Fees and Expenses |
Sep. 30, 2025
USD ($)
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| MSIFT Discovery Portfolio - Classes I, A, L, C and R6 | Discovery Portfolio | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Heading [Optional Text] | Fees and Expenses | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Narrative [Text Block] | 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. For purchases of Class A shares, you may qualify for a sales charge discount if the cumulative net asset value per share (“NAV”) of Class A shares of the Fund being purchased in a single transaction, together with the NAV of any shares of the Fund and/or certain other Morgan Stanley Funds already held in Related Accounts (as defined in the section of the Prospectus entitled “Shareholder Information—Exchange Privilege”) as of the date of the transaction, amounts to $50,000 or more. More information about this combined purchase discount and other discounts is available from your authorized financial intermediary, on page 24 of the Prospectus in the section entitled “Shareholder Information—Sales Charges Applicable to Purchases of Class A Shares” and in Appendix A attached to the Prospectus. Class I shares may be available on brokerage platforms of firms that have agreements with the Fund’s principal underwriter permitting such firms to (i) offer Class I shares solely when acting as an agent for the investor and (ii) impose on an investor transacting in Class I shares through such platforms a commission and/or other forms of compensation to the broker. Shares of the Fund are available in other share classes that have different fees and expenses.
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| Expense Breakpoint Discounts [Text] | For purchases of Class A shares, you may qualify for a sales charge discount if the cumulative net asset value per share (“NAV”) of Class A shares of the Fund being purchased in a single transaction, together with the NAV of any shares of the Fund and/or certain other Morgan Stanley Funds already held in Related Accounts (as defined in the section of the Prospectus entitled “Shareholder Information—Exchange Privilege”) as of the date of the transaction, amounts to $50,000 or more. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Breakpoint, Minimum Investment Required [Amount] | $ 50,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Fees Caption [Optional Text] | Shareholder Fees (fees paid directly from your investment) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Fees [Table] |
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[1],[2] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Operating Expenses Caption [Optional Text] | Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual Fund Operating Expenses [Table] |
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[3],[4] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Deferred Charges [Text Block] | Investments in Class A shares that are not subject to any sales charges at the time of purchase are subject to a contingent deferred sales charge (“CDSC”) of 1.00% that will be imposed if you sell your shares within 12 months after purchase, except for certain specific circumstances. See “Shareholder Information—How To Redeem Fund Shares” for further information about the CDSC waiver categories.The Class C CDSC is only applicable if you sell your shares within one year after the last day of the month of purchase. See “Shareholder Information—How To Redeem Fund Shares” for a complete discussion of the CDSC. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Example [Heading] | Example | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Example Narrative [Text Block] | 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 that the Fund’s operating expenses remain the same. After eight years, Class C shares of the Fund generally will convert automatically to Class A shares of the Fund. The example for Class C shares reflects the conversion to Class A shares after eight years. Please refer to the section of the Prospectus entitled “Shareholder Information—Conversion Features” for more information. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
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| Expense Example by, Year, Caption [Text] | If You SOLD Your Shares | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Example, With Redemption [Table] |
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| Expense Example, No Redemption, By Year, Caption [Text] | If You HELD Your Shares | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Example, No Redemption [Table] |
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| Portfolio Turnover [Heading] | Portfolio Turnover | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Portfolio Turnover [Text Block] | 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 Total 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.
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| Portfolio Turnover, Rate | 88.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| MSIFT Corporate Bond Portfolio - Classes I, A, L, and C | Corporate Bond Portfolio | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Heading [Optional Text] | Fees and Expenses | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Narrative [Text Block] | 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. For purchases of Class A shares, you may qualify for a sales charge discount if the cumulative net asset value per share (“NAV”) of Class A shares of the Fund being purchased in a single transaction, together with the NAV of any shares of the Fund and/or certain other Morgan Stanley Funds already held in Related Accounts (as defined in the section of the Prospectus entitled “Shareholder Information—Exchange Privilege”) as of the date of the transaction, amounts to $100,000 or more. More information about this combined purchase discount and other discounts is available from your authorized financial intermediary, on page 41 of the Prospectus in the section entitled “Shareholder Information—Sales Charges Applicable to Purchases of Class A Shares” and in Appendix A attached to the Prospectus. Class I shares may be available on brokerage platforms of firms that have agreements with the Fund’s principal underwriter permitting such firms to (i) offer Class I shares solely when acting as an agent for the investor and (ii) impose on an investor transacting in Class I shares through such platforms a commission and/or other forms of compensation to the broker. Shares of the Fund are available in other share classes that have different fees and expenses.
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| Expense Breakpoint Discounts [Text] | For purchases of Class A shares, you may qualify for a sales charge discount if the cumulative net asset value per share (“NAV”) of Class A shares of the Fund being purchased in a single transaction, together with the NAV of any shares of the Fund and/or certain other Morgan Stanley Funds already held in Related Accounts (as defined in the section of the Prospectus entitled “Shareholder Information—Exchange Privilege”) as of the date of the transaction, amounts to $100,000 or more. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Breakpoint, Minimum Investment Required [Amount] | $ 100,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Fees Caption [Optional Text] | Shareholder Fees (fees paid directly from your investment) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Fees [Table] |
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[5],[6] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Operating Expenses Caption [Optional Text] | Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual Fund Operating Expenses [Table] |
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[7],[8] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Deferred Charges [Text Block] | Investments in Class A shares that are not subject to any sales charges at the time of purchase are subject to a contingent deferred sales charge (“CDSC”) of 0.75% that will be imposed if you sell your shares within 12 months except for certain specific circumstances. See “Shareholder Information—How To Redeem Fund Shares” for further information about the CDSC waiver categories.The Class C CDSC is only applicable if you sell your shares within one year after the last day of the month of purchase. See “Shareholder Information—How To Redeem Fund Shares” for a complete discussion of the CDSC. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Example [Heading] | Example | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Example Narrative [Text Block] | 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 that 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). After eight years, Class C shares of the Fund generally will convert automatically to Class A shares of the Fund. The example for Class C shares reflects the conversion to Class A shares after eight years. Please refer to the section of the Prospectus entitled “Shareholder Information—Conversion Features” for more information. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
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| Expense Example by, Year, Caption [Text] | If You SOLD Your Shares | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Example, With Redemption [Table] |
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| Expense Example, No Redemption, By Year, Caption [Text] | If You HELD Your Shares | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Example, No Redemption [Table] |
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| Portfolio Turnover [Heading] | Portfolio Turnover | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Portfolio Turnover [Text Block] | 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 Total 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 117% of the average value of its portfolio.
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| Portfolio Turnover, Rate | 117.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| MSIFT Ultra-Short Portfolios - Classes IR, Institutional Class, Class A | Ultra-Short Income Portfolio | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Heading [Optional Text] | Fees and Expenses | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Narrative [Text Block] | 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 does not charge any sales loads or other fees when you purchase or redeem shares.
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| Operating Expenses Caption [Optional Text] | Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual Fund Operating Expenses [Table] |
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[9],[10] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Example [Heading] | Example | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Example Narrative [Text Block] | 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 that 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:
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| Expense Example by, Year, Caption [Text] | If You SOLD Your Shares | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Example, With Redemption [Table] |
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| Expense Example, No Redemption, By Year, Caption [Text] | If You HELD Your Shares | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Example, No Redemption [Table] |
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| Portfolio Turnover [Heading] | Portfolio Turnover | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Portfolio Turnover [Text Block] | 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 Total Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the reporting period, the Fund did not hold any long-term investments and accordingly portfolio turnover is not applicable.
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| MSIFT Global Strategist Portfolio - Classes I, A, L, C and R6 | Global Strategist Portfolio | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Heading [Optional Text] | Fees and Expenses | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Narrative [Text Block] | 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. For purchases of Class A shares, you may qualify for a sales charge discount if the cumulative net asset value per share (“NAV”) of Class A shares of the Fund being purchased in a single transaction, together with the NAV of any shares of the Fund and/or certain other Morgan Stanley Funds already held in Related Accounts (as defined in the section of the Prospectus entitled “Shareholder Information—Exchange Privilege”) as of the date of the transaction, amounts to $50,000 or more. More information about this combined purchase discount and other discounts is available from your authorized financial intermediary, on page 32 of the Prospectus in the section entitled “Shareholder Information—Sales Charges Applicable to Purchases of Class A Shares” and in Appendix A attached to the Prospectus. Class I shares may be available on brokerage platforms of firms that have agreements with the Fund’s principal underwriter permitting such firms to (i) offer Class I shares solely when acting as an agent for the investor and (ii) impose on an investor transacting in Class I shares through such platforms a commission and/or other forms of compensation to the broker. Shares of the Fund are available in other share classes that have different fees and expenses.
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| Expense Breakpoint Discounts [Text] | For purchases of Class A shares, you may qualify for a sales charge discount if the cumulative net asset value per share (“NAV”) of Class A shares of the Fund being purchased in a single transaction, together with the NAV of any shares of the Fund and/or certain other Morgan Stanley Funds already held in Related Accounts (as defined in the section of the Prospectus entitled “Shareholder Information—Exchange Privilege”) as of the date of the transaction, amounts to $50,000 or more. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Breakpoint, Minimum Investment Required [Amount] | $ 50,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Fees Caption [Optional Text] | Shareholder Fees (fees paid directly from your investment) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Shareholder Fees [Table] |
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[11],[12] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Operating Expenses Caption [Optional Text] | Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Annual Fund Operating Expenses [Table] |
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[13],[14],[15] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expenses Deferred Charges [Text Block] | Investments in Class A shares that are not subject to any sales charges at the time of purchase are subject to a contingent deferred sales charge (“CDSC”) of 1.00% that will be imposed if you sell your shares within 12 months after purchase, except for certain specific circumstances. See “Shareholder Information—How To Redeem Fund Shares” for further information about the CDSC waiver categories.The Class C CDSC is only applicable if you sell your shares within one year after the last day of the month of purchase. See “Shareholder Information—How To Redeem Fund Shares” for a complete discussion of the CDSC. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Example [Heading] | Example | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Example Narrative [Text Block] | 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 that 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). After eight years, Class C shares of the Fund generally will convert automatically to Class A shares of the Fund. The example for Class C shares reflects the conversion to Class A shares after eight years. Please refer to the section of the Prospectus entitled “Shareholder Information—Conversion Features” for more information. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
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| Expense Example by, Year, Caption [Text] | If You SOLD Your Shares | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Example, With Redemption [Table] |
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| Expense Example, No Redemption, By Year, Caption [Text] | If You HELD Your Shares | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Expense Example, No Redemption [Table] |
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| Portfolio Turnover [Heading] | Portfolio Turnover | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Portfolio Turnover [Text Block] | 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 Total 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 92% of the average value of its portfolio.
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| Portfolio Turnover, Rate | 92.00% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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