over-the-counter or listed on an exchange. Loss of money is a risk of investing in the Fund. Loss of money is a risk of investing in the Fund. Investment Goal Long-term capital appreciation. EXAMPLE This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. 107 334 579 1283 ~ http://seic.com/20130128/role/ScheduleExpenseExampleTransposed20066 column dei_LegalEntityAxis compact ck0000804239_S000006675Member row primary compact * ~ Although your actual costs may be higher or lower, based on these assumptions your costs would be: PORTFOLIO TURNOVER The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 81% of the average value of its portfolio. 0.81 Fees and Expenses This table describes the fees and expenses that you may pay if you buy and hold Fund shares. -0.0075 0.0040 0.0000 0.0064 0.0001 0.0105 ~ http://seic.com/20130128/role/ScheduleShareholderFees20064 column dei_LegalEntityAxis compact ck0000804239_S000006675Member row primary compact * ~ ~ http://seic.com/20130128/role/ScheduleAnnualFundOperatingExpenses20065 column dei_LegalEntityAxis compact ck0000804239_S000006675Member row primary compact * ~ ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) The Fund incurred AFFE during the most recent fiscal year, and therefore the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus). SHAREHOLDER FEES (fees paid directly from your investment) Performance Information The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. For current performance information, please call 1-800-DIAL-SEI. 0.4097 0.2274 0.1478 0.1462 0.0229 -0.4145 0.3335 0.2340 -0.0477 0.1706 ~ http://seic.com/20130128/role/ScheduleAnnualTotalReturnsBarChart20067 column dei_LegalEntityAxis compact ck0000804239_S000006675Member row primary compact * ~ Best Quarter: 0.1952 2009-09-30 Worst Quarter: -0.2561 2008-12-31 Best Quarter: 19.52% (09/30/09) Worst Quarter: -25.61% (12/31/08) Average Annual Total Returns (for the periods ended December 31, 2012) After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. 0.1706 0.0144 0.0960 0.0910 Class A Return Before Taxes 0.1694 0.0133 0.0862 0.0767 Class A Return After Taxes on Distributions 0.1124 0.0120 0.0815 0.0742 Class A Return After Taxes on Distributions and Sale of Fund Shares 0.1728 0.0357 0.1065 0.1026 Russell Midcap Index Return (reflects no deduction for fees, expenses or taxes) 1993-02-16 1993-02-28 ~ http://seic.com/20130128/role/ScheduleAverageAnnualReturnsTransposed20068 column dei_LegalEntityAxis compact ck0000804239_S000006675Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. (reflects no deduction for fees, expenses or taxes) 1-800-DIAL-SEI. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. SIMT US MANAGED VOLATILITY FUND Principal Investment Strategies The U.S. Managed Volatility Fund will typically invest in securities of U.S. companies of all capitalization ranges. These securities may include common stocks, preferred stocks, exchange-traded funds (ETFs) and warrants. The Fund may also, to a lesser extent, invest in American depositary receipts (ADRs) and securities of non-U.S. companies. The Fund uses a multi-manager approach, relying on a number of sub-advisers (each, a Sub-Adviser and collectively, the Sub-Advisers) with differing investment philosophies to manage portions of the Fund's portfolio under the general supervision of SEI Investments Management Corporation (SIMC), the Fund's adviser. The Fund seeks to achieve an absolute return of the broad U.S. equity markets, but with a lower absolute volatility. Over the long term, the Fund seeks to achieve a return similar to that of the Russell 3000 Index, but with a lower level of volatility. However, given that the Fund's investment strategy focuses on absolute return and risk, the Fund's sector and market capitalization exposures will typically vary from the index and may cause significant performance deviations relative to the index over shorter-term periods. The Fund seeks to achieve lower volatility by constructing a portfolio of securities that effectively weighs securities based on their total expected risk and return without regard to market capitalization and industry. Principal Risks American Depositary Receipts Risk — ADRs are certificates evidencing ownership of shares of a foreign issuer that are issued by depositary banks and generally trade on an established market. ADRs are subject to many of the risks associated with investing directly in foreign securities, including, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. Equity Market Risk — The risk that stock prices will fall over short or extended periods of time. Exchange-Traded Funds (ETFs) Risk — The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the ETF is designed to track, although lack of liquidity in an ETF could result in its value being more volatile than the underlying portfolio securities. Foreign Investment Risk — The risk that non-U.S. securities may be subject to additional risks due to, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. Investment Style Risk — The risk that equity securities of U.S. companies of all capitalization ranges may underperform other segments of the equity markets or the equity markets as a whole. Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the Fund would like. The Fund may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance. Portfolio Turnover Risk — Due to its investment strategy, the Fund may buy and sell securities frequently. This may result in higher transaction costs and additional capital gains tax liabilities. Small and Medium Capitalization Risk — The risk that small and medium capitalization companies in which the Fund invests may be more vulnerable to adverse business or economic events than larger, more established companies. In particular, small and medium capitalization companies may have limited product lines, markets and financial resources and may depend upon a relatively small management group. Therefore, small capitalization and medium capitalization stocks may be more volatile than those of larger companies. Small capitalization and medium capitalization stocks may be traded over-the-counter or listed on an exchange. Loss of money is a risk of investing in the Fund. Loss of money is a risk of investing in the Fund. Investment Goal Capital appreciation with less volatility than the broad U.S. equity markets. EXAMPLE This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. 131 409 708 1556 ~ http://seic.com/20130128/role/ScheduleExpenseExampleTransposed20073 column dei_LegalEntityAxis compact ck0000804239_S000006678Member row primary compact * ~ Although your actual costs may be higher or lower, based on these assumptions your costs would be: PORTFOLIO TURNOVER The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 48% of the average value of its portfolio. 0.48 Fees and Expenses This table describes the fees and expenses that you may pay if you buy and hold Fund shares. -0.0050 0.0065 0.0000 0.0064 0.0129 ~ http://seic.com/20130128/role/ScheduleShareholderFees20071 column dei_LegalEntityAxis compact ck0000804239_S000006678Member row primary compact * ~ ~ http://seic.com/20130128/role/ScheduleAnnualFundOperatingExpenses20072 column dei_LegalEntityAxis compact ck0000804239_S000006678Member row primary compact * ~ ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) The Fund incurred Acquired Fund Fees and Expenses (AFFE) during the most recent fiscal year, and therefore the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus). SHAREHOLDER FEES (fees paid directly from your investment) Performance Information The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for each calendar year since inception and by showing how the Fund's average annual returns for 1 and 5 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. For current performance information, please call 1-800-DIAL-SEI. 0.0578 0.1375 0.0827 -0.2908 0.1624 0.1488 0.0971 0.1240 ~ http://seic.com/20130128/role/ScheduleAnnualTotalReturnsBarChart20074 column dei_LegalEntityAxis compact ck0000804239_S000006678Member row primary compact * ~ Best Quarter: 0.1154 2009-09-30 Worst Quarter: -0.2035 2008-12-31 Best Quarter: 11.54% (09/30/09) Worst Quarter: -20.35% (12/31/08) Average Annual Total Returns (for the periods ended December 31, 2012) After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. 0.1240 0.0315 0.0632 Class A Return Before Taxes 0.1195 0.0290 0.0586 Class A Return After Taxes on Distributions 0.0865 0.0266 0.0537 Class A Return After Taxes on Distributions and Sale of Fund Shares 0.1642 0.0204 0.0550 Russell 3000 Index Return (reflects no deduction for fees, expenses or taxes) 2004-10-31 2004-10-28 ~ http://seic.com/20130128/role/ScheduleAverageAnnualReturnsTransposed20075 column dei_LegalEntityAxis compact ck0000804239_S000006678Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for each calendar year since inception and by showing how the Fund's average annual returns for 1 and 5 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. (reflects no deduction for fees, expenses or taxes) 1-800-DIAL-SEI. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. SIMT GLOBAL MANAGED VOLATILITY FUND Principal Investment Strategies The Global Managed Volatility Fund will typically invest in securities of U.S. and foreign companies of all capitalization ranges. These securities may include common stocks, preferred stocks, warrants, depositary receipts and exchange-traded funds (ETFs). The Fund also may use futures contracts and forward contracts. Under normal circumstances, the Fund will invest in at least three countries outside of the U.S., but will typically invest much more broadly. It is expected that at least 40% of the Fund's assets will be invested in non-U.S. securities. The Fund will invest primarily in companies located in developed countries, but may also invest in companies located in emerging markets. The Fund uses a multi-manager approach, relying on a number of sub-advisers (each, a Sub-Adviser and collectively, the Sub-Advisers) with differing investment philosophies to manage portions of the Fund's portfolio under the general supervision of SEI Investments Management Corporation (SIMC), the Fund's adviser. This approach is intended to manage the risk characteristics of the Fund. The Fund is expected to achieve an absolute return of the broad global equity markets, but with a lower absolute volatility. Over the long term, the Fund is expected to achieve a return similar to that of the MSCI World 100% USD Hedged Index, but with a lower level of volatility. However, given that the Fund's investment strategy focuses on absolute return and risk, the Fund's country, sector and market capitalization exposures will typically vary from the index and may cause significant performance deviations relative to the index over shorter-term periods. The Fund seeks to achieve lower volatility by constructing a portfolio of securities that the Sub-Advisers believe will produce a less volatile return stream to the market. Each Sub-Adviser effectively weighs securities based on their total expected risk and return without regard to market capitalization and industry. In managing the Fund's currency exposure for foreign securities, the Fund may buy and sell futures or forward contracts on currencies for hedging purposes. Principal Risks Credit Risk — The risk that the issuer of a security or the counterparty to a contract will default or otherwise become unable to honor a financial obligation. Currency Risk — As a result of the Fund's investments in securities or other investments denominated in, and/or receiving revenues in, foreign currencies, the Fund will be subject to currency risk. Currency risk is the risk that foreign currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency hedged. In either event, the dollar value of an investment in the Fund would be adversely affected. Depositary Receipts Risk — Depositary receipts, such as American depositary receipts (ADRs), are certificates evidencing ownership of shares of a foreign issuer that are issued by depositary banks and generally trade on an established market. Depositary receipts are subject to many of the risks associated with investing directly in foreign securities, including, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. Derivatives Risk — The Fund's use of futures contracts and forward contracts is subject to market risk, leverage risk, correlation risk and liquidity risk. Leverage risk and liquidity risk are described below. Market risk is the risk that the market value of an investment may move up and down, sometimes rapidly and unpredictably. Correlation risk is the risk that changes in the value of the derivative may not correlate perfectly with the underlying asset, rate or index. The Fund's use of forward contracts is also subject to credit risk and valuation risk. Valuation risk is the risk that the derivative may be difficult to value and/or valued incorrectly. Credit risk is described above. Each of these risks could cause the Fund to lose more than the principal amount invested in a derivative instrument. Equity Market Risk — The risk that stock prices will fall over short or extended periods of time. Exchange-Traded Funds (ETFs) Risk — The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the ETF is designed to track, although lack of liquidity in an ETF could result in its value being more volatile than the underlying portfolio securities. Foreign Investment/Emerging Markets Risk — The risk that non-U.S. securities may be subject to additional risks due to, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. These additional risks may be heightened with respect to emerging market countries since political turmoil and rapid changes in economic conditions are more likely to occur in these countries. Investment Style Risk — The risk that securities selected as part of a managed volatility strategy may underperform other segments of the equity markets or the equity markets as a whole. Leverage Risk — The Fund's use of derivatives may result in the Fund's total investment exposure substantially exceeding the value of its portfolio securities and the Fund's investment returns depending substantially on the performance of securities that the Fund may not directly own. The use of leverage can amplify the effects of market volatility on the Fund's share price and may also cause the Fund to liquidate portfolio positions when it would not be advantageous to do so in order to satisfy its obligations. The Fund's use of leverage may result in a heightened risk of investment loss. Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the Fund would like. The Fund may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance. Portfolio Turnover Risk — Due to its investment strategy, the Fund may buy and sell securities frequently. This may result in higher transaction costs and additional capital gains tax liabilities. Small and Medium Capitalization Companies Risk — The risk that small and medium capitalization companies in which the Fund invests may be more vulnerable to adverse business or economic events than larger, more established companies. In particular, small and medium capitalization companies may have limited product lines, markets and financial resources and may depend upon a relatively small management group. Therefore, small capitalization and medium capitalization stocks may be more volatile than those of larger companies. Small capitalization and medium capitalization stocks may be traded over-the-counter or listed on an exchange. Loss of money is a risk of investing in the Fund. Loss of money is a risk of investing in the Fund. Investment Goal Capital appreciation with less volatility than the broad global equity markets. EXAMPLE This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. 133 415 718 1579 ~ http://seic.com/20130128/role/ScheduleExpenseExampleTransposed20080 column dei_LegalEntityAxis compact ck0000804239_S000010830Member row primary compact * ~ Although your actual costs may be higher or lower, based on these assumptions your costs would be: PORTFOLIO TURNOVER The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 48% of the average value of its portfolio. 0.48 Fees and Expenses This table describes the fees and expenses that you may pay if you buy and hold Fund shares. -0.0075 0.0065 0.0000 0.0065 0.0001 0.0131 ~ http://seic.com/20130128/role/ScheduleShareholderFees20078 column dei_LegalEntityAxis compact ck0000804239_S000010830Member row primary compact * ~ ~ http://seic.com/20130128/role/ScheduleAnnualFundOperatingExpenses20079 column dei_LegalEntityAxis compact ck0000804239_S000010830Member row primary compact * ~ ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) The Fund incurred AFFE during the most recent fiscal year, and therefore the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus). SHAREHOLDER FEES (fees paid directly from your investment) Performance Information The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for each calendar year since inception and by showing how the Fund's average annual returns for 1 and 5 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. For current performance information, please call 1-800-DIAL-SEI. 0.0003 -0.2713 0.0389 0.0717 0.0458 0.1177 ~ http://seic.com/20130128/role/ScheduleAnnualTotalReturnsBarChart20081 column dei_LegalEntityAxis compact ck0000804239_S000010830Member row primary compact * ~ Best Quarter: 0.0757 2009-09-30 Worst Quarter: -0.1533 2008-12-31 Best Quarter: 7.57% (09/30/09) Worst Quarter: -15.33% (12/31/08) Average Annual Total Returns (for the periods ended December 31, 2012) This table compares the Fund's average annual total returns for Class A Shares to those of a broad-based index and the MSCI World Minimum Volatility Index, 100% Hedged to USD, which is a secondary index designed to serve as a transparent and relevant benchmark for managed volatility equity strategies across the developed market world. This index aims to reflect the performance characteristics of a minimum-variance or managed volatility equity strategy focused on absolute return and volatility with the lowest absolute risk. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. 0.1177 -0.0106 0.0074 Class A Return Before Taxes 0.1127 -0.0116 0.0046 Class A Return After Taxes on Distributions 0.0813 -0.0091 0.0053 Class A Return After Taxes on Distributions and Sale of Fund Shares 0.1577 -0.0123 0.0219 MSCI World 100% USD Hedged Index Return (reflects no deduction for fees, expenses or taxes) 0.0909 0.0090 0.0321 MSCI World Minimum Volatility Index, 100% Hedged to USD Return (reflects no deduction for fees, expenses or taxes) 2006-07-31 2006-07-31 2006-07-27 ~ http://seic.com/20130128/role/ScheduleAverageAnnualReturnsTransposed20082 column dei_LegalEntityAxis compact ck0000804239_S000010830Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for each calendar year since inception and by showing how the Fund's average annual returns for 1 and 5 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. This table compares the Fund's average annual total returns for Class A Shares to those of a broad-based index and the MSCI World Minimum Volatility Index, 100% Hedged to USD, which is a secondary index designed to serve as a transparent and relevant benchmark for managed volatility equity strategies across the developed market world. This index aims to reflect the performance characteristics of a minimum-variance or managed volatility equity strategy focused on absolute return and volatility with the lowest absolute risk. (reflects no deduction for fees, expenses or taxes) 1-800-DIAL-SEI. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. SIMT Tax-Managed Managed Volatility Fund Principal Investment Strategies The Tax-Managed Managed Volatility Fund will typically invest in securities of U.S. companies of all capitalization ranges. These securities may include common stocks, preferred stocks, warrants and exchange-traded funds (ETFs). The Fund may also, to a lesser extent, invest in American depositary receipts (ADRs) and securities of non-U.S. companies. Although the Fund will be measured against the Russell 3000 Index, the Fund is expected to have significant sector and market capitalization deviations from the index given its focus on absolute risk as opposed to index relative risk. This could lead to significant performance deviations relative to the index over shorter-term periods. The Fund uses a multi-manager approach, relying on a number of sub-advisers (each, a Sub-Adviser and collectively, the Sub-Advisers) with differing investment approaches to manage portions of the Fund's portfolio under the general supervision of SEI Investments Management Corporation (SIMC), the Fund's adviser. In managing its portion of the Fund's assets, each Sub-Adviser intends to achieve returns similar to those of the broad U.S. equity markets in a tax-efficient fashion but with a lower level of volatility. The Fund seeks to achieve lower volatility by constructing a portfolio of securities that effectively weighs securities based on their total expected risk and return without regard to market capitalization and industry. This will tend to lead the Fund's Sub-Avisers to construct portfolios with a low beta relative to the overall U.S. equity market. In addition, the Sub-Advisers will look to manage the impact of taxes by controlling portfolio turnover levels, selling stocks with the highest tax cost first and opportunistically harvesting losses to offset gains where possible. Principal Risks Currency Risk — As a result of the Fund's investments in securities denominated in, and/or receiving revenues in, foreign currencies, the Fund will be subject to currency risk. Currency risk is the risk that foreign currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency hedged. In either event, the dollar value of an investment in the Fund would be adversely affected. Depositary Receipts Risk — Depositary receipts, such as ADRs, are certificates evidencing ownership of shares of a foreign issuer that are issued by depositary banks and generally trade on an established market. Depositary receipts are subject to many of the risks associated with investing directly in foreign securities, including, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. Equity Market Risk — The risk that stock prices will fall over short or extended periods of time. Exchange-Traded Funds (ETFs) Risk — The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the ETF is designed to track, although lack of liquidity in an ETF could result in its value being more volatile than the underlying portfolio securities. Foreign Investment Risk — The risk that non-U.S. securities may be subject to additional risks due to, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. Investment Style Risk — The risk that securities selected as part of a managed volatility strategy may underperform other segments of the equity markets or the equity markets as a whole. Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the Fund would like. The Fund may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance. Small and Medium Capitalization Companies Risk — The risk that small and medium capitalization companies in which the Fund invests may be more vulnerable to adverse business or economic events than larger, more established companies. In particular, small and medium capitalization companies may have limited product lines, markets and financial resources and may depend upon a relatively small management group. Therefore, small capitalization and medium capitalization stocks may be more volatile than those of larger companies. Small capitalization and medium capitalization stocks may be traded over-the-counter or listed on an exchange. Taxation Risk — The Fund is managed to minimize tax consequences to investors, but will likely earn taxable income and gains from time to time. Loss of money is a risk of investing in the Fund. Loss of money is a risk of investing in the Fund. Investment Goal To maximize after-tax returns, but with a lower level of volatility than the broad U.S. equity markets. EXAMPLE This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. 131 409 708 1556 ~ http://seic.com/20130128/role/ScheduleExpenseExampleTransposed20087 column dei_LegalEntityAxis compact ck0000804239_S000017259Member row primary compact * ~ Although your actual costs may be higher or lower, based on these assumptions your costs would be: PORTFOLIO TURNOVER The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 30% of the average value of its portfolio. 0.30 Fees and Expenses This table describes the fees and expenses that you may pay if you buy and hold Fund shares. -0.0050 0.0065 0.0000 0.0064 0.0129 ~ http://seic.com/20130128/role/ScheduleShareholderFees20085 column dei_LegalEntityAxis compact ck0000804239_S000017259Member row primary compact * ~ ~ http://seic.com/20130128/role/ScheduleAnnualFundOperatingExpenses20086 column dei_LegalEntityAxis compact ck0000804239_S000017259Member row primary compact * ~ ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) The Fund incurred Acquired Fund Fees and Expenses (AFFE) during the most recent fiscal year, and therefore the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus). SHAREHOLDER FEES (fees paid directly from your investment) Performance Information The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for each calendar year since inception and by showing how the Fund's average annual returns for 1 year and 5 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. For current performance information, please call 1-800-DIAL-SEI. -0.2453 0.1825 0.1521 0.1010 0.1052 ~ http://seic.com/20130128/role/ScheduleAnnualTotalReturnsBarChart20088 column dei_LegalEntityAxis compact ck0000804239_S000017259Member row primary compact * ~ Best Quarter: 0.1110 2009-09-30 Worst Quarter: -0.1720 2008-12-31 Best Quarter: 11.10% (09/30/09) Worst Quarter: -17.20% (12/31/08) Average Annual Total Returns (for the periods ended December 31, 2012) After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. 0.1052 0.0458 0.0447 Class A Return Before Taxes 0.0972 0.0414 0.0402 Class A Return After Taxes on Distributions 0.0790 0.0389 0.0379 Class A Return After Taxes on Distributions and Sale of Fund Shares 0.1642 0.0204 0.0204 Russell 3000 Index Return (reflects no deduction for fees, expenses or taxes) 2007-12-31 2007-12-20 ~ http://seic.com/20130128/role/ScheduleAverageAnnualReturnsTransposed20089 column dei_LegalEntityAxis compact ck0000804239_S000017259Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for each calendar year since inception and by showing how the Fund's average annual returns for 1 year and 5 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. (reflects no deduction for fees, expenses or taxes) 1-800-DIAL-SEI. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. SIMT REAL ESTATE FUND SETAX Principal Investment Strategies Under normal circumstances, the Real Estate Fund will invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in equity securities of real estate companies (e.g., common stocks, rights, warrants, exchange-traded funds (ETFs), convertible securities and preferred stocks of real estate investment trusts (REITs) and real estate operating companies (REOCs)). The Fund is non-diversified and expects to hold a relatively small number of securities, thus increasing the importance of each holding. Generally, the Fund will invest in real estate companies operating in the United States. The Fund uses a multi-manager approach, relying upon a number of sub-advisers (each, a Sub-Adviser and collectively, the Sub-Advisers) to manage portions of the Fund's portfolio under the general supervision of SEI Investments Management Corporation (SIMC), the Fund's adviser. Generally, the Fund will invest in real estate companies operating in the United States. Principal Risks Equity Market Risk — The risk that stock prices will fall over short or extended periods of time. Exchange-Traded Funds (ETFs) Risk — The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the ETF is designed to track, although lack of liquidity in an ETF could result in its value being more volatile than the underlying portfolio securities. Investment Style Risk — The risk that the securities of issuers in the real estate industry may underperform other segments of the equity markets or the equity markets as a whole. Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the Fund would like. The Fund may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance. Non-Diversified Risk — The Fund is non-diversified, which means that it may invest in the securities of relatively few issuers. As a result, the Fund may be more susceptible to a single adverse economic or political occurrence affecting one or more of these issuers and may experience increased volatility due to its investments in those securities. Real Estate Industry Risk — Securities of companies principally engaged in the real estate industry may be subject to the risks associated with the direct ownership of real estate. Risks commonly associated with the direct ownership of real estate include fluctuations in the value of underlying properties, defaults by borrowers or tenants, changes in interest rates and risks related to general or local economic conditions. The Fund's investments are concentrated in issuers conducting business in the real estate industry, and therefore the Fund is subject to risks associated with legislative or regulatory changes, adverse market conditions and/or increased competition affecting that industry. REITs Risk — REITs are trusts that invest primarily in commercial real estate or real estate-related loans. The Fund's investments in REITs will be subject to the risks associated with the direct ownership of real estate, which are discussed above. Some REITs may have limited diversification and may be subject to risks inherent in financing a limited number of properties. Small and Medium Capitalization Companies Risk — The risk that small and medium capitalization REITs and other companies in which the Fund invests may be more vulnerable to adverse business or economic events than larger, more established companies. In particular, small and medium capitalization companies may have limited product lines, markets and financial resources and may depend upon a relatively small management group. Therefore, small capitalization and medium capitalization stocks may be more volatile than those of larger companies. Small capitalization and medium capitalization stocks may be traded over-the-counter or listed on an exchange. Loss of money is a risk of investing in the Fund. The Fund is non-diversified, which means that it may invest in the securities of relatively few issuers. As a result, the Fund may be more susceptible to a single adverse economic or political occurrence affecting one or more of these issuers and may experience increased volatility due to its investments in those securities. Loss of money is a risk of investing in the Fund. Investment Goal Total return, including current income and capital appreciation. EXAMPLE This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. 131 409 708 1556 ~ http://seic.com/20130128/role/ScheduleExpenseExampleTransposed20094 column dei_LegalEntityAxis compact ck0000804239_S000006669Member row primary compact * ~ Although your actual costs may be higher or lower, based on these assumptions your costs would be: PORTFOLIO TURNOVER The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 68% of the average value of its portfolio. 0.68 Fees and Expenses This table describes the fees and expenses that you may pay if you buy and hold Fund shares. -0.0100 0.0065 0.0000 0.0064 0.0129 ~ http://seic.com/20130128/role/ScheduleShareholderFees20092 column dei_LegalEntityAxis compact ck0000804239_S000006669Member row primary compact * ~ ~ http://seic.com/20130128/role/ScheduleAnnualFundOperatingExpenses20093 column dei_LegalEntityAxis compact ck0000804239_S000006669Member row primary compact * ~ ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) The Fund incurred Acquired Fund Fees and Expenses (AFFE) during the most recent fiscal year, and therefore the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus). SHAREHOLDER FEES (fees paid directly from your investment) Performance Information The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for each calendar year since inception and by showing how the Fund's average annual returns for 1 and 5 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. For current performance information, please call 1-800-DIAL-SEI. 0.3694 0.1633 0.3617 -0.1668 -0.4130 0.2495 0.2875 0.0769 0.1536 ~ http://seic.com/20130128/role/ScheduleAnnualTotalReturnsBarChart20095 column dei_LegalEntityAxis compact ck0000804239_S000006669Member row primary compact * ~ Best Quarter: 0.3414 2009-06-30 Worst Quarter: -0.3857 2008-12-31 Best Quarter: 34.14% (06/30/09) Worst Quarter: -38.57% (12/31/08) Average Annual Total Returns (for the periods ended December 31, 2012) After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. 0.1536 0.0324 0.0901 Class A Return Before Taxes 0.1484 0.0249 0.0772 Class A Return After Taxes on Distributions 0.0998 0.0228 0.0719 Class A Return After Taxes on Distributions and Sale of Fund Shares 0.1755 0.0508 0.0942 Wilshire U.S. Real Estate Securities Index Return (reflects no deduction for fees, expenses or taxes) 2003-11-30 2003-11-13 ~ http://seic.com/20130128/role/ScheduleAverageAnnualReturnsTransposed20096 column dei_LegalEntityAxis compact ck0000804239_S000006669Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for each calendar year since inception and by showing how the Fund's average annual returns for 1 and 5 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. (reflects no deduction for fees, expenses or taxes) 1-800-DIAL-SEI. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. SIMT Enhanced Income Fund - Class A Principal Investment Strategies The Enhanced Income Fund invests primarily in a diversified portfolio of investment grade and non-investment grade fixed-income securities (junk bonds), including: (i) securities issued or guaranteed by the U.S. Government and its agencies and instrumentalities and obligations of U.S. and foreign commercial banks, such as certificates of deposit, time deposits, bankers' acceptances and bank notes; (ii) obligations of foreign governments; (iii) U.S. and foreign corporate debt securities, including commercial paper, and fully-collateralized repurchase agreements with counterparties deemed credit-worthy by the Fund's sub-advisers (each, a Sub-Adviser and collectively, the Sub-Advisers); and (iv) securitized issues such as mortgage-backed securities, asset-backed securities, commercial mortgage-backed securities and collateralized debt obligations. These securities may be fixed-, variable- or floating-rate obligations and will be rated CCC- or higher at the time of purchase by at least one rating agency. There are no restrictions on the maturity of any individual securities or on the Fund's average portfolio maturity, although the average portfolio duration of the Fund will typically vary between zero and two years. The Fund may also invest in other financial instruments or use other investment techniques to seek to obtain market exposure to the securities in which the Fund primarily invests. The Fund uses a multi-manager approach under the general supervision of SEI Investments Management Corporation (SIMC), the Fund's adviser, which allocates the Fund's assets among multiple Sub-Advisers that use different investment strategies designed to produce a total return that exceeds the total return of the 3-Month London Interbank Offered Rate (LIBOR). The Fund also invests a portion of its assets in bank loans, which are, generally, non-investment grade (junk bond) floating rate instruments. The Fund may invest in bank loans in the form of participations in the loans (participations) and assignments of all or a portion of the loans from third parties (assignments). The Fund may also invest in futures contracts and swap agreements (also called "swaps") for speculative or hedging purposes. Futures contracts and swaps may be used to synthetically obtain exposure to securities or baskets of securities and to manage the Fund's interest rate duration and yield curve exposure. These derivatives may also be used to mitigate the Fund's overall level of risk and/or the Fund's risk to particular types of securities, currencies or market segments. Interest rate swaps may further be used to manage the Fund's yield spread sensitivity. When the Fund seeks to take an active long or short position with respect to the likelihood of an event of default of a security or basket of securities, the Fund may use credit default swaps. The Fund may buy credit default swaps in an attempt to manage credit risk where the Fund has credit exposure to an issuer, and the Fund may sell credit default swaps to more efficiently gain credit exposure to a security or basket of securities. Principal Risks Asset-Backed Securities Risk — Payment of principal and interest on asset-backed securities is dependent largely on the cash flows generated by the assets backing the securities, and asset-backed securities may not have the benefit of any security interest in the related assets. Bank Loans Risk — With respect to bank loans, the Fund will assume the credit risk of both the borrower and the lender that is selling the participation in the loan. The Fund may also have difficulty disposing of bank loans because, in certain cases, the market for such instruments is not highly liquid. Below Investment Grade Securities (Junk Bonds) Risk — Fixed income securities rated below investment grade (junk bonds) involve greater risks of default or downgrade and are more volatile than investment grade securities because the prospect for repayment of principal and interest of many of these securities is speculative. Corporate Fixed Income Securities Risk — Corporate fixed income securities respond to economic developments, especially changes in interest rates, as well as perceptions of the creditworthiness and business prospects of individual issuers. Credit Risk — The risk that the issuer of a security or the counterparty to a contract will default or otherwise become unable to honor a financial obligation. Currency Risk — As a result of the Fund's investments in securities denominated in, and/or receiving revenues in, foreign currencies, the Fund will be subject to currency risk. Currency risk is the risk that foreign currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency hedged. In either event, the dollar value of an investment in the Fund would be adversely affected. Derivatives Risk — The Fund's use of futures contracts and swaps is subject to market risk, leverage risk, correlation risk and liquidity risk. Leverage risk and liquidity risk are described below. Market risk is the risk that the market value of an investment may move up and down, sometimes rapidly and unpredictably. Correlation risk is the risk that changes in the value of the derivative may not correlate perfectly with the underlying asset, rate or index. The Fund's use of swap agreements is also subject to credit risk and valuation risk. Valuation risk is the risk that the derivative may be difficult to value and/or valued incorrectly. Credit risk is described above. Each of these risks could cause the Fund to lose more than the principal amount invested in a derivative instrument. Extension Risk — The risk that rising interest rates may extend the duration of a fixed income security, typically reducing the security's value. Fixed Income Market Risk — The prices of the Fund's fixed income securities respond to economic developments, particularly interest rate changes, as well as to perceptions about the creditworthiness of individual issuers, including governments and their agencies. In the case of foreign securities, price fluctuations will reflect international economic and political events, as well as changes in currency valuations relative to the U.S. dollar. Foreign Investment/Emerging Markets Risk — The risk that non-U.S. securities may be subject to additional risks due to, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. These additional risks may be heightened with respect to emerging market countries since political turmoil and rapid changes in economic conditions are more likely to occur in these countries. Interest Rate Risk — The risk that the value of fixed income securities, including U.S. Government securities, will fall due to rising interest rates. Investment Style Risk — The risk that short-duration fixed income securities may underperform other segments of the fixed income markets or the fixed income markets as a whole. Leverage Risk — The Fund's use of derivatives may result in the Fund's total investment exposure substantially exceeding the value of its portfolio securities and the Fund's investment returns depending substantially on the performance of securities that the Fund may not directly own. The use of leverage can amplify the effects of market volatility on the Fund's share price and may also cause the Fund to liquidate portfolio positions when it would not be advantageous to do so in order to satisfy its obligations. The Fund's use of leverage may result in a heightened risk of investment loss. Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the Fund would like. The Fund may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance. Mortgage-Backed Securities Risk — Mortgage-backed securities are affected by, among other things, interest rate changes and the possibility of prepayment of the underlying mortgage loans. Mortgage-backed securities are also subject to the risk that underlying borrowers will be unable to meet their obligations. Portfolio Turnover Risk — Due to its investment strategy, the Fund may buy and sell securities frequently. This may result in higher transaction costs and additional capital gains tax liabilities. Prepayment Risk — The risk that, with declining interest rates, fixed income securities with stated interest rates may have the principal paid earlier than expected, requiring the Fund to invest the proceeds at generally lower interest rates. U.S. Government Securities Risk — Although U.S. Government securities are considered to be among the safest investments, they are not guaranteed against price movements due to changing interest rates. Obligations issued by some U.S. Government agencies are backed by the U.S. Treasury, while others are backed solely by the ability of the agency to borrow from the U.S. Treasury or by the agency's own resources. Loss of money is a risk of investing in the Fund. Loss of money is a risk of investing in the Fund. Investment Goal Capital appreciation and income. EXAMPLE This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. 107 334 579 1283 ~ http://seic.com/20130128/role/ScheduleExpenseExampleTransposed20101 column dei_LegalEntityAxis compact ck0000804239_S000012016Member row primary compact * ~ Although your actual costs may be higher or lower, based on these assumptions your costs would be: PORTFOLIO TURNOVER The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 198% of the average value of its portfolio. 1.98 Fees and Expenses This table describes the fees and expenses that you may pay if you buy and hold Fund shares. -0.0075 0.0040 0.0000 0.0065 0.0105 ~ http://seic.com/20130128/role/ScheduleShareholderFees20099 column dei_LegalEntityAxis compact ck0000804239_S000012016Member row primary compact * ~ ~ http://seic.com/20130128/role/ScheduleAnnualFundOperatingExpenses20100 column dei_LegalEntityAxis compact ck0000804239_S000012016Member row primary compact * ~ ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) SHAREHOLDER FEES (fees paid directly from your investment) Performance Information The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for each calendar year since inception and by showing how the Fund's average annual returns for 1 and 5 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. For current performance information, please call 1-800-DIAL-SEI. -0.0103 -0.2808 0.1590 0.0527 0.0025 0.0529 ~ http://seic.com/20130128/role/ScheduleAnnualTotalReturnsBarChart20102 column dei_LegalEntityAxis compact ck0000804239_S000012016Member row primary compact * ~ Best Quarter: 0.0693 2009-06-30 Worst Quarter: -0.1959 2008-12-31 Best Quarter: 6.93% (06/30/09) Worst Quarter: -19.59% (12/31/08) Average Annual Total Returns (for the periods ended December 31, 2012) After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. 0.0529 -0.0152 -0.0089 Class A Return Before Taxes 0.0453 -0.0250 -0.0207 Class A Return After Taxes on Distributions 0.0343 -0.0185 -0.0142 Class A Return After Taxes on Distributions and Sale of Fund Shares 0.0051 0.0118 0.0214 BofA Merrill Lynch 3-Month LIBOR Constant Maturity Index Return (reflects no deduction for fees, expenses or taxes) 2006-07-31 2006-07-27 ~ http://seic.com/20130128/role/ScheduleAverageAnnualReturnsTransposed20103 column dei_LegalEntityAxis compact ck0000804239_S000012016Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for each calendar year since inception and by showing how the Fund's average annual returns for 1 and 5 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. (reflects no deduction for fees, expenses or taxes) 1-800-DIAL-SEI. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. SIMT CORE FIXED INCOME FUND TRLVX Principal Investment Strategies Under normal circumstances, the Core Fixed Income Fund will invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in fixed income securities. The Fund will invest primarily in investment and non-investment grade (junk bond) U.S. and foreign corporate and government fixed income securities, including emerging market, asset-backed securities and mortgage-backed securities. The Fund may invest in securities denominated in either U.S. dollars or foreign currency. The Fund uses a multi-manager approach, relying upon a number of sub-advisers (each, a Sub-Adviser and collectively, the Sub-Advisers) with differing investment philosophies to manage portions of the Fund's portfolio under the general supervision of SEI Investments Management Corporation (SIMC), the Fund's adviser. Sub-Advisers are selected for their expertise in managing various kinds of fixed income securities, and each Sub-Adviser makes investment decisions based on an analysis of yield trends, credit ratings and other factors in accordance with its particular discipline. The Fund may also invest in futures contracts, forward contracts and swaps for speculative or hedging purposes. Futures contracts, forward contracts and swaps may be used to synthetically obtain exposure to securities or baskets of securities and to manage the Fund's interest rate duration and yield curve exposure. These derivatives may also be used to mitigate the Fund's overall level of risk and/or the Fund's risk to particular types of securities, currencies or market segments. Interest rate swaps may further be used to manage the Fund's yield spread sensitivity. When the Fund seeks to take an active long or short position with respect to the likelihood of an event of default of a security or basket of securities, the Fund may use credit default swaps. The Fund may buy credit default swaps in an attempt to manage credit risk where the Fund has credit exposure to an issuer, and the Fund may sell credit default swaps to more efficiently gain credit exposure to a security or basket of securities. The Sub-Advisers may also engage in currency transactions using futures and foreign currency forward contracts either to seek to hedge the Fund's currency exposure or to enhance the Fund's returns. The Fund may take long and short positions in foreign currencies in excess of the value of the Fund's assets denominated in a particular currency or when the Fund does not own assets denominated in that currency. The Fund will invest primarily in investment grade securities (those rated AAA, AA, A and BBB-). However, the Fund may also invest in non-rated securities or securities rated below investment grade (BB+, B and CCC). The Fund may also invest a portion of its assets in bank loans, which are, generally, non-investment grade (junk bond) floating rate instruments. The Fund may invest in bank loans in the form of participations in the loans (participations) and assignments of all or a portion of the loans from third parties (assignments). While each Sub-Adviser chooses securities of different types and maturities, the Fund, in the aggregate, generally will have a dollar-weighted average duration that is consistent with that of the broad U.S. fixed income market, as represented by the Barclays Capital U.S. Aggregate Bond Index. Duration is a measure of the expected life of a fixed income security that is used to determine the sensitivity of a security's price to changes in interest rates. The dollar-weighted average duration of the Barclays Capital U.S. Aggregate Bond Index varies significantly over time, but as of December 31, 2012 it was 5.06 years. Principal Risks Asset-Backed Securities Risk — Payment of principal and interest on asset-backed securities is dependent largely on the cash flows generated by the assets backing the securities, and asset-backed securities may not have the benefit of any security interest in the related assets. Bank Loans Risk — With respect to bank loans, the Fund will assume the credit risk of both the borrower and the lender that is selling the participation. The Fund may also have difficulty disposing of bank loans because, in certain cases, the market for such instruments is not highly liquid. Below Investment Grade Securities (Junk Bonds) Risk — Fixed income securities rated below investment grade (junk bonds) involve greater risks of default or downgrade and are more volatile than investment grade securities because the prospect for repayment of principal and interest of many of these securities is speculative. Corporate Fixed Income Securities Risk — Corporate fixed income securities respond to economic developments, especially changes in interest rates, as well as perceptions of the creditworthiness and business prospects of individual issuers. Credit Risk — The risk that the issuer of a security or the counterparty to a contract will default or otherwise become unable to honor a financial obligation. Currency Risk — Due to the Fund's active positions in currencies, it will be subject to the risk that currency exchange rates may fluctuate in response to, among other things, changes in interest rates, intervention (or failure to intervene) by U.S. or foreign governments, central banks or supranational entities, or by the imposition of currency controls or other political developments in the United States or abroad. Derivatives Risk — The Fund's use of futures contracts, forward contracts and swaps is subject to market risk, leverage risk, correlation risk and liquidity risk. Leverage risk and liquidity risk are described below. Market risk is the risk that the market value of an investment may move up and down, sometimes rapidly and unpredictably. Correlation risk is the risk that changes in the value of the derivative may not correlate perfectly with the underlying asset, rate or index. The Fund's use of forward contracts and swap agreements is also subject to credit risk and valuation risk. Valuation risk is the risk that the derivative may be difficult to value and/or valued incorrectly. Credit risk is described above. Each of these risks could cause the Fund to lose more than the principal amount invested in a derivative instrument. Exchange-Traded Funds (ETFs) Risk — The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the ETF is designed to track, although lack of liquidity in an ETF could result in its value being more volatile than the underlying portfolio securities. Extension Risk — The risk that rising interest rates may extend the duration of a fixed income security, typically reducing the security's value. Fixed Income Market Risk — The prices of the Fund's fixed income securities respond to economic developments, particularly interest rate changes, as well as to perceptions about the creditworthiness of individual issuers, including governments and their agencies. Generally, the Fund's fixed income securities will decrease in value if interest rates rise and vice versa. In the case of foreign securities, price fluctuations will reflect international economic and political events, as well as changes in currency valuations relative to the U.S. dollar. Foreign Investment/Emerging Markets Risk — The risk that non-U.S. securities may be subject to additional risks due to, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. These additional risks may be heightened with respect to emerging market countries since political turmoil and rapid changes in economic conditions are more likely to occur in these countries. Interest Rate Risk — The risk that the value of fixed income securities, including U.S. Government securities, will fall due to rising interest rates. Investment Style Risk — The risk that U.S. fixed income securities may underperform other segments of the fixed income markets or the fixed income markets as a whole. Leverage Risk — The Fund's use of derivatives may result in the Fund's total investment exposure substantially exceeding the value of its portfolio securities and the Fund's investment returns depending substantially on the performance of securities that the Fund may not directly own. The use of leverage can amplify the effects of market volatility on the Fund's share price and may also cause the Fund to liquidate portfolio positions when it would not be advantageous to do so in order to satisfy its obligations. The Fund's use of leverage may result in a heightened risk of investment loss. Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the Fund would like. The Fund may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance. Mortgage-Backed Securities Risk — Mortgage-backed securities are affected by, among other things, interest rate changes and the possibility of prepayment of the underlying mortgage loans. Mortgage-backed securities are also subject to the risk that underlying borrowers will be unable to meet their obligations. Portfolio Turnover Risk — Due to its investment strategy, the Fund may buy and sell securities frequently. This may result in higher transaction costs and additional capital gains tax liabilities. Prepayment Risk — The risk that, with declining interest rates, fixed income securities with stated interest rates may have the principal paid earlier than expected, requiring the Fund to invest the proceeds at generally lower interest rates. Short Sales Risk — A short sale involves the sale of a security that the Fund does not own in the expectation of purchasing the same security (or a security exchangeable therefore) at a later date at a lower price. Short sales expose the Fund to the risk that it will be required to buy the security sold short (also known as "covering" the short position) at a time when the security has appreciated in value, thus resulting in a loss to the Fund. Investment in short sales may also cause the Fund to incur expenses related to borrowing securities. U.S. Government Securities Risk — Although U.S. Government securities are considered to be among the safest investments, they are not guaranteed against price movements due to changing interest rates. Obligations issued by some U.S. Government agencies are backed by the U.S. Treasury, while others are backed solely by the ability of the agency to borrow from the U.S. Treasury or by the agency's own resources. Loss of money is a risk of investing in the Fund. Loss of money is a risk of investing in the Fund. Investment Goal Current income consistent with the preservation of capital. EXAMPLE This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. 89 278 482 1073 ~ http://seic.com/20130128/role/ScheduleExpenseExampleTransposed20108 column dei_LegalEntityAxis compact ck0000804239_S000006667Member row primary compact * ~ Although your actual costs may be higher or lower, based on these assumptions your costs would be: PORTFOLIO TURNOVER The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 349% of the average value of its portfolio. 3.49 Fees and Expenses This table describes the fees and expenses that you may pay if you buy and hold Fund shares. -0.0060 0.0028 0.0000 0.0057 0.0002 0.0087 ~ http://seic.com/20130128/role/ScheduleShareholderFees20106 column dei_LegalEntityAxis compact ck0000804239_S000006667Member row primary compact * ~ ~ http://seic.com/20130128/role/ScheduleAnnualFundOperatingExpenses20107 column dei_LegalEntityAxis compact ck0000804239_S000006667Member row primary compact * ~ ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) The Fund incurred AFFE during the most recent fiscal year, and therefore the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus). SHAREHOLDER FEES (fees paid directly from your investment) Performance Information The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. For current performance information, please call 1-800-DIAL-SEI. 0.0532 0.0466 0.0218 0.0455 0.0404 -0.0713 0.1848 0.1101 0.0724 0.0808 ~ http://seic.com/20130128/role/ScheduleAnnualTotalReturnsBarChart20109 column dei_LegalEntityAxis compact ck0000804239_S000006667Member row primary compact * ~ Best Quarter: 0.0812 2009-09-30 Worst Quarter: -0.0323 2008-09-30 Best Quarter: 8.12% (09/30/09) Worst Quarter: -3.23% (09/30/08) Average Annual Total Returns (for the periods ended December 31, 2012) After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. 0.0808 0.0720 0.0566 0.0692 Class A Return Before Taxes 0.0698 0.0560 0.0403 0.0467 Class A Return After Taxes on Distributions 0.0523 0.0520 0.0387 0.0459 Class A Return After Taxes on Distributions and Sale of Fund Shares 0.0422 0.0595 0.0518 0.0725 Barclays Capital U.S. Aggregate Bond Index Return (reflects no deduction for fees, expenses or taxes) 1987-05-01 1987-05-31 ~ http://seic.com/20130128/role/ScheduleAverageAnnualReturnsTransposed20110 column dei_LegalEntityAxis compact ck0000804239_S000006667Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. (reflects no deduction for fees, expenses or taxes) 1-800-DIAL-SEI. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. SIMT U.S. Fixed Income Fund Principal Investment Strategies Under normal circumstances, the U.S. Fixed Income Fund will invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in investment grade U.S. fixed income securities. The Fund will invest primarily in U.S. corporate and government fixed income securities, including mortgage-backed securities and asset-backed securities. The Fund uses a multi-manager approach, relying upon a number of sub-advisers (each, a Sub-Adviser and collectively, the Sub-Advisers) with differing investment philosophies to manage portions of the Fund's portfolio under the general supervision of SEI Investments Management Corporation (SIMC), the Fund's adviser. Sub-Advisers are selected for their expertise in managing various kinds of fixed income securities, and each Sub-Adviser makes investment decisions based on an analysis of yield trends, credit ratings and other factors in accordance with its particular discipline. The Fund may also invest in futures contracts, forward contracts, options and swaps for speculative or hedging purposes. Futures contracts, forward contracts, options and swaps may be used to synthetically obtain exposure to securities or baskets of securities and to manage the Fund's interest rate duration and yield curve exposure. These derivatives may also be used to mitigate the Fund's overall level of risk and/or the Fund's risk to particular types of securities, currencies or market segments. Interest rate swaps may further be used to manage the Fund's yield spread sensitivity. When the Fund seeks to take an active long or short position with respect to the likelihood of an event of default of a security or basket of securities, the Fund may use credit default swaps. The Fund may buy credit default swaps in an attempt to manage credit risk where the Fund has credit exposure to an issuer, and the Fund may sell credit default swaps to more efficiently gain credit exposure to a security or basket of securities. The Fund will invest primarily in investment grade securities (those rated AAA, AA, A and BBB-) as rated by S&P or a similar ratings agency. However, the Fund may also invest in non-rated securities or securities rated below investment grade (junk bonds or those rated BB+, B and CCC). The Fund may also invest in exchange-traded funds (ETFs) to gain exposure to a particular portion of the market while awaiting an opportunity to purchase securities directly. While each Sub-Adviser chooses securities of different types and maturities, the Fund, in the aggregate, generally will have a dollar-weighted average duration that is consistent with that of the broad U.S. fixed income market as represented by the Barclays Capital U.S. Aggregate Bond Index. Duration is a measure of the expected life of a fixed income security that is used to determine the sensitivity of a security's price to changes in interest rates. For example, a 5 year duration means the fixed income security will decrease in value by 5% if interest rates rise 1% and increase in value by 5% if interest rates fall 1%. The dollar-weighted average duration of the Barclays Capital U.S. Aggregate Bond Index varies significantly over time, but as of December 31, 2012 it was 5.06 years. Principal Risks Asset-Backed Securities Risk — Payment of principal and interest on asset-backed securities is dependent largely on the cash flows generated by the assets backing the securities, and asset-backed securities may not have the benefit of any security interest in the related assets. Below Investment Grade Securities (Junk Bonds) Risk — Fixed income securities rated below investment grade (junk bonds) involve greater risks of default or downgrade and are more volatile than investment grade securities because the prospect for repayment of principal and interest of many of these securities is speculative. Corporate Fixed Income Securities Risk — Corporate fixed income securities respond to economic developments, especially changes in interest rates, as well as perceptions of the creditworthiness and business prospects of individual issuers. Credit Risk — The risk that the issuer of a security or the counterparty to a contract will default or otherwise become unable to honor a financial obligation. Derivatives Risk — The Fund's use of futures contracts, forward contracts, options and swaps is subject to market risk, leverage risk, correlation risk and liquidity risk. Leverage risk and liquidity risk are described below. Market risk is the risk that the market value of an investment may move up and down, sometimes rapidly and unpredictably. Correlation risk is the risk that changes in the value of the derivative may not correlate perfectly with the underlying asset, rate or index. The Fund's use of forward contracts and swap agreements is also subject to credit risk and valuation risk. Valuation risk is the risk that the derivative may be difficult to value and/or valued incorrectly. Credit risk is described above. Each of these risks could cause the Fund to lose more than the principal amount invested in a derivative instrument. Exchange-Traded Funds (ETFs) Risk — The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the ETF is designed to track, although lack of liquidity in an ETF could result in its value being more volatile than the underlying portfolio securities. Extension Risk — The risk that rising interest rates may extend the duration of a fixed income security, typically reducing the security's value. Fixed Income Market Risk — The prices of the Fund's fixed income securities respond to economic developments, particularly interest rate changes, as well as to perceptions about the creditworthiness of individual issuers, including governments and their agencies. In the case of foreign securities, price fluctuations will reflect international economic and political events, as well as changes in currency valuations relative to the U.S. dollar. Interest Rate Risk — The risk that the value of fixed income securities, including U.S. Government securities, will fall due to rising interest rates. Investment Style Risk — The risk that U.S. fixed income securities may underperform other segments of the fixed income markets or the fixed income markets as a whole. Leverage Risk — The Fund's use of derivatives may result in the Fund's total investment exposure substantially exceeding the value of its portfolio securities and the Fund's investment returns depending substantially on the performance of securities that the Fund may not directly own. The use of leverage can amplify the effects of market volatility on the Fund's share price and may also cause the Fund to liquidate portfolio positions when it would not be advantageous to do so in order to satisfy its obligations. The Fund's use of leverage may result in a heightened risk of investment loss. Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the Fund would like. The Fund may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance. Mortgage-Backed Securities Risk — Mortgage-backed securities are affected by, among other things, interest rate changes and the possibility of prepayment of the underlying mortgage loans. Mortgage-backed securities are also subject to the risk that underlying borrowers will be unable to meet their obligations. Portfolio Turnover Risk — Due to its investment strategy, the Fund may buy and sell securities frequently. This may result in higher transaction costs and additional capital gains tax liabilities. Prepayment Risk — The risk that, with declining interest rates, fixed income securities with stated interest rates may have the principal paid earlier than expected, requiring the Fund to invest the proceeds at generally lower interest rates. U.S. Government Securities Risk — Although U.S. Government securities are considered to be among the safest investments, they are not guaranteed against price movements due to changing interest rates. Obligations issued by some U.S. Government agencies are backed by the U.S. Treasury, while others are backed solely by the ability of the agency to borrow from the U.S. Treasury or by the agency's own resources. Loss of money is a risk of investing in the Fund. Loss of money is a risk of investing in the Fund. Investment Goal Current income consistent with the preservation of capital. EXAMPLE This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. 90 281 488 1084 ~ http://seic.com/20130128/role/ScheduleExpenseExampleTransposed20115 column dei_LegalEntityAxis compact ck0000804239_S000025531Member row primary compact * ~ Although your actual costs may be higher or lower, based on these assumptions your costs would be: PORTFOLIO TURNOVER The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 322% of the average value of its portfolio. 3.22 Fees and Expenses This table describes the fees and expenses that you may pay if you buy and hold Fund shares. -0.0060 0.0028 0.0000 0.0059 0.0001 0.0088 ~ http://seic.com/20130128/role/ScheduleShareholderFees20113 column dei_LegalEntityAxis compact ck0000804239_S000025531Member row primary compact * ~ ~ http://seic.com/20130128/role/ScheduleAnnualFundOperatingExpenses20114 column dei_LegalEntityAxis compact ck0000804239_S000025531Member row primary compact * ~ ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) The Fund incurred Acquired Fund Fees and Expenses (AFFE) during the most recent fiscal year, and therefore the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus). SHAREHOLDER FEES (fees paid directly from your investment) Performance Information The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for each calendar year since inception and by showing how the Fund's average annual returns for 1 year, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. For current performance information, please call 1-800-DIAL-SEI. 0.0752 0.0762 0.0600 ~ http://seic.com/20130128/role/ScheduleAnnualTotalReturnsBarChart20116 column dei_LegalEntityAxis compact ck0000804239_S000025531Member row primary compact * ~ Best Quarter: 0.0351 2011-09-30 Worst Quarter: -0.0094 2010-12-31 Best Quarter: 3.51% (09/30/11) Worst Quarter: -0.94% (12/31/10) Average Annual Total Returns (for the periods ended December 31, 2012) After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. 0.0600 0.0727 Class A Return Before Taxes 0.0412 0.0530 Class A Return After Taxes on Distributions 0.0396 0.0510 Class A Return After Taxes on Distributions and Sale of Fund Shares 0.0422 0.0612 Barclays Capital U.S. Aggregate Bond Index Return (reflects no deduction for fees, expenses or taxes) 2009-07-31 2009-07-02 ~ http://seic.com/20130128/role/ScheduleAverageAnnualReturnsTransposed20117 column dei_LegalEntityAxis compact ck0000804239_S000025531Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for each calendar year since inception and by showing how the Fund's average annual returns for 1 year, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. (reflects no deduction for fees, expenses or taxes) 1-800-DIAL-SEI. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. SIMT HIGH YIELD BOND FUND SHYAX Principal Investment Strategies Under normal circumstances, the High Yield Bond Fund will invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in high yield fixed income securities. The Fund will invest primarily in fixed income securities rated below investment grade (junk bonds), including corporate bonds and debentures, convertible and preferred securities, zero coupon obligations and collateralized debt obligations (CDOs) and collateralized loan obligations (CLOs). The Fund uses a multi-manager approach, relying upon a number of sub-advisers (each, a Sub-Adviser and collectively, the Sub-Advisers) with differing investment philosophies to manage portions of the Fund's portfolio under the general supervision of SEI Investments Management Corporation (SIMC), the Fund's adviser. To a limited extent, SIMC may also directly manage a portion of the Fund's portfolio. In managing the Fund's assets, the Sub-Advisers and, to the extent applicable, SIMC, seek to select securities that offer a high current yield as well as total return potential. The Fund's securities seek to be diversified as to issuers and industries. The Fund's average weighted maturity may vary, but will generally not exceed ten years. There is no limit on the maturity or credit quality of any security. As noted above, the Fund will invest primarily in securities rated BB, B, CCC, CC, C and D. However, it may also invest in non-rated securities or securities rated investment grade (AAA, AA, A and BBB). The Fund may also invest in exchange-traded funds (ETFs) to gain exposure to a particular portion of the market while awaiting an opportunity to purchase securities directly. The Fund may also invest a portion of its assets in bank loans, which are, generally, non-investment grade (junk bond) floating rate instruments. The Fund may invest in bank loans in the form of participations in the loans (participations) and assignments of all or a portion of the loans from third parties (assignments). Principal Risks Bank Loans Risk — With respect to bank loans, the Fund will assume the credit risk of both the borrower of the loan and the lender that is selling the participation in the loan. The Fund may also have difficulty disposing of bank loans because, in certain cases, the market for such instruments is not highly liquid. Below Investment Grade Securities (Junk Bonds) Risk — Fixed income securities rated below investment grade (junk bonds) involve greater risks of default or downgrade and are more volatile than investment grade securities because the prospect for repayment of principal and interest of many of these securities is speculative. CDOs and CLOs Risk — CDOs and CLOs are securities backed by an underlying portfolio of debt and loan obligations, respectively. CDOs and CLOs issue classes or "tranches" that vary in risk and yield and may experience substantial losses due to actual defaults, decrease of market value due to collateral defaults and removal of subordinate tranches, market anticipation of defaults and investor aversion to CDO and CLO securities as a class. The risks of investing in CDOs and CLOs depend largely on the tranche invested in and the type of the underlying debts and loans in the tranche of the CDO or CLO, respectively, in which the Fund invests. CDOs and CLOs also carry risks including, but not limited to, interest rate risk and credit risk, which are described below. Convertible and Preferred Securities Risk — Convertible and preferred securities have many of the same characteristics as stocks, including many of the same risks. In addition, convertible securities may be more sensitive to changes in interest rates than stocks. Convertible securities may also have credit ratings below investment grade, meaning that they carry a higher risk of failure by the issuer to pay principal and/or interest when due. Corporate Fixed Income Securities Risk — Corporate fixed income securities respond to economic developments, especially changes in interest rates, as well as perceptions of the creditworthiness and business prospects of individual issuers. Credit Risk — The risk that the issuer of a security or the counterparty to a contract will default or otherwise become unable to honor a financial obligation. Exchange-Traded Funds (ETFs) Risk — The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the ETF is designed to track, although lack of liquidity in an ETF could result in its value being more volatile than the underlying portfolio securities. Extension Risk — The risk that rising interest rates may extend the duration of a fixed income security, typically reducing the security's value. Fixed Income Market Risk — The prices of the Fund's fixed income securities respond to economic developments, particularly interest rate changes, as well as to perceptions about the creditworthiness of individual issuers, including governments and their agencies. Generally, the Fund's fixed income securities will decrease in value if interest rates rise and vice versa. In the case of foreign securities, price fluctuations will reflect international economic and political events, as well as changes in currency valuations relative to the U.S. dollar. Interest Rate Risk — The risk that the Fund's yield will decline due to falling interest rates. A rise in interest rates typically causes a fall in values of fixed income securities in which the Fund invests, while a fall in interest rates typically causes a rise in the values of such securities. Investment Style Risk — The risk that high yield fixed income securities may underperform other segments of the fixed income markets or the fixed income markets as a whole. Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the Fund would like. The Fund may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance. Prepayment Risk — The risk that, with declining interest rates, fixed income securities with stated interest rates may have the principal paid earlier than expected, requiring the Fund to invest the proceeds at generally lower interest rates. Loss of money is a risk of investing in the Fund. Loss of money is a risk of investing in the Fund. Investment Goal Total return. EXAMPLE This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. 116 362 628 1386 ~ http://seic.com/20130128/role/ScheduleExpenseExampleTransposed20122 column dei_LegalEntityAxis compact ck0000804239_S000006673Member row primary compact * ~ Although your actual costs may be higher or lower, based on these assumptions your costs would be: PORTFOLIO TURNOVER The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 65% of the average value of its portfolio. 0.65 Fees and Expenses This table describes the fees and expenses that you may pay if you buy and hold Fund shares. -0.0100 0.0049 0.0000 0.0063 0.0002 0.0114 ~ http://seic.com/20130128/role/ScheduleShareholderFees20120 column dei_LegalEntityAxis compact ck0000804239_S000006673Member row primary compact * ~ ~ http://seic.com/20130128/role/ScheduleAnnualFundOperatingExpenses20121 column dei_LegalEntityAxis compact ck0000804239_S000006673Member row primary compact * ~ ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) The Fund incurred AFFE during the most recent fiscal year, and therefore operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus). SHAREHOLDER FEES (fees paid directly from your investment) Performance Information The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. For current performance information, please call 1-800-DIAL-SEI. 0.2115 0.1023 0.0207 0.1011 0.0148 -0.3055 0.5696 0.1742 0.0426 0.1578 ~ http://seic.com/20130128/role/ScheduleAnnualTotalReturnsBarChart20123 column dei_LegalEntityAxis compact ck0000804239_S000006673Member row primary compact * ~ Best Quarter: 0.2211 2009-06-30 Worst Quarter: -0.2194 2008-12-31 Best Quarter: 22.11% (06/30/09) Worst Quarter: -21.94% (12/31/08) Average Annual Total Returns (for the periods ended December 31, 2012) After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. 0.1578 0.0881 0.0880 0.0781 Class A Return Before Taxes 0.1310 0.0546 0.0562 0.0430 Class A Return After Taxes on Distributions 0.1015 0.0542 0.0559 0.0443 Class A Return After Taxes on Distributions and Sale of Fund Shares 0.1555 0.1014 0.1038 BofA Merrill Lynch U.S. High Yield Constrained Index Return (reflects no deduction for fees, expenses or taxes) 1995-01-11 ~ http://seic.com/20130128/role/ScheduleAverageAnnualReturnsTransposed20124 column dei_LegalEntityAxis compact ck0000804239_S000006673Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. (reflects no deduction for fees, expenses or taxes) 1-800-DIAL-SEI. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. SIMT Real Return Fund Principal Investment Strategies The Real Return Fund uses a multi-manager approach under the general supervision of SEI Investments Management Corporation (SIMC), the Fund's adviser, which allocates the Fund's assets among multiple sub-advisers (each, a Sub-Adviser and collectively, the Sub-Advisers) using different investment strategies designed to produce a total return that exceeds the rate of inflation in the U.S. Under normal circumstances, the Fund will invest a significant portion of its assets in investment grade fixed income securities, including inflation-indexed bonds of varying maturities issued by the U.S. Treasury, other U.S. Government agencies and instrumentalities and non-government entities, such as corporations. An inflation-indexed bond is a bond that is structured so that its principal value will change with inflation. Treasury Inflation-Protected Securities (TIPS) are a type of inflation-indexed bond in which the Fund may invest. The Fund's exposure to fixed income securities is not restricted by maturity requirements. The Fund may also invest in futures contracts, options, forward contracts and swaps for risk management purposes, speculative or hedging purposes. Futures contracts, forward contracts and swaps may be used to synthetically obtain exposure to securities or baskets of securities and to manage the Fund's interest rate duration and yield curve exposure. These derivatives may also be used to mitigate the Fund's overall level of risk and/or the Fund's risk to particular types of securities or market segments. Interest rate swaps may further be used to manage the Fund's yield spread sensitivity. Securities index swaps may be used to manage the inflation-adjusted return of the Fund. The Fund may also invest in other financial instruments or use other investment techniques (such as reverse repurchase agreements) to seek to obtain market exposure to the securities in which the Fund primarily invests. The Fund may invest in: (i) securities issued or guaranteed by the U.S. Government and its agencies and instrumentalities and obligations of U.S. and foreign commercial banks, such as certificates of deposit, time deposits, bankers' acceptances and bank notes; (ii) obligations of foreign governments; (iii) U.S. and foreign corporate debt securities, including commercial paper, and fully-collateralized repurchase agreements with highly rated counterparties (those rated A or better); and (iv) securitized issues such as mortgage-backed securities issued by U.S. Government agencies. Principal Risks Corporate Fixed Income Securities Risk — Corporate fixed income securities respond to economic developments, especially changes in interest rates, as well as perceptions of the creditworthiness and business prospects of individual issuers. Credit Risk — The risk that the issuer of a security or the counterparty to a contract will default or otherwise become unable to honor a financial obligation. Derivatives Risk — The Fund's use of futures contracts, options, forward contracts and swaps is subject to market risk, leverage risk, correlation risk and liquidity risk. Leverage risk and liquidity risk are described below. Market risk is the risk that the market value of an investment may move up and down, sometimes rapidly and unpredictably. Correlation risk is the risk that changes in the value of the derivative may not correlate perfectly with the underlying asset, rate or index. The Fund's use of forward contracts and swaps is also subject to credit risk and valuation risk. Valuation risk is the risk that the derivative may be difficult to value and/or valued incorrectly. Credit risk is described above. Each of these risks could cause the Fund to lose more than the principal amount invested in a derivative instrument. Extension Risk — The risk that rising interest rates may extend the duration of a fixed income security, typically reducing the security's value. Fixed Income Market Risk — The prices of the Fund's fixed income securities respond to economic developments, particularly interest rate changes, as well as to perceptions about the creditworthiness of individual issuers, including governments and their agencies. In the case of foreign securities, price fluctuations will reflect international economic and political events, as well as changes in currency valuations relative to the U.S. dollar. Foreign Issuer Risk — The risk that non-U.S. securities may be subject to additional risks due to, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. Inflation Protected Securities Risk — The value of inflation protected securities, including TIPS, will typically fluctuate in response to changes in "real" interest rates, generally decreasing when real interest rates rise and increasing when real interest rates fall. Real interest rates represent nominal (or stated) interest rates reduced by the expected impact of inflation. In addition, interest payments on inflation-indexed securities will generally vary up or down along with the rate of inflation. Interest Rate Risk — The risk that the value of fixed income securities, including U.S. Government securities, will fall due to rising interest rates. Leverage Risk — The Fund's use of derivatives may result in the Fund's total investment exposure substantially exceeding the value of its portfolio securities and the Fund's investment returns depending substantially on the performance of securities that the Fund may not directly own. The use of leverage can amplify the effects of market volatility on the Fund's share price and may also cause the Fund to liquidate portfolio positions when it would not be advantageous to do so in order to satisfy its obligations. The Fund's use of leverage may result in a heightened risk of investment loss. Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the Fund would like. The Fund may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance. Mortgage-Backed Securities Risk — Mortgage-backed securities are affected by, among other things, interest rate changes and the possibility of prepayment of the underlying mortgage loans. Mortgage-backed securities are also subject to the risk that underlying borrowers will be unable to meet their obligations. Portfolio Turnover Risk — Due to its investment strategy, the Fund may buy and sell securities frequently. This may result in higher transaction costs and additional capital gains tax liabilities. Prepayment Risk — The risk that, with declining interest rates, fixed income securities with stated interest rates may have the principal paid earlier than expected, requiring the Fund to invest the proceeds at generally lower interest rates. U.S. Government Securities Risk — Although U.S. Government securities are considered to be among the safest investments, they are not guaranteed against price movements due to changing interest rates. Obligations issued by some U.S. Government agencies are backed by the U.S. Treasury, while others are backed solely by the ability of the agency to borrow from the U.S. Treasury or by the agency's own resources. Loss of money is a risk of investing in the Fund. Loss of money is a risk of investing in the Fund. Investment Goal Total return exceeding the rate of inflation. EXAMPLE This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that Fund operating expenses remain the same. 87 271 471 1049 ~ http://seic.com/20130128/role/ScheduleExpenseExampleTransposed20129 column dei_LegalEntityAxis compact ck0000804239_S000013604Member row primary compact * ~ Although your actual costs may be higher or lower, based on these assumptions your costs would be: PORTFOLIO TURNOVER The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 137% of the average value of its portfolio. 1.37 Fees and Expenses This table describes the fees and expenses that you may pay if you buy and hold Fund shares. -0.0025 0.0022 0.0000 0.0063 0.0085 ~ http://seic.com/20130128/role/ScheduleShareholderFees20127 column dei_LegalEntityAxis compact ck0000804239_S000013604Member row primary compact * ~ ~ http://seic.com/20130128/role/ScheduleAnnualFundOperatingExpenses20128 column dei_LegalEntityAxis compact ck0000804239_S000013604Member row primary compact * ~ ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) SHAREHOLDER FEES (fees paid directly from your investment) Performance Information The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for each calendar year since inception and by showing how the Fund's average annual returns for 1 year and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. For current performance information, please call 1-800-DIAL-SEI. 0.0350 0.0470 0.0223 ~ http://seic.com/20130128/role/ScheduleAnnualTotalReturnsBarChart20130 column dei_LegalEntityAxis compact ck0000804239_S000013604Member row primary compact * ~ Best Quarter: 0.0243 2011-03-31 Worst Quarter: -0.0037 2012-06-30 Best Quarter: 2.43% (03/31/11) Worst Quarter: -0.37% (06/30/12) Average Annual Total Returns (for the periods ended December 31, 2012) After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. 0.0223 0.0418 Class A Return Before Taxes 0.0091 0.0311 Class A Return After Taxes on Distributions 0.0145 0.0295 Class A Return After Taxes on Distributions and Sale of Fund Shares 0.0266 0.0462 Barclays Capital 1-5 Year U.S. TIPS Index Return (reflects no deduction for fees, expenses or taxes) 2009-07-02 2009-07-02 ~ http://seic.com/20130128/role/ScheduleAverageAnnualReturnsTransposed20131 column dei_LegalEntityAxis compact ck0000804239_S000013604Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for each calendar year since inception and by showing how the Fund's average annual returns for 1 year and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. (reflects no deduction for fees, expenses or taxes) 1-800-DIAL-SEI. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. SIMT Multi-Strategy Alternative Fund Principal Investment Strategies The Fund employs a strategy intended to generate an absolute (i.e., positive) return in various market cycles with reduced correlation to the stock and bond markets. The Fund allocates its assets among a variety of investment strategies through the use of: (i) affiliated and unaffiliated funds, including open-end funds, closed-end funds and exchange traded funds (Underlying Funds); and/or (ii) one or more investment sub-advisers (each, a Sub-Adviser and collectively, the Sub-Advisers). In addition, SEI Investments Management Corporation (SIMC), the Fund's adviser, may directly manage a portion of the Fund's portfolio. The Underlying Funds or Sub-Advisers that are employed may apply any of a variety of investment strategies, which may include: (i) directional or tactical strategies, such as long/short equity, long/short credit and global tactical asset allocation; (ii) event driven strategies, such as distressed securities, special situations and merger arbitrage; and (iii) arbitrage strategies, such as fixed income or interest rate arbitrage, convertible arbitrage, pairs trading and equity market neutral. The Fund will allocate its assets among Underlying Funds and/or Sub-Advisers based on SIMC's analysis of the investment strategy, historical performance and the potential for each strategy to perform independently of each other. By allocating its assets in this manner, the Fund will seek to reduce risk, lower volatility and achieve positive returns in various market cycles. Allocation of assets to any one Underlying Fund, Sub-Adviser or strategy will vary based on market conditions. By investing in an Underlying Fund, the Fund becomes a shareholder of that Underlying Fund. Underlying Funds and Sub-Advisers may invest in a broad range of asset classes, securities and other investments to achieve their designated investment strategies, which may include U.S., foreign and emerging markets securities, equity securities of all types and capitalization ranges, investment and non-investment grade fixed income securities (junk bonds) of any duration or maturity issued by corporations or governments, commodities, currencies, warrants, depositary receipts, exchange traded notes and derivative instruments, principally equity options, futures contracts, options on futures contracts, forward contracts and swap agreements. In addition, the Fund may invest in cash, money market instruments and other short-term obligations to achieve its investment goal. The Fund currently allocates assets to one Sub-Adviser pursuant to SIMC's "manager-of-managers" model, and such Sub-Adviser manages a portion of the Fund's portfolio under the general supervision of SIMC. The Fund is intended to be only one component of an investor's broader investment program and is not designed to be a complete investment program. Investors who seek to add an alternative component to their overall investment program may wish to allocate a portion of their investment to the Fund. Principal Risks While the Fund seeks to achieve an absolute return with reduced correlation to stock and bond markets, it may not achieve positive returns over short or long term periods. Investment strategies that have historically been non-correlated or have demonstrated low correlations to one another or to stock and bond markets may become correlated at certain times and, as a result, may cease to function as anticipated over either short or long term periods. The success of the Fund's investment strategy depends both on SIMC's selection of the Underlying Funds and Sub-Advisers and allocating assets to such Underlying Funds and Sub-Advisers. SIMC, an Underlying Fund or a Sub-Adviser may be incorrect in assessing market trends, the value or growth capability of particular securities or asset classes. In addition, the methodology by which SIMC allocates the Fund's assets to the Underlying Funds and Sub-Advisers may not achieve desired results and may cause the Fund to lose money or underperform other comparable mutual funds. The Fund, Underlying Funds and Sub-Advisers may apply any of a variety of investment strategies and may invest in a broad range of asset classes, securities and other investments to achieve their designated investment strategies. The principal risks of using such investment strategies and making investments in such asset classes, securities and other investments are set forth below. Because an Underlying Fund's use of an investment strategy or investment in an asset class, security or other investment is subject to the same or similar risks as the Fund's use of such strategy or investment in such asset class, security or other investment, the term "the Fund" in the paragraphs below collectively refers to both the Fund and each Underlying Fund. Arbitrage Strategies Risk — Arbitrage strategies involve engaging in transactions that attempt to exploit price differences of identical, related or similar securities on different markets or in different forms. The Fund may realize losses or reduced rate of return if underlying relationships among securities in which it takes investment positions change in an adverse manner or if a transaction is unexpectedly terminated or delayed. Trading to seek short-term capital appreciation can be expected to cause the Fund's portfolio turnover rate to be substantially higher than that of the average equity-oriented investment company. Asset-Backed Securities Risk — Payment of principal and interest on asset-backed securities is dependent largely on the cash flows generated by the assets backing the securities, and asset-backed securities may not have the benefit of any security interest in the related assets. Below Investment Grade Securities (Junk Bonds) Risk — Fixed income securities rated below investment grade (junk bonds) involve greater risks of default or downgrade and are more volatile than investment grade securities because the prospect of repayment of principal and interest of many of these securities is speculative. Commodity-Linked Securities Risk — Investments in commodity-linked securities may be more volatile and less liquid than direct investments in the underlying commodities themselves. Commodity-related equity returns can also be affected by the issuer's financial structure or the performance of unrelated businesses. Corporate Fixed Income Securities Risk — Corporate fixed income securities respond to economic developments, especially changes in interest rates, as well as perceptions of the creditworthiness and business prospects of individual issuers. Credit Risk — The risk that the issuer of a security or the counterparty to a contract will default or otherwise become unable to honor a financial obligation. Currency Risk — Due to its active positions in currencies, the Fund will be subject to the risk that currency exchange rates may fluctuate in response to, among other things, changes in interest rates, intervention (or failure to intervene) by U.S. or foreign governments, central banks or supranational entities or by the imposition of currency controls or other political developments in the United States or abroad. Derivatives Risk — The Fund's use of futures contracts, options, forward contracts and swaps is subject to market risk, leverage risk, correlation risk and liquidity risk. Leverage risk and liquidity risk are described below. Market risk is the risk that the market value of an investment may move up and down, sometimes rapidly and unpredictably. Correlation risk is the risk that changes in the value of the derivative may not correlate perfectly with the underlying asset, rate or index. The Fund's use of forward contracts and swap agreements is also subject to credit risk and valuation risk. Valuation risk is the risk that the derivative may be difficult to value and/or valued incorrectly. Credit risk is described above. Each of these risks could cause the Fund to lose more than the principal amount invested in a derivative instrument. Directional or Tactical Strategies Risk — Directional or tactical strategies usually use long and short positions, which entail predicting the direction that particular securities or sectors or the overall market might move. Directional or tactical strategies may utilize leverage and hedging. There may be a significant risk of loss if the Fund's judgment is incorrect as to the direction, timing or extent of expected movements of particular securities or sectors or the market as a whole. Distressed Securities Risk — Distressed securities frequently do not produce income while they are outstanding and may require the Fund to bear certain extraordinary expenses in order to protect and recover its investment. Distressed securities are at high risk for default. Equity Market Risk — The risk that stock prices will fall over short or extended periods of time. Event-Driven Strategies Risk — Event-driven strategies involve making evaluations and predictions about both the likelihood that a particular event in the life of a company will occur and the impact such an event will have on the value of the company's securities. The transaction in which such a company is involved may be unsuccessful, take considerable time (or longer than anticipated) or may result in a distribution of cash or a new security, the value of which may be less than the purchase price of the company's security. If an anticipated transaction does not occur, the Fund may be required to sell its securities at a loss. Exchange-Traded Notes (ETNs) — The value of an ETN is subject to the credit risk of the issuer. There may not be an active trading market available for some ETNs. Additionally, trading of ETNs may be halted or delisted by the listing exchange. Fixed Income Market Risk — The prices of the Fund's fixed income securities respond to economic developments, particularly interest rate changes, as well as to perceptions about the creditworthiness of individual issuers, including governments and their agencies. In the case of foreign securities, price fluctuations will reflect international economic and political events, as well as changes in currency valuations relative to the U.S. dollar. Foreign Investment/Emerging Markets Risk — The risk that non-U.S. securities may be subject to additional risks due to, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. These additional risks may be heightened with respect to emerging market countries since political turmoil and rapid changes in economic conditions are more likely to occur in these countries. Interest Rate Risk — The risk that the value of fixed income securities, including U.S. Government securities, will fall due to rising interest rates. Investment Company and Exchange-Traded Funds (ETFs) Risk — When the Fund invests in an investment company, in addition to directly bearing the expenses associated with its own operations, it will bear a pro rata portion of the investment company's expenses. In addition, while the risks of owning shares of an investment company generally reflect the risks of owning the underlying investments of the investment company, the Fund may be subject to additional or different risks than if the Fund had invested directly in the underlying investments. For example, the lack of liquidity in an ETF could result in its value being more volatile than the underlying portfolio securities. Closed-end investment companies issue a fixed number of shares that trade on a stock exchange or over-the-counter at a premium or a discount to their net asset value. As a result, a closed-end fund's share price fluctuates based on what another investor is willing to pay rather than on the market value of the securities in the fund. Leverage Risk — The Fund's use of derivatives may result in the Fund's total investment exposure substantially exceeding the value of its portfolio securities and the Fund's investment returns depending substantially on the performance of securities that the Fund may not directly own. The use of leverage can amplify the effects of market volatility on the Fund's share price and may also cause the Fund to liquidate portfolio positions when it would not be advantageous to do so in order to satisfy its obligations. The Fund's use of leverage may result in a heightened risk of investment loss. Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the Fund would like. The Fund may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance. Mortgage-Backed Securities Risk — Mortgage-backed securities are affected by, among other things, interest rate changes and the possibility of prepayment of the underlying mortgage loans. Mortgage-backed securities are also subject to the risk that underlying borrowers will be unable to meet their obligations. Portfolio Turnover Risk — Due to their investment strategies, the Fund and the Underlying Funds may buy and sell securities frequently. This may result in higher transaction costs and additional capital gains tax liabilities. Short Sales Risk — A short sale involves the sale of a security that the Fund does not own in the expectation of purchasing the same security (or a security exchangeable therefore) at a later date at a lower price. Short sales expose the Fund to the risk that it will be required to buy the security sold short (also known as "covering" the short position) at a time when the security has appreciated in value, thus resulting in a loss to the Fund. Investment in short sales may also cause the Fund to incur expenses related to borrowing securities. Small and Medium Capitalization Companies Risk — The risk that small and medium capitalization companies in which the Fund invests may be more vulnerable to adverse business or economic events than larger, more established companies. In particular, small and medium capitalization companies may have limited product lines, markets and financial resources and may depend upon a relatively small management group. Therefore, small capitalization and medium capitalization stocks may be more volatile than those of larger companies. Small capitalization and medium capitalization stocks may be traded over-the-counter or listed on an exchange. Warrants Risk — Warrants are instruments that entitle the holder to buy an equity security at a specific price for a specific period of time. Warrants may be more speculative than other types of investments. The price of a warrant may be more volatile than the price of its underlying security, and a warrant may offer greater potential for capital appreciation as well as capital loss. A warrant ceases to have value if it is not exercised prior to its expiration date. U.S. Government Securities Risk — Although U.S. Government securities are considered to be among the safest investments, they are not guaranteed against price movements due to changing interest rates. Obligations issued by some U.S. Government agencies are backed by the U.S. Treasury, while others are backed solely by the ability of the agency to borrow from the U.S. Treasury or by the agency's own resources. Loss of money is a risk of investing in the Fund. Loss of money is a risk of investing in the Fund. Investment Goal The Fund allocates its assets among a variety of investment strategies to seek to generate an absolute return with reduced correlation to the stock and bond markets. EXAMPLE This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. 426 1287 2161 4405 ~ http://seic.com/20130128/role/ScheduleExpenseExampleTransposed20136 column dei_LegalEntityAxis compact ck0000804239_S000028026Member row primary compact * ~ Although your actual costs may be higher or lower, based on these assumptions your costs would be: PORTFOLIO TURNOVER The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 44% of the average value of its portfolio. 0.44 Fees and Expenses This table describes the fees and expenses that you may pay if you buy and hold Fund shares. -0.0025 0.0150 0.0000 0.0002 0.0063 0.0065 0.0209 0.0424 ~ http://seic.com/20130128/role/ScheduleShareholderFees20134 column dei_LegalEntityAxis compact ck0000804239_S000028026Member row primary compact * ~ ~ http://seic.com/20130128/role/ScheduleAnnualFundOperatingExpenses20135 column dei_LegalEntityAxis compact ck0000804239_S000028026Member row primary compact * ~ ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) The Fund incurred AFFE during the most recent fiscal year, and therefore the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus) because the financial statements include only the direct operating expenses incurred by the Fund, not the indirect costs of investing in other investment companies. SHAREHOLDER FEES (fees paid directly from your investment) Performance Information The bar chart and the performance table below provide some indication of the risks of an investment in the Fund by comparing the Fund's performance from year to year for each calendar year since inception and by showing how the Fund's average annual returns for 1 year and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. For current performance information, please call 1-800-DIAL-SEI. -0.0277 0.0194 ~ http://seic.com/20130128/role/ScheduleAnnualTotalReturnsBarChart20137 column dei_LegalEntityAxis compact ck0000804239_S000028026Member row primary compact * ~ Best Quarter: 0.0148 2012-03-31 Worst Quarter: -0.0420 2011-09-30 Best Quarter: 1.48% (03/31/12) Worst Quarter: -4.20% (09/30/11) Average Annual Total Returns (for the periods ended December 31, 2012) After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. 0.0194 -0.0014 Class A Return Before Taxes 0.0179 -0.0057 Class A Return After Taxes on Distributions 0.0131 -0.0033 Class A Return After Taxes on Distributions and Sale of Fund Shares 0.0011 0.0012 BofA Merrill Lynch 3-Month U.S. Treasury Bills Index (reflects no deduction for fees, expenses or taxes) 2010-03-31 2010-03-31 ~ http://seic.com/20130128/role/ScheduleAverageAnnualReturnsTransposed20138 column dei_LegalEntityAxis compact ck0000804239_S000028026Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ Although the Fund's performance is benchmarked against the return of the BofA Merrill Lynch 3-Month U.S. Treasury Bills Index, an investment in the Fund is substantially different from an investment in U.S. Treasury bills. Among other things, Treasury bills are backed by the full faith and credit of the U.S. Government and have a fixed rate of return. Investors in Treasury bills do not risk losing their investment, whereas loss of money is a risk of investing in the Fund. Further, an investment in the Fund is expected to be substantially more volatile than an investment in Treasury bills because of the breadth and types of securities and other instruments in which the Fund may invest. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. The bar chart and the performance table below provide some indication of the risks of an investment in the Fund by comparing the Fund's performance from year to year for each calendar year since inception and by showing how the Fund's average annual returns for 1 year and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. (reflects no deduction for fees, expenses or taxes) 1-800-DIAL-SEI. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. SIMT Large Cap Fund Principal Investment Strategies Under normal circumstances, the Large Cap Fund will invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in equity securities of large companies. For purposes of this Fund, a large company is a company with a market capitalization in the range of companies in the Russell 1000 Index (between $317.20 million and $499.80 billion as of December 31, 2012) at the time of purchase. The market capitalization range and the composition of the Russell 1000 Index are subject to change. These securities may include common stocks, preferred stocks, warrants, American depositary receipts (ADRs) and exchange-traded funds (ETFs). The Fund may also, to a lesser extent, invest in common and preferred stocks of small capitalization companies. The Fund may invest up to 20% of its assets in foreign securities. In managing its portion of the Fund's assets, each Sub-Adviser generally applies either a growth-oriented, a value-oriented or a blended approach to selecting investments. Growth oriented managers generally select stocks they believe have attractive growth and appreciation potential in light of such characteristics as revenue and earnings growth, expectations from sell-side analysts and relative valuation, while value-oriented managers generally select stocks they believe are attractively valued in light of fundamental characteristics such as earnings, capital structure and/or return on invested capital. The Fund uses a multi-manager approach, relying on a number of sub-advisers (each, a Sub-Adviser and collectively, the Sub-Advisers) with differing investment philosophies and strategies to manage portions of the Fund's portfolio under the general supervision of SEI Investments Management Corporation (SIMC), the Fund's adviser. Principal Risks Currency Risk — As a result of the Fund's investments in securities or other investments denominated in, and/or receiving revenues in, foreign currencies, the Fund will be subject to currency risk. Currency risk is the risk that foreign currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency hedged. In either event, the dollar value of an investment in the Fund would be adversely affected. Depositary Receipts Risk — Depositary receipts, such as ADRs, are certificates evidencing ownership of shares of a foreign issuer that are issued by depositary banks and generally trade on an established market. Depositary receipts are subject to many of the risks associated with investing directly in foreign securities, including, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. Equity Market Risk — The risk that stock prices will fall over short or extended periods of time. Exchange-Traded Funds (ETFs) Risk — The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the ETF is designed to track, although lack of liquidity in an ETF could result in its value being more volatile than the underlying portfolio securities. Foreign Investment Risk — The risk that non-U.S. securities may be subject to additional risks due to, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. Investment Style Risk — The risk that large capitalization securities may underperform other segments of the equity markets or the equity markets as a whole. Leverage Risk — The use of leverage can amplify the effects of market volatility on the Fund's share price and may also cause the Fund to liquidate portfolio positions when it would not be advantageous to do so in order to satisfy its obligations. Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the Fund would like. The Fund may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance. Portfolio Turnover Risk — Due to its investment strategy, the Fund may buy and sell securities frequently. This may result in higher transaction costs and additional capital gains tax liabilities. Short Sales Risk — A short sale involves the sale of a security that the Fund does not own in the expectation of purchasing the same security (or a security exchangeable therefore) at a later date at a lower price. Short sales expose the Fund to the risk that it will be required to buy the security sold short (also known as "covering" the short position) at a time when the security has appreciated in value, thus resulting in a loss to the Fund. Investment in short sales may also cause the Fund to incur expenses related to borrowing securities. Reinvesting proceeds received from short selling may create leverage, which can amplify the effects of market volatility on the Fund's share price. Small Capitalization Risk — Smaller capitalization companies in which the Fund invests may be more vulnerable to adverse business or economic events than larger, more established companies. In particular, small capitalization companies may have limited product lines, markets and financial resources and may depend upon a relatively small management group. Therefore, small capitalization stocks may be more volatile than those of larger companies. Small capitalization stocks may be traded over-the-counter or listed on an exchange. Loss of money is a risk of investing in the Fund. Loss of money is a risk of investing in the Fund. Investment Goal Long-term growth of capital and income. EXAMPLE This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. 130 406 702 1545 ~ http://seic.com/20130128/role/ScheduleExpenseExampleTransposed20143 column dei_LegalEntityAxis compact ck0000804239_S000026000Member row primary compact * ~ Although your actual costs may be higher or lower, based on these assumptions your costs would be: PORTFOLIO TURNOVER The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 50% of the average value of its portfolio. 0.50 Fees and Expenses This table describes the fees and expenses that you may pay if you buy and hold Fund shares. -0.0050 0.0039 0.0000 0.0089 0.0128 ~ http://seic.com/20130128/role/ScheduleShareholderFees20141 column dei_LegalEntityAxis compact ck0000804239_S000026000Member row primary compact * ~ ~ http://seic.com/20130128/role/ScheduleAnnualFundOperatingExpenses20142 column dei_LegalEntityAxis compact ck0000804239_S000026000Member row primary compact * ~ ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) The Fund incurred Acquired Fund Fees and Expenses (AFFE) during the most recent fiscal year, and therefore the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus). SHAREHOLDER FEES (fees paid directly from your investment) Performance Information As of January 31, 2013, Class I Shares of the Fund had not commenced operations and did not have a performance history. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for each calendar year since inception and by showing how the Fund's average annual returns for 1 year, and since the Fund's inception, compare with those of a broad measure of market performance. Since Class I Shares are invested in the same portfolio of securities, return for Class I Shares will be substantially similar to those of Class A Shares, shown here, and will differ only to the extent that Class I Shares have higher expenses. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. For current performance information, please call 1-800-DIAL-SEI. 0.1326 -0.0013 0.1615 ~ http://seic.com/20130128/role/ScheduleAnnualTotalReturnsBarChart20144 column dei_LegalEntityAxis compact ck0000804239_S000026000Member row primary compact * ~ Best Quarter: 0.1391 2012-03-31 Worst Quarter: -0.1519 2011-09-30 Best Quarter: 13.91% (03/31/12)  Worst Quarter: -15.19% (09/30/11) Average Annual Total Returns (for the periods ended December 31, 2012) After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. 0.1615 0.1072 Class A Return Before Taxes 0.1496 0.0954 Class A Return After Taxes on Distributions 0.1180 0.0893 Class A Return After Taxes on Distributions and Sale of Fund Shares 0.1642 0.1224 Russell 1000 Index Return (reflects no deduction for fees, expenses or taxes) 2009-09-30 2009-09-30 ~ http://seic.com/20130128/role/ScheduleAverageAnnualReturnsTransposed20145 column dei_LegalEntityAxis compact ck0000804239_S000026000Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. As of January 31, 2013, Class I Shares of the Fund had not commenced operations and did not have a performance history. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for each calendar year since inception and by showing how the Fund's average annual returns for 1 year, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. (reflects no deduction for fees, expenses or taxes) Since Class I Shares are invested in the same portfolio of securities, return for Class I Shares will be substantially similar to those of Class A Shares, shown here, and will differ only to the extent that Class I Shares have higher expenses. 1-800-DIAL-SEI. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. SIMT LARGE CAP VALUE FUND Principal Investment Strategies Under normal circumstances, the Large Cap Value Fund will invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in equity securities of large companies, including exchange-traded funds (ETFs) and American depositary receipts (ADRs). For purposes of this Fund, a large company is a company with a market capitalization in the range of companies in the Russell 1000 Value Index (between $317.20 million and $394.60 billion as of December 31, 2012) at the time of purchase. The market capitalization range and the composition of the Russell 1000 Value Index are subject to change. The Fund may also, to a lesser extent, invest in common and preferred stocks of small capitalization companies. The Fund may invest up to 20% of its assets in foreign securities. The Fund uses a multi-manager approach, relying on a number of sub-advisers (each, a Sub-Adviser and collectively, the Sub-Advisers) with differing investment philosophies to manage portions of the Fund's portfolio under the general supervision of SEI Investments Management Corporation (SIMC), the Fund's adviser. In managing its portion of the Fund's assets, each Sub-Adviser selects stocks they believe are attractively valued in light of fundamental characteristics such as earnings, capital structure and/or return on invested capital. Principal Risks Depositary Receipts Risk — Depositary receipts, such as ADRs, are certificates evidencing ownership of shares of a foreign issuer that are issued by depositary banks and generally trade on an established market. Depositary receipts are subject to many of the risks associated with investing directly in foreign securities, including, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. Equity Market Risk — The risk that stock prices will fall over short or extended periods of time. Exchange-Traded Funds (ETFs) Risk — The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the ETF is designed to track, although lack of liquidity in an ETF could result in its value being more volatile than the underlying portfolio securities. Foreign Investment Risk — The risk that non-U.S. securities may be subject to additional risks due to, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. Investment Style Risk — The risk that large capitalization securities may underperform other segments of the equity markets or the equity markets as a whole. Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the Fund would like. The Fund may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance. Small Capitalization Risk — Smaller capitalization companies in which the Fund invests may be more vulnerable to adverse business or economic events than larger, more established companies. In particular, small capitalization companies may have limited product lines, markets and financial resources and may depend upon a relatively small management group. Therefore, small capitalization stocks may be more volatile than those of larger companies. Small capitalization stocks may be traded over-the-counter or listed on an exchange. Loss of money is a risk of investing in the Fund. Loss of money is a risk of investing in the Fund. Investment Goal Long-term growth of capital and income. EXAMPLE This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. 126 393 681 1500 ~ http://seic.com/20130128/role/ScheduleExpenseExampleTransposed20150 column dei_LegalEntityAxis compact ck0000804239_S000006674Member row primary compact * ~ Although your actual costs may be higher or lower, based on these assumptions your costs would be: PORTFOLIO TURNOVER The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 37% of the average value of its portfolio. 0.37 Fees and Expenses This table describes the fees and expenses that you may pay if you buy and hold Fund shares. -0.0050 0.0035 0.0000 0.0089 0.0124 ~ http://seic.com/20130128/role/ScheduleShareholderFees20148 column dei_LegalEntityAxis compact ck0000804239_S000006674Member row primary compact * ~ ~ http://seic.com/20130128/role/ScheduleAnnualFundOperatingExpenses20149 column dei_LegalEntityAxis compact ck0000804239_S000006674Member row primary compact * ~ ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) The Fund incurred Acquired Fund Fees and Expenses (AFFE) during the most recent fiscal year, and therefore the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus). SHAREHOLDER FEES (fees paid directly from your investment) Performance Information The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. For current performance information, please call 1-800-DIAL-SEI. 0.2914 0.1473 0.0698 0.2087 -0.0207 -0.3714 0.1823 0.1433 -0.0030 0.1569 ~ http://seic.com/20130128/role/ScheduleAnnualTotalReturnsBarChart20151 column dei_LegalEntityAxis compact ck0000804239_S000006674Member row primary compact * ~ Best Quarter: 0.1715 2003-06-30 Worst Quarter: -0.2073 2008-12-31 Best Quarter: 17.15% (06/30/03)  Worst Quarter: -20.73% (12/31/08) Average Annual Total Returns (for the periods ended December 31, 2012) The Fund's Class I Shares commenced operations on August 6, 2001. Therefore, the Fund's average annual total returns for the periods prior to that time are based on the average annual total returns of the Class A Shares, adjusted for the higher expenses of the Class I Shares. The Fund's actual inception date is April 20, 1987, but between April 20, 1987 and October 3, 1994, the Fund was advised by a different investment adviser. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. 0.1569 -0.0040 0.0628 0.0777 Class I Return Before Taxes 0.1548 -0.0064 0.0562 0.0658 Class I Return After Taxes on Distributions 0.1047 -0.0038 0.0546 0.0641 Class I Return After Taxes on Distributions and Sale of Fund Shares 0.1751 0.0059 0.0738 0.0898 Russell 1000 Value Index Return (reflects no deduction for fees, expenses or taxes) 1994-10-03 1994-10-31 ~ http://seic.com/20130128/role/ScheduleAverageAnnualReturnsTransposed20152 column dei_LegalEntityAxis compact ck0000804239_S000006674Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. (reflects no deduction for fees, expenses or taxes) 1-800-DIAL-SEI. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. SIMT LARGE CAP GROWTH FUND Principal Investment Strategies Under normal circumstances, the Large Cap Growth Fund will invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in equity securities of large companies, including exchange-traded funds (ETFs) and American depositary receipts (ADRs). For purposes of this Fund, a large company is a company with a market capitalization in the range of companies in the Russell 1000 Growth Index (between $336.60 million and $499.80 billion as of December 31, 2012) at the time of purchase. The market capitalization range and the composition of the Russell 1000 Growth Index are subject to change. The Fund may also, to a lesser extent, invest in common and preferred stocks of small capitalization companies. The Fund may invest up to 20% of its assets in foreign securities. The Fund uses a multi-manager approach, relying on a number of sub-advisers (each, a Sub-Adviser and collectively, the Sub-Advisers) with differing investment approaches to manage portions of the Fund's portfolio under the general supervision of SEI Investments Management Corporation (SIMC), the Fund's adviser. In managing its portion of the Fund's assets, each Sub-Adviser selects stocks they believe have attractive growth and appreciation potential in light of such characteristics as revenue and earnings growth, expectations from sell-side analysts and relative valuation. Principal Risks Depositary Receipts Risk — Depositary receipts, such as ADRs, are certificates evidencing ownership of shares of a foreign issuer that are issued by depositary banks and generally trade on an established market. Depositary receipts are subject to many of the risks associated with investing directly in foreign securities, including, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. Equity Market Risk — The risk that stock prices will fall over short or extended periods of time. Exchange-Traded Funds (ETFs) Risk — The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the ETF is designed to track, although lack of liquidity in an ETF could result in its value being more volatile than the underlying portfolio securities. Foreign Investment Risk — The risk that non-U.S. securities may be subject to additional risks due to, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. Investment Style Risk — The risk that large capitalization securities may underperform other segments of the equity markets or the equity markets as a whole. Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the Fund would like. The Fund may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance. Portfolio Turnover Risk — Due to its investment strategy, the Fund may buy and sell securities frequently. This may result in higher transaction costs and additional capital gains tax liabilities. Small Capitalization Risk — Smaller capitalization companies in which the Fund invests may be more vulnerable to adverse business or economic events than larger, more established companies. In particular, small capitalization companies may have limited product lines, markets and financial resources and may depend upon a relatively small management group. Therefore, small capitalization stocks may be more volatile than those of larger companies. Small capitalization stocks may be traded over-the-counter or listed on an exchange. Loss of money is a risk of investing in the Fund. Loss of money is a risk of investing in the Fund. Investment Goal Capital appreciation. EXAMPLE This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. 131 409 708 1556 ~ http://seic.com/20130128/role/ScheduleExpenseExampleTransposed20157 column dei_LegalEntityAxis compact ck0000804239_S000006671Member row primary compact * ~ Although your actual costs may be higher or lower, based on these assumptions your costs would be: PORTFOLIO TURNOVER The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 88% of the average value of its portfolio. 0.88 Fees and Expenses This table describes the fees and expenses that you may pay if you buy and hold Fund shares. -0.0050 0.0040 0.0000 0.0089 0.0129 ~ http://seic.com/20130128/role/ScheduleShareholderFees20155 column dei_LegalEntityAxis compact ck0000804239_S000006671Member row primary compact * ~ ~ http://seic.com/20130128/role/ScheduleAnnualFundOperatingExpenses20156 column dei_LegalEntityAxis compact ck0000804239_S000006671Member row primary compact * ~ ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) The Fund incurred Acquired Fund Fees and Expenses (AFFE) during the most recent fiscal year, and therefore the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus). SHAREHOLDER FEES (fees paid directly from your investment) Performance Information The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. For current performance information, please call 1-800-DIAL-SEI. 0.2499 0.0726 0.0658 0.0669 0.1193 -0.4106 0.3741 0.1466 0.0041 0.1585 ~ http://seic.com/20130128/role/ScheduleAnnualTotalReturnsBarChart20158 column dei_LegalEntityAxis compact ck0000804239_S000006671Member row primary compact * ~ 16.28% (06/30/09) 0.1628 2009-06-30 Worst Quarter: -0.2426 2008-12-31 Best Quarter: 16.28% (06/30/09)  Worst Quarter: -24.26% (12/31/08) Average Annual Total Returns (for the periods ended December 31, 2012) The Fund's Class I Shares commenced operations on August 6, 2001. Therefore, the Fund's average annual total returns for the periods prior to that time are based on the average annual total returns of the Class A Shares, adjusted for the higher expenses of the Class I Shares. The Fund's Class A Shares commenced operations on December 20, 1994. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. 0.1585 0.0156 0.0631 0.0657 Class I Return Before Taxes 0.1583 0.0152 0.0628 0.0615 Class I Return After Taxes on Distributions 0.1033 0.0132 0.0555 0.0568 Class I Return After Taxes on Distributions and Sale of Fund Shares 0.1526 0.0312 0.0752 0.0761 Russell 1000 Growth Index Return (reflects no deduction for fees, expenses or taxes) 1994-12-20 1994-12-31 ~ http://seic.com/20130128/role/ScheduleAverageAnnualReturnsTransposed20159 column dei_LegalEntityAxis compact ck0000804239_S000006671Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. (reflects no deduction for fees, expenses or taxes) 1-800-DIAL-SEI. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. SIMT S&P 500 Index Fund Principal Investment Strategies The S&P 500 Index Fund invests substantially all of its assets in securities listed in the S&P 500 Index, which is composed of approximately 500 leading U.S. publicly traded companies from a broad range of industries (mostly common stocks). The Fund generally gives the same weight to a given stock as the S&P 500 Index does. In seeking to replicate the performance of the S&P 500 Index, the Fund may also invest in exchange-traded funds (ETFs), American depositary receipts (ADRs) and real estate investment trusts (REITs). The Fund may invest a portion of its assets in securities of companies located in developed foreign countries and securities of small capitalization companies. The Fund's ability to replicate the performance of the S&P 500 Index will depend to some extent on the size and timing of cash flows into and out of the Fund, as well as on the level of the Fund's expenses. The Fund's sub-adviser (the Sub-Adviser) selects the Fund's securities under the general supervision of SEI Investments Management Corporation (SIMC), the Fund's adviser, but the Sub-Adviser makes no attempt to "manage" the Fund in the traditional sense (i.e., by using economic, market or financial analyses). Instead, the Sub-Adviser purchases a basket of securities that includes most of the companies in the S&P 500 Index. However, the Sub-Adviser may sell an investment if the merit of the investment has been substantially impaired by extraordinary events or adverse financial conditions. Principal Risks Depositary Receipts Risk — Depositary receipts, such as ADRs, are certificates evidencing ownership of shares of a foreign issuer that are issued by depositary banks and generally trade on an established market. Depositary receipts are subject to many of the risks associated with investing directly in foreign securities, including, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. Equity Market Risk — The risk that stock prices will fall over short or extended periods of time. Exchange-Traded Funds (ETFs) Risk — The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the ETF is designed to track, although lack of liquidity in an ETF could result in its value being more volatile than the underlying portfolio securities. Foreign Investment Risk — The risk that non-U.S. securities may be subject to additional risks due to, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. Investment Style Risk — The risk that the Fund's investment approach, which attempts to replicate the performance of the S&P 500 Index, may underperform other segments of the equity markets or the equity markets as a whole. Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the Fund would like. The Fund may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance. REITs Risk — REITs are trusts that invest primarily in commercial real estate or real estate-related loans. The Fund's investments in REITs will be subject to the risks associated with the direct ownership of real estate. Risks commonly associated with the direct ownership of real estate include fluctuations in the value of underlying properties, defaults by borrowers or tenants, changes in interest rates and risks related to general or local economic conditions. Some REITs may have limited diversification and may be subject to risks inherent in financing a limited number of properties. Small Capitalization Risk — Smaller capitalization companies in which the Fund invests may be more vulnerable to adverse business or economic events than larger, more established companies. In particular, small capitalization companies may have limited product lines, markets and financial resources and may depend upon a relatively small management group. Therefore, small capitalization stocks may be more volatile than those of larger companies. Small capitalization stocks may be traded over-the-counter or listed on an exchange. Tracking Error Risk — The risk that the Fund's performance may vary substantially from the performance of the benchmark index it tracks as a result of cash flows, Fund expenses, imperfect correlation between the Fund's and benchmark's investments and other factors. Loss of money is a risk of investing in the Fund. Loss of money is a risk of investing in the Fund. Investment Goal Investment results that correspond to the aggregate price and dividend performance of the securities in the S&P 500 Index. EXAMPLE This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. 81 252 439 978 ~ http://seic.com/20130128/role/ScheduleExpenseExampleTransposed20164 column dei_LegalEntityAxis compact ck0000804239_S000018490Member row primary compact * ~ Although your actual costs may be higher or lower, based on these assumptions your costs would be: PORTFOLIO TURNOVER The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 18% of the average value of its portfolio. 0.18 Fees and Expenses This table describes the fees and expenses that you may pay if you buy and hold Fund shares. -0.0015 0.0003 0.0000 0.0076 0.0079 ~ http://seic.com/20130128/role/ScheduleShareholderFees20162 column dei_LegalEntityAxis compact ck0000804239_S000018490Member row primary compact * ~ ~ http://seic.com/20130128/role/ScheduleAnnualFundOperatingExpenses20163 column dei_LegalEntityAxis compact ck0000804239_S000018490Member row primary compact * ~ ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) SHAREHOLDER FEES (fees paid directly from your investment) Performance Information The S&P 500 Index Fund is the successor to SEI Index Funds' S&P 500 Index Fund (the Former S&P 500 Index Fund) and the Former S&P 500 Index Fund's performance and financial history. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. For current performance information, please call 1-800-DIAL-SEI. The Fund's Class I Shares commenced operations on September 17, 2007. Therefore, the performance information prior to September 16, 2007 is based on the performance of Class I Shares of the Former S&P 500 Index Fund. 0.2788 0.1016 0.0419 0.1508 0.0491 -0.3758 0.2590 0.1457 0.0154 0.1532 ~ http://seic.com/20130128/role/ScheduleAnnualTotalReturnsBarChart20165 column dei_LegalEntityAxis compact ck0000804239_S000018490Member row primary compact * ~ Best Quarter: 0.1581 2009-06-30 Worst Quarter: -0.2223 2008-12-31 Best Quarter: 15.81% (06/30/09)  Worst Quarter: -22.23% (12/31/08) Average Annual Total Returns (for the periods ended December 31, 2012) The Fund's average annual total returns for the periods prior to September 16, 2007 are based on the performance of Class I Shares of the Former S&P 500 Index Fund. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. 0.1532 0.0106 0.0645 0.0605 Class I Return Before Taxes 0.1505 0.0075 0.0603 0.0552 Class I Return After Taxes on Distributions 0.1027 0.0082 0.0560 0.0517 Class I Return After Taxes on Distributions and Sale of Fund Shares 0.1600 0.0166 0.0710 0.0681 S&P 500 Index Return (reflects no deduction for fees, expenses or taxes) 1996-02-29 1996-02-28 ~ http://seic.com/20130128/role/ScheduleAverageAnnualReturnsTransposed20166 column dei_LegalEntityAxis compact ck0000804239_S000018490Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. (reflects no deduction for fees, expenses or taxes) 1-800-DIAL-SEI. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. SIMT Small Cap Fund Principal Investment Strategies Under normal circumstances, the Small Cap Fund will invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in equity securities (both common and preferred stocks) of small companies, including exchange-traded funds (ETFs) based on small capitalization indices and securities of real estate investment trusts (REITs). For purposes of this Fund, a small company is a company with a market capitalization in the range of companies in the Russell 2000 Index (between $2.70 million and $4.70 billion as of December 31, 2012) or the S&P SmallCap 600 Index (between $61.10 million and $3.80 billion as of December 31, 2012), each as determined at the time of purchase. The market capitalization range and the composition of both the Russell 2000 Index and the S&P SmallCap 600 Index are subject to change. The Fund may also invest in warrants and, to a lesser extent, and securities of large capitalization companies. The Fund uses a multi-manager approach, relying upon a number of sub-advisers (each, a Sub-Adviser and collectively, the Sub-Advisers) with differing investment philosophies to manage portions of the Fund's portfolio under the general supervision of SEI Investments Management Corporation (SIMC), the Fund's adviser. Each Sub-Adviser, in managing its portion of the Fund's assets, generally applies a growth-oriented, a value-oriented or a blended approach to selecting investments. Growth-oriented managers generally select stocks they believe have attractive growth and appreciation potential in light of such characteristics as revenue and earnings growth, expectations from sell side-analysts and relative valuation, while value-oriented managers generally select stocks they believe are attractively valued in light of fundamental characteristics such as earnings, capital structure and/or return on invested capital. Principal Risks Equity Market Risk — The risk that stock prices will fall over short or extended periods of time. Exchange-Traded Funds (ETFs) Risk — The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the ETF is designed to track, although lack of liquidity in an ETF could result in its value being more volatile than the underlying portfolio securities. Investment Style Risk — The risk that small capitalization securities may underperform other segments of the equity markets or the equity markets as a whole. Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the Fund would like. The Fund may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance. Portfolio Turnover Risk — Due to its investment strategy, the Fund may buy and sell securities frequently. This may result in higher transaction costs and additional capital gains tax liabilities. REITs Risk — REITs are trusts that invest primarily in commercial real estate or real estate-related loans. The Fund's investments in REITs will be subject to the risks associated with the direct ownership of real estate. Risks commonly associated with the direct ownership of real estate include fluctuations in the value of underlying properties, defaults by borrowers or tenants, changes in interest rates and risks related to general or local economic conditions. Some REITs may have limited diversification and may be subject to risks inherent in financing a limited number of properties. Small Capitalization Risk — Smaller capitalization companies in which the Fund invests may be more vulnerable to adverse business or economic events than larger, more established companies. In particular, small capitalization companies may have limited product lines, markets and financial resources and may depend upon a relatively small management group. Therefore, small capitalization stocks may be more volatile than those of larger companies. Small capitalization stocks may be traded over the counter-or-listed on an exchange. Loss of money is a risk of investing in the Fund. Loss of money is a risk of investing in the Fund. Investment Goal Capital appreciation. EXAMPLE This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. 157 486 839 1834 ~ http://seic.com/20130128/role/ScheduleExpenseExampleTransposed20171 column dei_LegalEntityAxis compact ck0000804239_S000026001Member row primary compact * ~ Although your actual costs may be higher or lower, based on these assumptions your costs would be: PORTFOLIO TURNOVER The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 114% of the average value of its portfolio. 1.14 Fees and Expenses This table describes the fees and expenses that you may pay if you buy and hold Fund shares. -0.0100 0.0065 0.0000 0.0088 0.0001 0.0154 ~ http://seic.com/20130128/role/ScheduleShareholderFees20169 column dei_LegalEntityAxis compact ck0000804239_S000026001Member row primary compact * ~ ~ http://seic.com/20130128/role/ScheduleAnnualFundOperatingExpenses20170 column dei_LegalEntityAxis compact ck0000804239_S000026001Member row primary compact * ~ ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) The Fund incurred AFFE during the most recent fiscal year, and therefore the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus). SHAREHOLDER FEES (fees paid directly from your investment) Performance Information As of January 31, 2013, Class I Shares of the Fund had not commenced operations and did not have a performance history. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for each calendar year since inception and by showing how the Fund's average annual returns for 1 year, and since the Fund's inception, compare with those of a broad measure of market performance. Since Class I Shares are invested in the same portfolio of securities, return for Class I Shares will be substantially similar to those of Class A Shares, shown here, and will differ only to the extent that Class I Shares have higher expenses. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. For current performance information, please call 1-800-DIAL-SEI. 0.2322 -0.0512 0.1314 ~ http://seic.com/20130128/role/ScheduleAnnualTotalReturnsBarChart20172 column dei_LegalEntityAxis compact ck0000804239_S000026001Member row primary compact * ~ Best Quarter: 0.1632 2011-12-31 Worst Quarter: -0.2312 2011-09-30 Best Quarter: 16.32% (12/31/11)  Worst Quarter: -23.12 (09/30/11) Average Annual Total Returns (for the periods ended December 31, 2012) After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. 0.1314 0.1025 Class A Return Before Taxes 0.1222 0.0814 Class A Return After Taxes on Distributions 0.0969 0.0806 Class A Return After Taxes on Distributions and Sale of Fund Shares 0.1635 0.1256 Russell 2000 Index Return (reflects no deduction for fees, expenses or taxes) 2009-09-30 2009-09-30 ~ http://seic.com/20130128/role/ScheduleAverageAnnualReturnsTransposed20173 column dei_LegalEntityAxis compact ck0000804239_S000026001Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. As of January 31, 2013, Class I Shares of the Fund had not commenced operations and did not have a performance history. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for each calendar year since inception and by showing how the Fund's average annual returns for 1 year, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. (reflects no deduction for fees, expenses or taxes) Since Class I Shares are invested in the same portfolio of securities, return for Class I Shares will be substantially similar to those of Class A Shares, shown here, and will differ only to the extent that Class I Shares have higher expenses. 1-800-DIAL-SEI. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. SIMT SMALL CAP VALUE FUND Principal Investment Strategies Under normal circumstances, the Small Cap Value Fund will invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in equity securities of small companies, including exchange-traded funds (ETFs). The Fund will invest primarily in common stocks of U.S. companies with market capitalizations in the range of companies in the Russell 2000 Index (between $2.70 million and $4.70 billion as of December 31, 2012) or the S&P SmallCap 600 Index (between $61.10 million and $3.80 billion as of December 31, 2012), each as determined at the time of purchase. The market capitalization range and the composition of the Russell 2000 Index and the S&P SmallCap 600 Index are subject to change. The Fund's investments in equity securities may include common and preferred stocks, warrants and, to a lesser extent, real estate investment trusts (REITs) and securities of large capitalization companies. The Fund uses a multi-manager approach, relying upon a number of sub-advisers (each, a Sub-Adviser and collectively, the Sub-Advisers) to manage portions of the Fund's portfolio under the general supervision of SEI Investments Management Corporation (SIMC), the Fund's adviser. In managing its portion of the Fund's assets, each Sub-Adviser selects stocks it believes are attractively valued in light of fundamental characteristics such as earnings, capital structure and/or return on invested capital, among other factors. Principal Risks Equity Market Risk — The risk that stock prices will fall over short or extended periods of time. Exchange-Traded Funds (ETFs) Risk — The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the ETF is designed to track, although lack of liquidity in an ETF could result in its value being more volatile than the underlying portfolio securities. Investment Style Risk — The risk that small capitalization securities may underperform other segments of the equity markets or the equity markets as a whole. Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the Fund would like. The Fund may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance. Portfolio Turnover Risk — Due to its investment strategy, the Fund may buy and sell securities frequently. This may result in higher transaction costs and additional capital gains tax liabilities. REITs Risk — REITs are trusts that invest primarily in commercial real estate or real estate-related loans. The Fund's investments in REITs will be subject to the risks associated with the direct ownership of real estate. Risks commonly associated with the direct ownership of real estate include fluctuations in the value of underlying properties, defaults by borrowers or tenants, changes in interest rates and risks related to general or local economic conditions. Some REITs may have limited diversification and may be subject to risks inherent in financing a limited number of properties. Small Capitalization Risk — Smaller capitalization companies in which the Fund invests may be more vulnerable to adverse business or economic events than larger, more established companies. In particular, small capitalization companies may have limited product lines, markets and financial resources and may depend upon a relatively small management group. Therefore, small capitalization stocks may be more volatile than those of larger companies. Small capitalization stocks may be traded over-the-counter or listed on an exchange. Loss of money is a risk of investing in the Fund. Loss of money is a risk of investing in the Fund. Investment Goal Capital appreciation. EXAMPLE This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. 157 486 839 1834 ~ http://seic.com/20130128/role/ScheduleExpenseExampleTransposed20178 column dei_LegalEntityAxis compact ck0000804239_S000006672Member row primary compact * ~ Although your actual costs may be higher or lower, based on these assumptions your costs would be: PORTFOLIO TURNOVER The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 53% of the average value of its portfolio. 0.53 Fees and Expenses This table describes the fees and expenses that you may pay if you buy and hold Fund shares. -0.0100 0.0065 0.0000 0.0089 0.0154 ~ http://seic.com/20130128/role/ScheduleShareholderFees20176 column dei_LegalEntityAxis compact ck0000804239_S000006672Member row primary compact * ~ ~ http://seic.com/20130128/role/ScheduleAnnualFundOperatingExpenses20177 column dei_LegalEntityAxis compact ck0000804239_S000006672Member row primary compact * ~ ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) The Fund incurred Acquired Fund Fees and Expenses (AFFE) during the most recent fiscal year, and therefore the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus). SHAREHOLDER FEES (fees paid directly from your investment) Performance Information The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. For current performance information, please call 1-800-DIAL-SEI. 0.4234 0.2271 0.0649 0.1988 -0.0702 -0.3435 0.3064 0.2384 -0.0556 0.1512 ~ http://seic.com/20130128/role/ScheduleAnnualTotalReturnsBarChart20179 column dei_LegalEntityAxis compact ck0000804239_S000006672Member row primary compact * ~ Best Quarter: 0.2242 2009-06-30 Worst Quarter: -0.2780 2008-12-31 Best Quarter: 22.42% (06/30/09)  Worst Quarter: -27.80% (12/31/08) Average Annual Total Returns (for the periods ended December 31, 2012) The Fund's Class I Shares commenced operations on February 11, 2002. Therefore, the Fund's average annual total returns for the periods prior to that time are based on the average annual total returns of the Class A Shares, adjusted for the higher expenses of the Class I Shares. The Fund's Class A Shares commenced operations on December 20, 1994. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. 0.1512 0.0292 0.0912 0.0951 Class I Return Before Taxes 0.1498 0.0277 0.0787 0.0794 Class I Return After Taxes on Distributions 0.1002 0.0245 0.0764 0.0773 Class I Return After Taxes on Distributions and Sale of Fund Shares 0.1805 0.0355 0.0950 0.1015 Russell 2000 Value Index Return (reflects no deduction for fees, expenses or taxes) 1994-12-20 1994-12-31 ~ http://seic.com/20130128/role/ScheduleAverageAnnualReturnsTransposed20180 column dei_LegalEntityAxis compact ck0000804239_S000006672Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. (reflects no deduction for fees, expenses or taxes) 1-800-DIAL-SEI. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. SIMT SMALL CAP GROWTH FUND Principal Investment Strategies Under normal circumstances, the Small Cap Growth Fund will invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in equity securities of small companies, including exchange-traded funds (ETFs). The Fund will invest primarily in common stocks of U.S. companies with market capitalizations in the range of companies in the Russell 2000 Index (between $2.70 million and $4.70 billion as of December 31, 2012) or the S&P SmallCap 600 Index (between $61.10 million and $3.80 billion as of December 31, 2012), each as determined at the time of purchase. The market capitalization range and the composition of the Russell 2000 Index and the S&P SmallCap 600 Index are subject to change. The Fund's investments in equity securities may include common and preferred stocks, warrants and, to a lesser extent, real estate investments trusts (REITs) and securities of large capitalization companies. The Fund uses a multi-manager approach, relying upon a number of sub-advisers (each, a Sub-Adviser and collectively, the Sub-Advisers) to manage portions of the Fund's portfolio under the general supervision of SEI Investments Management Corporation (SIMC), the Fund's adviser. In managing its portion of the Fund's assets, each Sub-Adviser selects stocks it believes have attractive growth and appreciation potential in light of such characteristics as revenue and earnings growth, expectations from sell-side analysts and relative valuation, among other factors. Principal Risks Equity Market Risk — The risk that stock prices will fall over short or extended periods of time. Exchange-Traded Funds (ETFs) Risk — The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the ETF is designed to track, although lack of liquidity in an ETF could result in its value being more volatile than the underlying portfolio securities. Investment Style Risk — The risk that small capitalization securities may underperform other segments of the equity markets or the equity markets as a whole. Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the Fund would like. The Fund may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance. Portfolio Turnover Risk — Due to its investment strategy, the Fund may buy and sell securities frequently. This may result in higher transaction costs and additional capital gains tax liabilities. REITs Risk — REITs are trusts that invest primarily in commercial real estate or real estate-related loans. The Fund's investments in REITs will be subject to the risks associated with the direct ownership of real estate. Risks commonly associated with the direct ownership of real estate include fluctuations in the value of underlying properties, defaults by borrowers or tenants, changes in interest rates and risks related to general or local economic conditions. Some REITs may have limited diversification and may be subject to risks inherent in financing a limited number of properties. Small Capitalization Risk — Smaller capitalization companies in which the Fund invests may be more vulnerable to adverse business or economic events than larger, more established companies. In particular, small capitalization companies may have limited product lines, markets and financial resources and may depend upon a relatively small management group. Therefore, small capitalization stocks may be more volatile than those of larger companies. Small capitalization stocks may be traded over-the-counter or listed on an exchange. Loss of money is a risk of investing in the Fund. Loss of money is a risk of investing in the Fund. Investment Goal Long-term capital appreciation. EXAMPLE This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. 157 486 839 1834 ~ http://seic.com/20130128/role/ScheduleExpenseExampleTransposed20185 column dei_LegalEntityAxis compact ck0000804239_S000006670Member row primary compact * ~ Although your actual costs may be higher or lower, based on these assumptions your costs would be: PORTFOLIO TURNOVER The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 110% of the average value of its portfolio. 1.10 Fees and Expenses This table describes the fees and expenses that you may pay if you buy and hold Fund shares. -0.0100 0.0065 0.0000 0.0089 0.0154 ~ http://seic.com/20130128/role/ScheduleShareholderFees20183 column dei_LegalEntityAxis compact ck0000804239_S000006670Member row primary compact * ~ ~ http://seic.com/20130128/role/ScheduleAnnualFundOperatingExpenses20184 column dei_LegalEntityAxis compact ck0000804239_S000006670Member row primary compact * ~ ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) The Fund incurred Acquired Fund Fees and Expenses (AFFE) during the most recent fiscal year, and therefore the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus). SHAREHOLDER FEES (fees paid directly from your investment) Performance Information The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. For current performance information, please call 1-800-DIAL-SEI. 0.5548 0.0925 0.0323 0.1105 0.0161 -0.4792 0.3786 0.2385 -0.0279 0.1249 ~ http://seic.com/20130128/role/ScheduleAnnualTotalReturnsBarChart20186 column dei_LegalEntityAxis compact ck0000804239_S000006670Member row primary compact * ~ Best Quarter: 0.2734 2003-06-30 Worst Quarter: -0.2969 2008-12-31 Best Quarter: 27.34% (06/30/03)  Worst Quarter: -29.69% (12/31/08) Average Annual Total Returns (for the periods ended December 31, 2012) The Fund's Class I Shares commenced operations on August 6, 2001. Therefore, the Fund's average annual total returns for the periods prior to that time are based on the average annual total returns of the Class A Shares, adjusted for the higher expenses of the Class I Shares. The Fund's Class A Shares commenced operations on April 20, 1992. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. 0.1249 -0.0056 0.0676 0.0790 Class I Return Before Taxes 0.1245 -0.0057 0.0660 0.0644 Class I Return After Taxes on Distributions 0.0814 -0.0048 0.0594 0.0627 Class I Return After Taxes on Distributions and Sale of Fund Shares 0.1459 0.0349 0.0980 0.0650 Russell 2000 Growth Index Return (reflects no deduction for fees, expenses or taxes) 1992-04-20 1992-04-30 ~ http://seic.com/20130128/role/ScheduleAverageAnnualReturnsTransposed20187 column dei_LegalEntityAxis compact ck0000804239_S000006670Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. (reflects no deduction for fees, expenses or taxes) 1-800-DIAL-SEI. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. SIMT MID CAP FUND Principal Investment Strategies Under normal circumstances, the Mid-Cap Fund will invest at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in equity securities of medium-sized companies. The Fund will invest primarily in common stocks of U.S. companies with market capitalizations in the range of companies in the Russell Midcap Index (between approximately $317.20 million and $21.40 billion as of December 31, 2012) at the time of purchase. The market capitalization range and the composition of the Russell Midcap Index are subject to change. The Fund's investments in equity securities may include common and preferred stocks, warrants and, to a lesser extent, securities of small capitalization companies, real estate investment trusts (REITs), exchange-traded funds (ETFs) and securities of large capitalization companies. The Fund uses multiple sub-advisers (each, a Sub-Adviser and collectively, the Sub-Advisers) to manage the Fund's portfolio under the general supervision of SEI Investments Management Corporation (SIMC), the Fund's adviser. In managing the Fund's assets, the Sub-Advisers select stocks of companies that have low price-earnings and price-book ratios, but that also have high sustainable growth levels and the probability of high positive earnings revisions. Principal Risks Equity Market Risk — The risk that stock prices will fall over short or extended periods of time. Exchange-Traded Funds (ETFs) Risk — The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the ETF is designed to track, although lack of liquidity in an ETF could result in its value being more volatile than the underlying portfolio securities. Investment Style Risk — The risk that securities of medium capitalization companies may underperform other segments of the equity markets or the equity markets as a whole. Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the Fund would like. The Fund may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance. Portfolio Turnover Risk — Due to its investment strategy, the Fund may buy and sell securities frequently. This may result in higher transaction costs and additional capital gains tax liabilities. REITs Risk — REITs are trusts that invest primarily in commercial real estate or real estate-related loans. The Fund's investments in REITs will be subject to the risks associated with the direct ownership of real estate. Risks commonly associated with the direct ownership of real estate include fluctuations in the value of underlying properties, defaults by borrowers or tenants, changes in interest rates and risks related to general or local economic conditions. Some REITs may have limited diversification and may be subject to risks inherent in financing a limited number of properties. Small and Medium Capitalization Companies Risk — The risk that small and medium capitalization companies in which the Fund invests may be more vulnerable to adverse business or economic events than larger, more established companies. In particular, small and medium capitalization companies may have limited product lines, markets and financial resources and may depend upon a relatively small management group. Therefore, small capitalization and medium capitalization stocks may be more volatile than those of larger companies. Small capitalization and medium capitalization stocks may be traded over-the-counter or listed on an exchange. Loss of money is a risk of investing in the Fund. Loss of money is a risk of investing in the Fund. Investment Goal Long-term capital appreciation. EXAMPLE This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. 132 412 713 1568 ~ http://seic.com/20130128/role/ScheduleExpenseExampleTransposed20192 column dei_LegalEntityAxis compact ck0000804239_S000006675Member row primary compact * ~ Although your actual costs may be higher or lower, based on these assumptions your costs would be: PORTFOLIO TURNOVER The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 81% of the average value of its portfolio. 0.81 Fees and Expenses This table describes the fees and expenses that you may pay if you buy and hold Fund shares. -0.0075 0.0040 0.0000 0.0089 0.0001 0.0130 ~ http://seic.com/20130128/role/ScheduleShareholderFees20190 column dei_LegalEntityAxis compact ck0000804239_S000006675Member row primary compact * ~ ~ http://seic.com/20130128/role/ScheduleAnnualFundOperatingExpenses20191 column dei_LegalEntityAxis compact ck0000804239_S000006675Member row primary compact * ~ ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) The Fund incurred AFFE during the most recent fiscal year, and therefore the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus). SHAREHOLDER FEES (fees paid directly from your investment) Performance Information The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. For current performance information, please call 1-800-DIAL-SEI. The Fund's Class I Shares commenced operations on October 1, 2007. Therefore, performance and average annual total returns for the periods prior to October 1, 2007 are calculated using the performance and average annual total returns of the Fund's Class A Shares, adjusted for the higher expenses of the Class I Shares. The Fund's Class A Shares commenced operations on February 16, 1993. 0.4056 0.2244 0.1443 0.1431 0.0198 -0.4158 0.3307 0.2308 -0.0499 0.1684 ~ http://seic.com/20130128/role/ScheduleAnnualTotalReturnsBarChart20193 column dei_LegalEntityAxis compact ck0000804239_S000006675Member row primary compact * ~ Best Quarter: 0.1948 2009-09-30 Worst Quarter: -0.2559 2008-12-31 Best Quarter: 19.48% (09/30/09)  Worst Quarter: -25.59% (12/31/08) Average Annual Total Returns (for the periods ended December 31, 2012) As noted above, the Fund's Class I Shares commenced operations on October 1, 2007. Therefore, the Fund's average annual total returns for the periods prior to that time are based on the average annual total returns of the Class A Shares, adjusted for the higher expenses of the Class I Shares. The Fund's Class A Shares commenced operations on February 16, 1993. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. 0.1684 0.0122 0.0932 0.0880 Class I Return Before Taxes 0.1676 0.0115 0.0830 0.0735 Class I Return After Taxes on Distributions 0.1105 0.0102 0.0784 0.0711 Class I Return After Taxes on Distributions and Sale of Fund Shares 0.1728 0.0357 0.1065 0.1026 Russell Midcap Index Return (reflects no deduction for fees, expenses or taxes) 1993-02-16 1993-02-28 ~ http://seic.com/20130128/role/ScheduleAverageAnnualReturnsTransposed20194 column dei_LegalEntityAxis compact ck0000804239_S000006675Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing how the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. (reflects no deduction for fees, expenses or taxes) 1-800-DIAL-SEI. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. SIMT US MANAGED VOLATILITY FUND Principal Investment Strategies The U.S. Managed Volatility Fund will typically invest in securities of U.S. companies of all capitalization ranges. These securities may include common stocks, preferred stocks, exchange-traded funds (ETFs) and warrants. The Fund may also, to a lesser extent, invest in American depositary receipts (ADRs) and securities of non-U.S. companies. The Fund uses a multi-manager approach, relying on a number of sub-advisers (each, a Sub-Adviser and collectively, the Sub-Advisers) with differing investment philosophies to manage portions of the Fund's portfolio under the general supervision of SEI Investments Management Corporation (SIMC), the Fund's adviser. The Fund seeks to achieve an absolute return of the broad U.S. equity markets, but with a lower absolute volatility. Over the long term, the Fund seeks to achieve a return similar to that of the Russell 3000 Index, but with a lower level of volatility. However, given that the Fund's investment strategy focuses on absolute return and risk, the Fund's sector and market capitalization exposures will typically vary from the index and may cause significant performance deviations relative to the index over shorter-term periods. The Fund seeks to achieve lower volatility by constructing a portfolio of securities that effectively weighs securities based on their total expected risk and return without regard to market capitalization and industry. Principal Risks American Depositary Receipts (ADRs) Risk — ADRs are certificates evidencing ownership of shares of a foreign issuer that are issued by depositary banks and generally trade on an established market. ADRs are subject to many of the risks associated with investing directly in foreign securities, including, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. Equity Market Risk — The risk that stock prices will fall over short or extended periods of time. Exchange-Traded Funds (ETFs) Risk — The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the ETF is designed to track, although lack of liquidity in an ETF could result in its value being more volatile than the underlying portfolio securities. Foreign Investment Risk — The risk that non-U.S. securities may be subject to additional risks due to, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. Investment Style Risk — The risk that equity securities of U.S. companies of all capitalization ranges may underperform other segments of the equity markets or the equity markets as a whole. Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the Fund would like. The Fund may have to lower the price, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance. Portfolio Turnover Risk — Due to its investment strategy, the Fund may buy and sell securities frequently. This may result in higher transaction costs and additional capital gains tax liabilities. Small and Medium Capitalization Companies Risk — The risk that small and medium capitalization companies in which the Fund invests may be more vulnerable to adverse business or economic events than larger, more established companies. In particular, small and medium capitalization companies may have limited product lines, markets and financial resources and may depend upon a relatively small management group. Therefore, small capitalization and medium capitalization stocks may be more volatile than those of larger companies. Small capitalization and medium capitalization stocks may be traded over-the-counter or listed on an exchange. Loss of money is a risk of investing in the Fund. Loss of money is a risk of investing in the Fund. Investment Goal Capital appreciation with less volatility than the broad U.S. equity markets. EXAMPLE This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. 157 486 839 1834 ~ http://seic.com/20130128/role/ScheduleExpenseExampleTransposed20199 column dei_LegalEntityAxis compact ck0000804239_S000006678Member row primary compact * ~ Although your actual costs may be higher or lower, based on these assumptions your costs would be: PORTFOLIO TURNOVER The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 48% of the average value of its portfolio. 0.48 Fees and Expenses This table describes the fees and expenses that you may pay if you buy and hold Fund shares. -0.0050 0.0065 0.0000 0.0089 0.0154 ~ http://seic.com/20130128/role/ScheduleShareholderFees20197 column dei_LegalEntityAxis compact ck0000804239_S000006678Member row primary compact * ~ ~ http://seic.com/20130128/role/ScheduleAnnualFundOperatingExpenses20198 column dei_LegalEntityAxis compact ck0000804239_S000006678Member row primary compact * ~ ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) The Fund incurred AFFE during the most recent fiscal year, and therefore the operating expenses in this fee table will not correlate to the expense ratio in the Fund's financial statements (or the "Financial Highlights" section in the prospectus). SHAREHOLDER FEES (fees paid directly from your investment) Performance Information The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for each calendar year since inception and by showing how the Fund's average annual returns for 1 and 5 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. For current performance information, please call 1-800-DIAL-SEI. However, the Fund's Class I Shares commenced operations on June 29, 2007. Therefore, performance and average annual total returns for the periods prior to June 29, 2007 are calculated using the performance and average annual total returns of the Fund's Class A Shares, adjusted for the higher expenses of the Class I Shares. The Fund's Class A Shares commenced operations on October 28, 1994. 0.0538 0.1332 0.0790 -0.2929 0.1585 0.1463 0.0944 0.1207 ~ http://seic.com/20130128/role/ScheduleAnnualTotalReturnsBarChart20200 column dei_LegalEntityAxis compact ck0000804239_S000006678Member row primary compact * ~ Best Quarter: 0.1149 2009-09-30 Worst Quarter: -0.2035 2008-12-31 Best Quarter: 11.49% (09/30/09)  Worst Quarter: -20.35% (12/31/08) Average Annual Total Returns (for the periods ended December 31, 2012) As noted above, the Fund's Class I Shares commenced operations on June 29, 2007. Therefore, the Fund's average annual total returns for the periods prior to that time are based on the average annual total returns of the Class A Shares, adjusted for the higher expenses of the Class I Shares. The Fund's Class A Shares commenced operations on October 28, 1994. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. 0.1207 0.0287 0.0599 Class I Return Before Taxes 0.1168 0.0266 0.0549 Class I Return After Taxes on Distributions 0.0837 0.0242 0.0502 Class I Return After Taxes on Distributions and Sale of Fund Shares 0.1642 0.0204 0.0550 Russell 3000 Index Return (reflects no deduction for fees, expenses or taxes) 2004-10-28 2004-10-31 ~ http://seic.com/20130128/role/ScheduleAverageAnnualReturnsTransposed20201 column dei_LegalEntityAxis compact ck0000804239_S000006678Member column rr_PerformanceMeasureAxis compact * row primary compact * ~ After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. The bar chart and the performance table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year for each calendar year since inception and by showing how the Fund's average annual returns for 1 and 5 years, and since the Fund's inception, compare with those of a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. (reflects no deduction for fees, expenses or taxes) 1-800-DIAL-SEI. Your actual after-tax returns will depend on your tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. SIMT GLOBAL MANAGED VOLATILITY FUND Principal Investment Strategies The Global Managed Volatility Fund will typically invest in securities of U.S. and foreign companies of all capitalization ranges. These securities may include common stocks, preferred stocks, warrants, depositary receipts and exchange-traded funds (ETFs). The Fund also may use futures contracts and forward contracts. Under normal circumstances, the Fund will invest in at least three countries outside of the U.S., but will typically invest much more broadly. It is expected that at least 40% of the Fund's assets will be invested in non-U.S. securities. The Fund will invest primarily in companies located in developed countries, but may also invest in companies located in emerging markets. The Fund uses a multi-manager approach, relying on a number of sub-advisers (each, a Sub-Adviser and collectively, the Sub-Advisers) with differing investment philosophies to manage portions of the Fund's portfolio under the general supervision of SEI Investments Management Corporation (SIMC), the Fund's adviser. This approach is intended to manage the risk characteristics of the Fund. The Fund is expected to achieve an absolute return of the broad global equity markets, but with a lower absolute volatility. Over the long term, the Fund is expected to achieve a return similar to that of the MSCI World 100% USD Hedged Index, but with a lower level of volatility. However, given that the Fund's investment strategy focuses on absolute return and risk, the Fund's country, sector and market capitalization exposures will typically vary from the index and may cause significant performance deviations relative to the index over shorter-term periods. The Fund seeks to achieve lower volatility by constructing a portfolio of securities that the Sub-Advisers believe will produce a less volatile return stream to the market. Each Sub-Adviser effectively weighs securities based on their total expected risk and return without regard to market capitalization and industry. In managing the Fund's currency exposure for foreign securities, the Fund may buy and sell futures or forward contracts on currencies for hedging purposes. Principal Risks Credit Risk — The risk that the issuer of a security or the counterparty to a contract will default or otherwise become unable to honor a financial obligation. Currency Risk — As a result of the Fund's investments in securities or other investments denominated in, and/or receiving revenues in, foreign currencies, the Fund will be subject to currency risk. Currency risk is the risk that foreign currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency hedged. In either event, the dollar value of an investment in the Fund would be adversely affected. Depositary Receipts Risk — Depositary receipts, such as American depositary receipts (ADRs), are certificates evidencing ownership of shares of a foreign issuer that are issued by depositary banks and generally trade on an established market. Depositary receipts are subject to many of the risks associated with investing directly in foreign securities, including, among other things, political, social and economic developments abroad, currency movements and different legal, regulatory and tax environments. Derivatives Risk — The Fund's use of futures contracts and forward contracts is subject to market risk, leverage risk, correlation risk and liquidity risk. Leverage risk and liquidity risk are described below. Market risk is the risk that the market value of an investment may move up and down, sometimes rapidly and unpredictably. Correlation risk is the risk that changes in the value of the derivative may not correlate perfectly with the underlying asset, rate or index. The Fund's use of forward contracts is also subject to credit risk and valuation risk. Valuation risk is the risk that the derivative may be difficult to value and/or valued incorrectly. Credit risk is described above. Each of these risks could cause the Fund to lose more than the principal amount invested in a derivative instrument. Equity Market Risk — The risk that stock prices will fall over short or extended periods of time. Exchange-Traded Funds (ETFs) Risk — The risks of owning shares of an ETF generally reflect the risks of owning the underlying securities the ETF is designed to track, although lack of liquidity in an ETF could result in its value being more volatile than the underlying portfolio securities. <f