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Class CAA Prospectus | SDIT GOVERNMENT FUND  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading GOVERNMENT FUND
Objective [Heading] rr_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

Preserve principal value and maintain a high degree of liquidity while providing current income.
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, hold, and sell Fund shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in this table and examples below.

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)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination May 31, 2022
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 or hold 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

Under normal market conditions, the Fund intends to invest at least 99.5% of its total assets in cash, government securities and/or repurchase agreements that are collateralized fully with cash or government securities. Government securities are obligations issued or guaranteed as to principal or interest by the U.S. government or its agencies or instrumentalities, including obligations issued by private issuers that are guaranteed as to principal or interest by the U.S. government or its agencies or instrumentalities.

Using a top-down strategy and bottom-up security selection, the sub-adviser (the Sub-Adviser) seeks to invest in securities with a remaining maturity not greater than 397 calendar days that are marketable, liquid and offer competitive yields, and which are expected to result in the Fund's portfolio having an average dollar-weighted maturity of 60 days or less and a dollar-weighted average life to maturity of 120 days or less. In making investment decisions, the Sub-Adviser also considers factors such as the anticipated level of interest rates and the maturity of individual securities relative to the maturity of the Fund as a whole. Currently, the Fund invests only in first-tier securities.

The Fund values its securities using amortized cost and seeks to maintain a stable net asset value (NAV) of $1.00 per share.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

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. Markets for fixed income securities may decline significantly in response to adverse issuer, political, regulatory, market, economic or other developments that may cause broad changes in market value, public perceptions concerning these developments, and adverse investor sentiment or publicity. Similarly, environmental and public health risks, such as natural disasters, epidemics, pandemics or widespread fear that such events may occur, may impact markets adversely and cause market volatility in both the short- and long-term. 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.

U.S. Government Securities Risk — Although U.S. Government securities are considered to be among the safest investments, they are still subject to the credit risk of the U.S. Government and 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. No assurance can be given that the U.S. Government will provide financial support to its agencies and instrumentalities if it is not obligated by law to do so.

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. Additionally, if the Fund has uninvested cash,

the Fund is subject to the risk that the depository institution holding the uninvested cash will be unable to repay the cash held.

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 the value of fixed income securities in which the Fund invests, while a fall in interest rates typically causes a rise in the value of such securities. During periods when interest rates are low, the Fund's yield will also be low. It is possible that the Fund will generate an insufficient amount of income to pay its expenses, and that it will not be able to pay a daily dividend and may have a negative yield (i.e., it may lose money on an operating basis). This could impair the Fund's ability to provide a positive yield and maintain a stable $1.00 share price. Fluctuations in interest rates may also affect the liquidity of the fixed-income securities held by the Fund. As a result, it is possible that the Fund would, during these conditions, maintain a substantial portion of its assets in cash, on which it may earn little, if any, income.

Cash Management Risk — The value of the investments held by the Fund for cash management purposes may be affected by market risks, changing interest rates and by changes in credit ratings of the investments. To the extent that the Fund has any uninvested cash, the Fund would be subject to credit risk with respect to the depository institution holding the cash. If the Fund holds uninvested cash, the Fund will not earn income on the cash. During such periods, it may be more difficult for the Fund to achieve its investment objective.

Repurchase Agreement Risk — Although repurchase agreement transactions must be fully collateralized at all times, they generally create leverage and involve some counterparty risk to the Fund whereby a defaulting counterparty could delay or prevent the Fund's recovery of collateral.

Redemption Risk — The Fund may experience periods of heavy redemptions that could cause the Fund to liquidate its assets at inopportune times or at a loss or depressed value, particularly during periods of declining or illiquid markets. This could have a significant adverse effect on the Fund's ability to maintain a stable $1.00 share price, and, in extreme circumstances, could cause the Fund to suspend redemptions and liquidate completely.

Liquidity Risk — The risk that certain securities may be difficult or impossible to sell at the time and the price that the seller would like. The seller 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.

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

Opportunity Risk — The risk of missing out on an investment opportunity because the assets necessary to take advantage of it are tied up in other investments.

LIBOR Replacement Risk — The U.K. Financial Conduct Authority has announced that it intends to stop compelling or inducing banks to submit certain London Inter-Bank Offered Rate (LIBOR) rates after 2021 and for the remaining LIBOR rates immediately after June 30, 2023. The elimination of LIBOR may adversely affect the interest rates on, and value of, certain Fund investments.

An investment in the Fund is not a bank deposit nor is it insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Although the Fund seeks to maintain a constant price per share of $1.00, you may lose money by investing in the Fund. The Fund's sponsor has

no legal obligation to provide financial support to the Fund, and you should not expect that the sponsor will provide financial support to the Fund at any time.

Investing in the Fund involves risk, and there is no guarantee that the Fund will achieve its investment goal.
Risk Money Market Fund May Not Preserve Dollar [Text] rr_RiskMoneyMarketFundMayNotPreserveDollar Although the Fund seeks to maintain a constant price per share of $1.00, you may lose money by investing in the Fund.
Risk Money Market Fund Sponsor May Not Provide Support [Text] rr_RiskMoneyMarketFundSponsorMayNotProvideSupport The Fund's sponsor has no legal obligation to provide financial support to the Fund, and you should not expect that the sponsor will provide financial support to the Fund at any time.
RIsk Not Insured [Text] rr_RiskNotInsured An investment in the Fund is not a bank deposit nor is it 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 CAA shares of the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception. The performance information shown is based on full calendar years. The Fund's past performance 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 CAA shares of the Fund by showing changes in the Fund's performance from year to year for the past ten calendar years and by showing the Fund's average annual returns for 1, 5 and 10 years, and since the Fund's inception.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-DIAL-SEI
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress http://www.seic.com/holdings
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund's past performance is not necessarily an indication of how the Fund will perform in the future.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Best Quarter: 0.54% (06/30/19)
Worst Quarter: 0.00% (12/31/20)
The Fund's Class CAA total return from January 1, 2021 to March 31, 2021 was 0.00%.




The Fund's Class CAA shares commenced operations on November 20, 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 CAA shares are invested in the same portfolio of securities, returns for Class CAA shares would have been substantially similar to those of Class F shares, shown here, and would have differed only to the extent that Class CAA shares, for certain years, have higher total annual fund operating expenses than Class F shares.
Year to Date Return, Label rr_YearToDateReturnLabel The Fund's Class CAA total return from January 1, 2021 to March 31, 2021 was
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn none
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2019
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 0.54%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn none
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for the periods ended December 31, 2020)
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

Please call 1-800-DIAL-SEI to obtain the Fund's current 7-day yield. Additional information about SEI's money market funds is available on our website at http://www.seic.com/holdings.
Money Market Seven Day Yield Phone rr_MoneyMarketSevenDayYieldPhone 1-800-DIAL-SEI
Class CAA Prospectus | SDIT GOVERNMENT FUND | Class CAA  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.07%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.38%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.45%
Fee Waivers and Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.20%)
Total Annual Fund Operating Expenses Less Fee Waivers and Expense Reimbursements rr_NetExpensesOverAssets 0.25% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 26
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 124
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 232
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 547
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 26
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 124
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 232
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 547
Annual Return 2011 rr_AnnualReturn2011 0.05%
Annual Return 2012 rr_AnnualReturn2012 0.02%
Annual Return 2013 rr_AnnualReturn2013 0.02%
Annual Return 2014 rr_AnnualReturn2014 0.02%
Annual Return 2015 rr_AnnualReturn2015 0.02%
Annual Return 2016 rr_AnnualReturn2016 0.17%
Annual Return 2017 rr_AnnualReturn2017 0.68%
Annual Return 2018 rr_AnnualReturn2018 1.61%
Annual Return 2019 rr_AnnualReturn2019 2.02%
Annual Return 2020 rr_AnnualReturn2020 0.35%
Label rr_AverageAnnualReturnLabel Government Fund
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 0.35% [2]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.96% [2]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 0.49% [2]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 2.25% [2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Oct. 27, 1995 [2]
[1] Effective May 31, 2021, the Fund's administrator and its affiliates have contractually agreed to waive fees and reimburse expenses for a period of one year in order to keep total annual Fund operating expenses (exclusive of interest from borrowings, brokerage commissions, trustees' fees, taxes and other extraordinary expenses not incurred in the ordinary course of the Fund's business) from exceeding 0.25%. This fee waiver and reimbursement agreement shall remain in effect until May 31, 2022 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 of the Fund (Board).
[2] The Fund's Class CAA shares commenced operations on November 20, 2015. For periods prior to November 20, 2015, the performance of the Fund's Class F shares has been used. Returns for Class CAA shares would have been substantially similar to those of Class F shares and would have differed only to the extent that Class CAA shares, for certain years, have higher total annual fund operating CAA class expenses than Class F shares.