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Class Y Prospectus | STET TAX-ADVANTAGED INCOME FUND  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading STET TAX-ADVANTAGED INCOME FUND
Objective [Heading] rr_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

Provide the highest level of income possible in a tax efficient manner.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold Fund shares.
Operating Expenses Caption [Text] rr_OperatingExpensesCaption ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading PORTFOLIO TURNOVER
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

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 40% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 40.00%
Expense Example [Heading] rr_ExpenseExampleHeading EXAMPLE
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

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.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Tax-Advantaged Income Fund will invest, under normal circumstances, at least 50% of its net assets in municipal securities, such as bonds, that pay interest that is exempt from federal income tax, including the alternative minimum tax. The principal issuers of these securities are state and local governments and their agencies located in any of the fifty states, as well as in Puerto Rico and other U.S. territories and possessions. The Fund may invest more than 25% of its total assets in bonds of issuers in California and New York. Under most market conditions, a large percentage of the municipal securities in which the Fund invests will be below investment grade (junk bonds), but the Fund, without limitation, may invest in higher rated municipal securities.


To a lesser extent, the Fund will also invest in a full range of preferred stock with an emphasis on preferred securities that, at the time of issuance, are eligible to pay dividends that qualify for certain favorable federal income tax treatment, such as dividends that are treated as qualified dividend income and eligible for the dividends received deduction (in each instance, provided certain requirements and holding periods are satisfied, see "Taxes"). The amount invested in preferred stocks at any one time will depend on the attractiveness of the after-tax income stream produced by the preferred securities and will be less than 50% of the Fund's net assets. It is possible that the Fund could own no preferred securities if municipal securities produce a higher yield on an after-tax basis.


Although the Fund may invest a portion of its assets in securities other than municipal and preferred securities, the Fund will seek to purchase securities that generate income eligible for preferential tax treatment in the hands of shareholders. The Fund may also invest in convertible securities, securities eligible for resale under Rule 144A of the Securities Act of 1933, as amended, and other privately placed securities, debt securities subject to federal income tax, common stock and open and closed-end funds. SEI Investments Management Corporation (SIMC or the Adviser) may directly invest up to 5% of the Fund's assets in closed-end bond funds.


The Fund uses a multi-manager approach to manage the Fund's portfolio under the general supervision of SIMC. Each sub-adviser (each, a Sub-Adviser and collectively, the Sub-Advisers) and, to the extent applicable, SIMC selects securities based on its view on the future direction of interest rates and the shape of the yield curve, as well as its views on credit quality and sector allocation issues. Where possible, each Sub-Adviser and, to the extent applicable, SIMC, will attempt to acquire securities that are underpriced relative to other eligible securities. Each Sub-Adviser and, to the extent applicable, SIMC, will seek to maintain duration of four to eleven years for the Fund's entire portfolio. The Fund may invest in securities subject to the alternative minimum tax or in taxable debt securities.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

Municipal Securities Risk — Municipal securities, like other fixed income securities, rise and fall in value in response to economic and market factors, primarily changes in interest rates, and actual or perceived credit quality. Rising interest rates will generally cause municipal securities to decline in value. Longer-term securities usually respond more sharply to interest rate changes than do shorter-term securities. A municipal security will also lose value if, due to rating downgrades or other factors, there are concerns about the issuer's current or future ability to make principal or interest payments. State and local governments rely on taxes and, to some extent, revenues from private projects financed by municipal securities, to pay interest and principal on municipal debt. Poor statewide or local economic results or changing political sentiments may reduce tax revenues and increase the expenses of municipal issuers, making it more difficult for them to meet their obligations. Actual or perceived erosion of the creditworthiness of municipal issuers may reduce the value of the Fund's holdings. As a result, the Fund will be more susceptible to factors that adversely affect issuers of municipal obligations than a mutual fund that does not have as great a concentration in municipal obligations. Also, there may be economic or political changes that impact the ability of issuers of municipal securities to repay principal and to make interest payments on securities owned by the Fund. Any changes in the financial condition of municipal issuers may also adversely affect the value of the Fund's securities.


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 a low interest rate environment, risks associated with rising rates are heightened. Declines in dealer market-making capacity as a result of structural or regulatory changes could decrease liquidity and/or increase volatility in the fixed income markets. 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. In response to these events, the Fund's value may fluctuate and/or the Fund may experience increased redemptions from shareholders, which may impact the Fund's liquidity or force the Fund to sell securities into a declining or illiquid market.


Credit Risk — The Fund could lose money if the issuer or guarantor of a portfolio security or a counterparty to a contract fails to make timely payment or otherwise honor its obligations. If the Fund purchases securities supported by credit enhancements from banks and other financial institutions, changes in the credit quality of these institutions could cause losses to the Fund and affect its share price.


Interest Rate Risk — The risk that a rise in interest rates will cause a fall in the value of fixed income securities, including U.S. Government securities, in which the Fund invests. 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. A low interest rate environment may present greater interest rate risk, because there may be a greater likelihood of rates increasing and rates may increase more rapidly.


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 generally more volatile than investment grade securities because the prospect for repayment of principal and interest of many of these securities is speculative.


California/New York Investment Risk — To the extent the Fund invests a material portion of its assets in issuers of California or New York municipal securities, the Fund's performance will be affected by the fiscal and economic health of the States of California or New York, their political subdivisions, municipalities, agencies and authorities and political and regulatory developments affecting California or New York municipal issuers.


Convertible and Preferred Securities Risk — Convertible and preferred securities generally have less potential for gain or loss than common stocks. In addition, convertible and preferred securities generally provide yields higher than the underlying common stocks, but generally lower than comparable non-convertible securities. Because of this higher yield, convertible and preferred securities generally sell at a price above their "conversion value," which is the current market value of the stock to be received upon conversion. The difference between this conversion value and the price of convertible and preferred securities will vary over time depending on changes in the value of the underlying common stocks and interest rates. Convertible and preferred securities are also subject to credit risk and are often lower-quality securities.


Investment Company 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. 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.


Private Placements Risk — Investment in privately placed securities may be less liquid than in publicly traded securities. Although these securities may be resold in privately negotiated transactions, the prices realized from these sales could be less than those originally paid by the Fund or less than what may be considered the fair value of such securities. Furthermore, companies whose securities are not publicly traded may not be subject to the disclosure and other investor protection requirements that might be applicable if their securities were publicly traded.


Call Risk — Issuers of callable bonds may call (redeem) securities with higher coupons or interest rates before their maturity dates. The Fund may be forced to reinvest the unanticipated proceeds at lower interest rates, resulting in a decline in the Fund's income. Bonds may be called due to falling interest rates or non-economical circumstances.


Equity Market Risk — The risk that the market value of a security may move up and down, sometimes rapidly and unpredictably. Market risk may affect a single issuer, an industry, a sector or the equity market as a whole.


Extension Risk — The risk that rising interest rates may extend the duration of a fixed income security, typically reducing the security's value.


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 of the security, sell other securities instead or forego an investment opportunity, any of which could have a negative effect on Fund management or performance.


Duration Risk — Longer-term securities in which the Fund may invest are more volatile than shorter-term securities. A portfolio with a longer average portfolio duration is more sensitive to changes in interest rates than a portfolio with a shorter average portfolio duration.


Prepayment Risk — The risk that, in a declining interest rate environment, 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.


Taxation Risk — In order to pay tax-exempt interest, tax-exempt securities must meet certain legal requirements. Failure to meet such requirements may cause the interest received and distributed by the Fund to shareholders to be taxable. Changes or proposed changes in federal tax laws may cause the prices of tax-exempt securities to fall. While the Fund intends, under normal circumstances, to invest at least 50% of its net assets in municipal securities that pay interest that is exempt from federal income tax in order to meet the requirements necessary to pay out exempt-interest dividends to its shareholders, if the Fund fails to meet this requirement, the income distributions resulting from all of its investments, including its municipal securities, may be subject to federal income tax when received by shareholders.


Investing in the Fund involves risk, and there is no guarantee that the Fund will achieve its investment goal. You could lose money on your investment in the Fund, just as you could with other investments. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money on your investment in the Fund, just as you could with other investments.
RIsk Not Insured [Text] rr_RiskNotInsured An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The bar chart and the performance table below provide some indication of the risks of investing in the Class Y Shares of the Fund by showing changes in the Fund's performance from year to year for the past nine 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.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and the performance table below provide some indication of the risks of investing in the Class Y Shares of the Fund by showing changes in the Fund's performance from year to year for the past nine 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.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex This table compares the Fund's average annual total returns to those of a broad-based index and the Fund's 60/40 Blended Benchmark, which consists of the Bloomberg Barclays High Yield Municipal Bond Index (60%) and the Bloomberg Barclays Municipal Bond Index (40%). The Fund's 60/40 Blended Benchmark is designed to reflect a useful comparison to the Fund's overall performance and reflects the Fund's investment strategy more accurately than the broad-based index.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-DIAL-SEI
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

  Best Quarter: 17.31% (06/30/09)
Worst Quarter: -4.55% (12/31/16)
The Fund's Class Y total return (pre-tax) from January 1, 2019 to September 30, 2019 was 9.45%.		  
Year to Date Return, Label rr_YearToDateReturnLabel Class Y total return (pre-tax)
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2019
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 9.45%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 17.31%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2016
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (4.55%)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate 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.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred 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.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher In some cases, the Fund's return after taxes may exceed the Fund's return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock

The Fund's Class Y Shares commenced operations on May 1, 2015. For full calendar years through December 31, 2015, the performance of the Fund's Class F Shares is shown. The Fund's Class F Shares are offered in a separate prospectus. Because Class Y Shares are invested in the same portfolio of securities, returns for Class Y Shares would have been substantially similar to those of Class F Shares, shown here, and would have differed only to the extent that Class Y Shares have lower total annual fund operating expenses than Class F Shares.


This table compares the Fund's average annual total returns to those of a broad-based index and the Fund's 60/40 Blended Benchmark, which consists of the Bloomberg Barclays High Yield Municipal Bond Index (60%) and the Bloomberg Barclays Municipal Bond Index (40%). The Fund's 60/40 Blended Benchmark is designed to reflect a useful comparison to the Fund's overall performance and reflects the Fund's investment strategy more accurately than the broad-based index.


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. In some cases, the Fund's return after taxes may exceed the Fund's return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period.
Average Annual Return, Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (for the periods ended December 31, 2018)
Class Y Prospectus | STET TAX-ADVANTAGED INCOME FUND | Bloomberg Barclays High Yield Municipal Bond Index Return (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Bloomberg Barclays High Yield Municipal Bond Index Return (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 4.76%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 6.53%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 9.12%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 4.87%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Sep. 04, 2007
Class Y Prospectus | STET TAX-ADVANTAGED INCOME FUND | The Fund's 60/40 Blended Benchmark Return (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel The Fund's 60/40 Blended Benchmark Return (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 3.36%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.45%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.41%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 4.68%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Sep. 04, 2007
Class Y Prospectus | STET TAX-ADVANTAGED INCOME FUND | STET TAX-ADVANTAGED INCOME FUND - CLASS Y  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.50%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.33%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.83%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 85
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 265
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 460
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,025
Annual Return 2009 rr_AnnualReturn2009 34.13%
Annual Return 2010 rr_AnnualReturn2010 5.25%
Annual Return 2011 rr_AnnualReturn2011 5.70%
Annual Return 2012 rr_AnnualReturn2012 15.97%
Annual Return 2013 rr_AnnualReturn2013 (3.46%)
Annual Return 2014 rr_AnnualReturn2014 11.24%
Annual Return 2015 rr_AnnualReturn2015 5.50%
Annual Return 2016 rr_AnnualReturn2016 2.05%
Annual Return 2017 rr_AnnualReturn2017 8.79%
Annual Return 2018 rr_AnnualReturn2018 0.77%
Label rr_AverageAnnualReturnLabel Return Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 0.77% [1]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.59% [1]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 8.17% [1]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 4.73% [1]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Sep. 04, 2007 [1]
Class Y Prospectus | STET TAX-ADVANTAGED INCOME FUND | STET TAX-ADVANTAGED INCOME FUND - CLASS Y | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (0.10%) [1]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.30% [1]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.66% [1]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 4.18% [1]
Class Y Prospectus | STET TAX-ADVANTAGED INCOME FUND | STET TAX-ADVANTAGED INCOME FUND - CLASS Y | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.58% [1]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.10% [1]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.15% [1]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 4.16% [1]
[1] The Fund's Class Y Shares commenced operations on May 1, 2015. For periods prior to May 1, 2015, the performance of the Fund's Class F Shares has been used. Returns for Class Y Shares would have been substantially similar to those of Class F Shares and would have differed only to the extent that Class Y Shares have lower total annual fund operating expenses than Class F Shares.