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SDIT GOVERNMENT FUND | GOVERNMENT FUND - Admin Class Shares Prospectus  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk/Return [Heading] oef_RiskReturnHeading GOVERNMENT FUND
Objective [Heading] oef_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] oef_ObjectivePrimaryTextBlock

Preserve principal value and maintain a high degree of liquidity while providing current income.
Expense Heading [Optional Text] oef_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] oef_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 [Optional Text] oef_OperatingExpensesCaption ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Expense Example [Heading] oef_ExpenseExampleHeading EXAMPLE
Expense Example Narrative [Text Block] oef_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] oef_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] oef_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] oef_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.
Bar Chart and Performance Table [Heading] oef_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] oef_PerformanceNarrativeTextBlock

The bar chart and the performance table below provide some indication of the risks of investing in the Admin Class 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] oef_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and the performance table below provide some indication of the risks of investing in the Admin Class 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] oef_PerformanceAvailabilityPhone 1-800-DIAL-SEI
Performance Availability Website Address [Text] oef_PerformanceAvailabilityWebSiteAddress http://www.seic.com/holdings
Performance Past Does Not Indicate Future [Text] oef_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] oef_BarChartClosingTextBlock
Best Quarter: 1.25% (12/31/23)
Worst Quarter: 0.00% (03/31/21)
The Fund's Admin Class total return from January 1, 2026 to March 31, 2026 was 0.82%.
Year to Date Return, Label [Optional Text] oef_YearToDateReturnLabel The Fund's Admin Class total return from January 1, 2026 to March 31, 2026 was
Bar Chart, Year to Date Return, Date oef_BarChartYearToDateReturnDate Mar. 31, 2026
Bar Chart, Year to Date Return oef_BarChartYearToDateReturn 0.82%
Highest Quarterly Return, Label [Optional Text] oef_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date oef_BarChartHighestQuarterlyReturnDate Dec. 31, 2023
Highest Quarterly Return oef_BarChartHighestQuarterlyReturn 1.25%
Lowest Quarterly Return, Label [Optional Text] oef_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date oef_BarChartLowestQuarterlyReturnDate Mar. 31, 2021
Lowest Quarterly Return oef_BarChartLowestQuarterlyReturn none
Performance Table Heading oef_PerformanceTableHeading Average Annual Total Returns (for the periods ended December 31, 2025)
Performance Table Closing [Text Block] oef_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.
SDIT GOVERNMENT FUND | GOVERNMENT FUND - Admin Class Shares Prospectus | Risk Not Insured [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock 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.
SDIT GOVERNMENT FUND | GOVERNMENT FUND - Admin Class Shares Prospectus | Market Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

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.
SDIT GOVERNMENT FUND | GOVERNMENT FUND - Admin Class Shares Prospectus | U.S. Government Securities Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

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.
SDIT GOVERNMENT FUND | GOVERNMENT FUND - Admin Class Shares Prospectus | Credit Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

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.
SDIT GOVERNMENT FUND | GOVERNMENT FUND - Admin Class Shares Prospectus | Interest Rate Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

Interest Rate Risk — The risk that the Fund's yield will decline due to changing interest rates. A rise in interest rates typically causes a fall in the value of fixed income securities in which the Fund invests, whereas a fall in interest rates typically results in the Fund having to invest available cash in instruments with lower interest rates than those of the current portfolio securities. During periods when interest rates are low, the Fund's yield will also be low and the Fund may not generate enough income to pay its expenses or pay a daily dividend. 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 have unpredictable effects on the markets and may affect the liquidity of the fixed-income securities held by the Fund.
SDIT GOVERNMENT FUND | GOVERNMENT FUND - Admin Class Shares Prospectus | Cash Management Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

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.
SDIT GOVERNMENT FUND | GOVERNMENT FUND - Admin Class Shares Prospectus | Repurchase Agreement Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

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.
SDIT GOVERNMENT FUND | GOVERNMENT FUND - Admin Class Shares Prospectus | Redemption Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

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.
SDIT GOVERNMENT FUND | GOVERNMENT FUND - Admin Class Shares Prospectus | Liquidity Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

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.
SDIT GOVERNMENT FUND | GOVERNMENT FUND - Admin Class Shares Prospectus | Extension Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

Extension Risk — The risk that rising interest rates may extend the duration of a fixed income security, typically reducing the security's value.
SDIT GOVERNMENT FUND | GOVERNMENT FUND - Admin Class Shares Prospectus | Opportunity Risk [Member]  
Prospectus [Line Items] oef_ProspectusLineItems  
Risk [Text Block] oef_RiskTextBlock

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.
SDIT GOVERNMENT FUND | GOVERNMENT FUND - Admin Class Shares Prospectus | Admin Class Shares (formerly Class CAA Shares)  
Prospectus [Line Items] oef_ProspectusLineItems  
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.07%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.00%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.38%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.45%
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 46
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 144
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 252
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 $ 567
GOVERNMENT FUND - Admin Class Shares Prospectus | Admin Class Shares (formerly Class CAA Shares)  
Prospectus [Line Items] oef_ProspectusLineItems  
Annual Return [Percent] oef_AnnlRtrPct 0.17%
Annual Return [Percent] oef_AnnlRtrPct 0.68%
Annual Return [Percent] oef_AnnlRtrPct 1.61%
Annual Return [Percent] oef_AnnlRtrPct 2.02%
Annual Return [Percent] oef_AnnlRtrPct 0.35%
Annual Return [Percent] oef_AnnlRtrPct 0.01%
Annual Return [Percent] oef_AnnlRtrPct 1.36%
Annual Return [Percent] oef_AnnlRtrPct 4.72%
Annual Return [Percent] oef_AnnlRtrPct 4.88%
Annual Return [Percent] oef_AnnlRtrPct 3.99%
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Government Fund
Average Annual Return, Percent oef_AvgAnnlRtrPct 3.99% [1]
Average Annual Return, Percent oef_AvgAnnlRtrPct 2.97% [1]
Average Annual Return, Percent oef_AvgAnnlRtrPct 1.96% [1]
Average Annual Return, Percent oef_AvgAnnlRtrPct 2.38% [1]
Performance Inception Date oef_PerfInceptionDate Oct. 27, 1995
[1] The Fund's Admin Class shares commenced operations on November 20, 2015. For periods prior to November 20, 2015, the performance of the Fund's Institutional shares has been used. Returns for Admin Class shares would have been substantially similar to those of Institutional shares and would have differed only to the extent that Admin Class shares, for certain years, have higher total annual fund operating expenses than Institutional shares.