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(Morgan Stanley Tax-Free Daily Income Trust - Classes R and S) | (Morgan Stanley Tax-Free Daily Income Trust)  
Prospectus: rr_ProspectusTable  
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
Morgan Stanley Tax-Free Daily Income Trust (the “Fund”) is a money market fund that seeks to provide as high a level of daily income exempt from federal income tax as is consistent with stability of principal and liquidity.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The table below describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay fees other than the fees and expenses of the Fund, such as brokerage commissions and other fees charged by financial intermediaries, which are not reflected in the tables and examples below.
The Fund is a no-load fund. The Fund does not impose any sales charges and does not charge account or exchange fees. The Fund offers two classes of shares: the R Class and the S Class. Each class has the same fees and expenses.
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)
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
The example below 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, your investment has a 5% return each year and the Fund’s operating expenses remain the same (except that the example incorporates the fee waiver and/or expense reimbursement arrangement for only the first year). 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 Fund will invest in high quality, short-term securities that are normally municipal obligations that pay interest exempt from federal income taxes. The Adviser seeks to maintain the Fund’s share price at $1.00. The share price remaining stable at $1.00 means that the Fund would preserve the principal value of your investment.
Municipal obligations are securities issued by state and local governments and their agencies. These securities typically are “general obligation” or “revenue” bonds, notes or commercial paper. The Fund may invest up to 20% of its net assets in taxable money market securities or in securities that pay interest income subject to the federal “alternative minimum tax,” and some taxpayers may have to pay tax on a Fund distribution of this income. In addition, the Fund may temporarily invest more than 20% of its assets in taxable money market securities and in securities that pay interest income subject to the federal “alternative minimum tax” for defensive purposes in attempting to respond to adverse market conditions, including when suitable municipal obligations are unavailable. When the Fund makes such investments, a higher portion of the Fund’s distributions will likely be subject to federal income tax and/or the federal alternative minimum tax.
The Fund’s investments may include tender option bonds and custodial receipts. Tender option bonds are municipal obligations held pursuant to a custodial arrangement and issued pursuant to an agreement with a third-party such as a bank or financial institution to provide the holder with the option of tendering the bond at periodic intervals. The holder of the tender option bond effectively holds a demand obligation that bears interest at prevailing short-term rates. Custodial receipts represent interests in future
interest and/or principal payments  on U.S. government securities or municipal obligations. Additionally, the Fund may invest in investment companies, including money market funds, and may invest some or all of its short-term cash investments in any money market fund advised or managed by the Adviser or its affiliates.
The Fund may purchase debt obligations that have fixed, variable or floating rates of interest. The interest rates payable on variable rate or floating rate obligations may fluctuate based upon changes in market rates.
The Fund has a fundamental policy of investing at least 80% of its assets in securities the interest on which is exempt from federal income tax, and which are not subject to the federal “alternative minimum tax.” A fundamental policy may not be changed without shareholder approval.
The Fund operates as a “retail money market fund,” as such term is defined or interpreted under Rule 2a-7 under the Investment Company Act of 1940, as amended (the “1940 Act”). A “retail money market fund” is a money market fund that has policies and procedures reasonably designed to limit all beneficial owners of the fund to natural persons. As a “retail money market fund,” the Fund may value its securities using the amortized cost method as permitted by Rule 2a-7 to seek to maintain a stable net asset value per share (“NAV”) of $1.00. Like other retail money market funds, the Fund is subject to the possible imposition of liquidity fees and/or redemption gates.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Past Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s R Class shares performance from year-to-year and by showing the Fund’s average annual returns for the past one, five and 10 year periods and since inception. The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future. Updated performance information is available online at www.morganstanley.com/im or by calling toll-free (800) 869-6397.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund’s R Class shares performance from year-to-year and by showing the Fund’s average annual returns for the past one, five and 10 year periods and since inception.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone (800) 869-6397
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.morganstanley.com/im
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 [Heading] rr_BarChartHeading Annual Total Returns—Calendar Years
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
High Quarter
12/31/22
0.56%
Low Quarter
03/31/13
0.00%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns  (for the calendar periods ended December 31, 2022)
Money Market Seven Day Yield, Caption [Text] rr_MoneyMarketSevenDayYieldCaption For the Fund’s most recent 7-day annualized yield, you may call toll-free (800) 869-6397.
Money Market Seven Day Yield Phone rr_MoneyMarketSevenDayYieldPhone (800) 869-6397
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
For the Fund’s most recent 7-day annualized yield, you may call toll-free (800) 869-6397.
(Morgan Stanley Tax-Free Daily Income Trust - Classes R and S) | (Morgan Stanley Tax-Free Daily Income Trust) | Credit and Interest Rate Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Credit and Interest Rate Risk. Credit risk refers to the possibility that the issuer or guarantor of a security will be unable or unwilling or perceived to be unable or unwilling to make interest payments and/or repay the principal on its debt. In the case of revenue bonds, notes or commercial paper, for example, the credit risk is the possibility that the user fees from a project or other specified revenue sources are insufficient to meet interest and/or principal payment obligations. In such instances,  the value of the Fund could decline and the Fund could lose money. Interest rate risk refers to the decline in the value of a fixed-income security resulting from changes in the general level of interest rates. When the general level of interest rates goes up, the prices of most fixed-income securities go down. When the general level of interest rates goes down, the prices of most fixed-income securities go up. The Fund may invest in variable and floating rate securities. Although these instruments are generally less sensitive to interest rate changes than fixed rate instruments, the value of variable and floating rate securities may decline if their interest rates do not rise as quickly, or as much, as general interest rates. The Fund may face a heightened level of interest rate risk in times of monetary policy change and/or uncertainty, such as when the Federal Reserve Board adjusts a quantitative easing program and/or changes rates. A changing interest rate environment increases certain risks, including the potential for periods of volatility, increased redemptions, shortened durations (i.e., prepayment risk) and extended durations (i.e., extension risk). For example, during periods when interest rates are low, the Fund’s yield (and total return) also may be low or otherwise adversely affected or the Fund may be unable to maintain positive returns or a stable NAV of $1.00 per share.  Credit ratings may not be an accurate assessment of liquidity or credit risk. Although credit ratings may not accurately reflect the true credit risk of an instrument, a change in the credit rating of an instrument or an issuer can have a rapid, adverse effect on the instrument’s liquidity and make it more difficult for the Fund to sell at an advantageous price or time.
(Morgan Stanley Tax-Free Daily Income Trust - Classes R and S) | (Morgan Stanley Tax-Free Daily Income Trust) | Fixed-Income Securities [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
•
Fixed-Income Securities. Fixed-income securities are subject to the risk of the issuer’s inability to meet principal and interest payments on its obligations (i.e., credit risk) and are subject to price volatility resulting from, among other things, interest rate sensitivity (i.e., interest rate risk), market perception of the creditworthiness of the issuer and general market liquidity (i.e., market risk). The Fund may face a heightened level of interest rate risk in times of monetary policy change and/or uncertainty, such as when the Federal Reserve Board adjusts a quantitative easing program and/or changes rates.  The Fund may be subject to certain liquidity risks that may result from the lack of an active market and the reduced number and capacity of traditional market participants to make a market in fixed-income securities.
(Morgan Stanley Tax-Free Daily Income Trust - Classes R and S) | (Morgan Stanley Tax-Free Daily Income Trust) | Tax-Exempt Variable Rate Demand Notes [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Tax-Exempt Variable Rate Demand Notes. Tax-exempt variable rate demand notes are variable rate tax-exempt debt obligations that give investors the right to demand principal repayment. Due to cyclical supply and demand considerations, at times the yields on these obligations can exceed the yield on taxable money market obligations. The interest rate on these instruments may be reset daily, weekly or on some other reset period and may have a floor or ceiling on interest rate changes. The interest rate of a floating rate instrument may be based on a known lending rate, such as a bank’s prime rate, and is reset whenever such rate is adjusted. The interest rate on a variable rate demand note is reset at specified intervals at a market rate. The Fund’s ability to receive
payments of principal and interest and other amounts in connection with debt obligations held by it will depend primarily on the financial condition of the issuer. The failure by the Fund to receive scheduled interest or principal payments on a debt obligation would adversely affect the income of the Fund and would likely reduce the value of its assets, which would be reflected in a reduction in the Fund’s NAV.
(Morgan Stanley Tax-Free Daily Income Trust - Classes R and S) | (Morgan Stanley Tax-Free Daily Income Trust) | Municipal Obligations [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Municipal Obligations. To the extent the Fund invests in municipal obligations issued by state and local governments and their agencies, the Fund may be susceptible to political, economic, regulatory or other factors affecting issuers of these municipal obligations. To the extent that the Fund invests in municipal obligations of issuers in the same economic sector, it could be more sensitive to economic, business or political developments that affect such sector. During certain economic and other conditions, the financial resources of many issuers of municipal securities may be significantly stressed, which could impair any such issuer’s ability to meet its financial obligations when due and adversely impact the value of its securities held by the Fund. There may be times that, in the opinion of the Adviser, municipal money market securities of sufficient quality are not available for the Fund to be able to invest in accordance with its normal investment policies. As a temporary defensive position, the Adviser may invest any portion of the Fund’s assets in obligations subject to federal income tax, in securities that pay interest income subject to the federal “alternative minimum tax” or may hold any portion of the Fund’s assets in cash. Under such circumstances, a higher portion of the Fund’s distributions will likely be subject to federal income tax and/or the federal alternative minimum tax.
(Morgan Stanley Tax-Free Daily Income Trust - Classes R and S) | (Morgan Stanley Tax-Free Daily Income Trust) | Tender Option Bonds and Custodial Receipts [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Tender Option Bonds and Custodial Receipts. The risks of tender option bonds and custodial receipts include the risk that the owner of such instruments may not be considered the owner for federal income tax purposes and thus will not be entitled to treat such interest as exempt from federal income tax. Additionally, the occurrence of certain defaults or a credit rating downgrade on the underlying security may impair the ability to tender the bond or receipt back to the third-party provider of the demand option, thus causing the bond or receipt to become illiquid.
(Morgan Stanley Tax-Free Daily Income Trust - Classes R and S) | (Morgan Stanley Tax-Free Daily Income Trust) | Investment Companies [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Investment Companies.  The Fund’s investment in an investment company is subject to the underlying risks of that investment company’s portfolio securities. In addition to the Fund’s fees and expenses, the Fund generally would bear its share of the investment company’s fees and expenses.
(Morgan Stanley Tax-Free Daily Income Trust - Classes R and S) | (Morgan Stanley Tax-Free Daily Income Trust) | Market and Geopolitical Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Market and Geopolitical Risk. The value of your investment in the Fund is based on the values of the Fund’s investments, which may change due to economic and other events that affect markets generally, as well as those that affect particular regions, countries, industries, companies or governments. These events may be sudden and unexpected, and could adversely affect the liquidity of the Fund’s investments, which may in turn impact valuation, the Fund’s ability to sell securities and/or its ability to meet redemptions. The risks associated with these developments may be magnified if certain social, political, economic and other conditions and events (such as war, natural disasters, epidemics and pandemics, terrorism, conflicts, social unrest, recessions, inflation, rapid interest rate changes and supply chain disruptions) adversely interrupt the global economy and financial markets. It is difficult to predict when events affecting the U.S. or global financial markets may occur, the effects that such events may have and the duration of those effects (which may last for extended periods). These events may negatively impact broad segments of businesses and populations and have a significant and rapid negative impact on the performance of the Fund’s investments, adversely affect the Fund’s ability to maintain a stable $1.00 share price and exacerbate pre-existing risks to the Fund.
(Morgan Stanley Tax-Free Daily Income Trust - Classes R and S) | (Morgan Stanley Tax-Free Daily Income Trust) | Large Shareholder Transactions Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Large Shareholder Transactions Risk. The Fund may experience adverse effects when shareholders purchase or redeem large amounts of shares of the Fund, which may occur rapidly or unexpectedly. Such larger than normal shareholder redemptions may negatively impact the Fund’s NAV and liquidity.
(Morgan Stanley Tax-Free Daily Income Trust - Classes R and S) | (Morgan Stanley Tax-Free Daily Income Trust) | Liquidity [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Liquidity. The Fund may make investments that are illiquid or that may become illiquid or less liquid in response to overall economic conditions or adverse investor perceptions, and which may entail greater risk than investments in other types of securities. The liquidity of portfolio securities can deteriorate rapidly due to credit events affecting issuers or guarantors, such as a credit rating downgrade, or due to general market conditions or a lack of willing buyers. An inability to sell one or more portfolio positions, or selling such positions at an unfavorable time and/or under unfavorable conditions, can adversely affect the Fund’s ability to maintain a stable $1.00 share price.
(Morgan Stanley Tax-Free Daily Income Trust - Classes R and S) | (Morgan Stanley Tax-Free Daily Income Trust) | Stable NAV Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Stable NAV Risk. The Fund may not be able to maintain a stable $1.00 share price at all times. If the Fund or another money market fund fails to maintain a stable NAV or maintain certain weekly liquid asset levels (or if there is a perceived threat of the inability to maintain a stable NAV or a particular weekly liquid asset level), the Fund could be subject to increased redemptions, which may adversely impact the Fund’s ability to maintain a stable $1.00 share price.
(Morgan Stanley Tax-Free Daily Income Trust - Classes R and S) | (Morgan Stanley Tax-Free Daily Income Trust) | Money Market Fund Regulation [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
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Money Market Fund Regulation. The SEC and other government agencies continue to review the regulation of money market funds. As of the date of this Prospectus, the SEC has proposed changes to the rules that govern money market funds. Legislative developments may also affect money market funds. These changes and developments, if implemented, may affect the investment strategies, performance, yield, operating expenses and continued viability of the Fund.
(Morgan Stanley Tax-Free Daily Income Trust - Classes R and S) | (Morgan Stanley Tax-Free Daily Income Trust) | Class R  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.15%
Component1 Other Expenses rr_Component1OtherExpensesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 1.01%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.26% [1]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.66% [1]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.60% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 61
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 334
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 628
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,464
Annual Return 2013 rr_AnnualReturn2013 0.01%
Annual Return 2014 rr_AnnualReturn2014 0.01%
Annual Return 2015 rr_AnnualReturn2015 0.01%
Annual Return 2016 rr_AnnualReturn2016 0.05%
Annual Return 2017 rr_AnnualReturn2017 0.27%
Annual Return 2018 rr_AnnualReturn2018 0.94%
Annual Return 2019 rr_AnnualReturn2019 1.29%
Annual Return 2020 rr_AnnualReturn2020 0.38%
Annual Return 2021 rr_AnnualReturn2021 0.01%
Annual Return 2022 rr_AnnualReturn2022 0.97%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel High Quarter
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 0.56%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2022
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Low Quarter
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn none
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2013
1 Year rr_AverageAnnualReturnYear01 0.97%
5 Years rr_AverageAnnualReturnYear05 0.72%
10 Years rr_AverageAnnualReturnYear10 0.39%
Since Inception rr_AverageAnnualReturnSinceInception 2.36% [2]
(Morgan Stanley Tax-Free Daily Income Trust - Classes R and S) | (Morgan Stanley Tax-Free Daily Income Trust) | Class S  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.15%
Component1 Other Expenses rr_Component1OtherExpensesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 1.01%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.26% [1]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.66% [1]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.60% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 61
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 334
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 628
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,464
1 Year rr_AverageAnnualReturnYear01 0.97%
5 Years rr_AverageAnnualReturnYear05 0.72%
10 Years rr_AverageAnnualReturnYear10
Since Inception rr_AverageAnnualReturnSinceInception 0.60% [2]
[1]
1 The Fund’s “Adviser” and “Administrator,” Morgan Stanley Investment Management Inc., has agreed to assume all operating expenses of the Fund and to waive the advisory fee and administration fee, as applicable, to the extent such expenses and fees, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), on an annualized basis exceeds 0.60% of the average daily net assets of the Fund, which includes a waiver in which the Fund’s “Distributor,” Morgan Stanley Distribution, Inc., has agreed to waive all of the Fund’s shareholder servicing fee that it may receive. These fee waivers and/or expense reimbursements will continue for at least one year from the date of this Prospectus or until such time as the Fund’s Board of Trustees acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.
[2]
* R Class commenced operations on February 20, 1981, and S Class commenced operations on June 28, 2016.