Fees and Expenses

Dec. 31, 2025

USD ($)

(MSIF - Counterpoint Global Portfolios) | Advantage Portfolio

Fees and Expenses

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—Sales Charges Applicable to Purchases of Class A Shares”) 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 86 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.

Expense Breakpoint Discounts [Text]

Expense Breakpoint, Minimum Investment Required [Amount]

$ 50,000

Other Expenses, New Fund, Based on Estimates [Text]

“Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees [Table]


	Class I	Class A	Class L	Class C	Class R6
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	None	5.25%	None	None	None
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption)	None	1.00%¹	None	1.00%²	None

^[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]


	Class I	Class A	Class L	Class C	Class R6
Advisory Fee¹	0.65%	0.65%	0.65%	0.65%	0.65%
Distribution and/or Shareholder Service (12b-1) Fee	None	0.25%	0.75%²	1.00%	None
Other Expenses³	0.37%	0.38%	0.52%	0.38%	0.26%
Total Annual Fund Operating Expenses⁴	1.02%	1.28%	1.92%	2.03%	0.91%
Fee Waiver and/or Expense Reimbursement⁴	0.17%	0.08%	0.93%	0.08%	0.10%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement⁴	0.85%	1.20%	0.99%	1.95%	0.81%

^{[3],[4],[5],[6]}

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, 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 below 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). 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:

Expense Example by, Year, Caption [Text]

If You SOLD Your Shares

Expense Example, With Redemption [Table]


If You SOLD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$87	$308	$547	$1,232
Class A	$641	$902	$1,183	$1,982
Class L	$101	$513	$950	$2,168
Class C	$298	$629	$1,086	$2,159
Class R6	$83	$280	$494	$1,110

Expense Example, No Redemption, By Year, Caption [Text]

If You HELD Your Shares

Expense Example, No Redemption [Table]


If You HELD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$87	$308	$547	$1,232
Class A	$641	$902	$1,183	$1,982
Class L	$101	$513	$950	$2,168
Class C	$198	$629	$1,086	$2,159
Class R6	$83	$280	$494	$1,110

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 61% of the average value of its portfolio.

Portfolio Turnover, Rate

61.00%

(MSIF - Counterpoint Global Portfolios) | Global Endurance Portfolio

Prospectus [Line Items]

Expense Heading [Optional Text]

Fees and Expenses

Expense Narrative [Text Block]

Expense Breakpoint Discounts [Text]

Expense Breakpoint, Minimum Investment Required [Amount]

$ 50,000

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees [Table]


	Class I	Class A	Class C	Class R6
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	None	5.25%	None	None
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption)	None	1.00%¹	1.00%²	None

^[7],[8]

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]


	Class I	Class A	Class C	Class R6
Advisory Fee	0.80%	0.80%	0.80%	0.80%
Distribution and/or Shareholder Service (12b-1) Fee	None	0.25%	1.00%	None
Other Expenses	1.16%	1.33%	1.40%	7.98%
Total Annual Fund Operating Expenses¹	1.96%	2.38%	3.20%	8.78%
Fee Waiver and/or Expense Reimbursement¹	0.96%	1.03%	1.10%	7.83%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement¹	1.00%	1.35%	2.10%	0.95%

^[9]

Expenses Deferred Charges [Text Block]

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 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:

Expense Example by, Year, Caption [Text]

If You SOLD Your Shares

Expense Example, With Redemption [Table]


If You SOLD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$102	$522	$968	$2,208
Class A	$655	$1,135	$1,640	$3,024
Class C	$313	$884	$1,578	$3,238
Class R6	$97	$1,856	$3,484	$7,045

Expense Example, No Redemption, By Year, Caption [Text]

If You HELD Your Shares

Expense Example, No Redemption [Table]


If You HELD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$102	$522	$968	$2,208
Class A	$655	$1,135	$1,640	$3,024
Class C	$213	$884	$1,578	$3,238
Class R6	$97	$1,856	$3,484	$7,045

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

176.00%

(MSIF - Counterpoint Global Portfolios) | Global Insight Portfolio

Prospectus [Line Items]

Expense Heading [Optional Text]

Fees and Expenses

Expense Narrative [Text Block]

Expense Breakpoint Discounts [Text]

Expense Breakpoint, Minimum Investment Required [Amount]

$ 50,000

Other Expenses, New Fund, Based on Estimates [Text]

“Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees [Table]


	Class I	Class A	Class L	Class C	Class R6
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	None	5.25%	None	None	None
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption)	None	1.00%¹	None	1.00%²	None

^[10],[11]

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]


	Class I	Class A	Class L	Class C	Class R6
Advisory Fee¹	0.80%	0.80%	0.80%	0.80%	0.80%
Distribution and/or Shareholder Service (12b-1) Fee	None	0.25%	0.75%	1.00%	None
Other Expenses²	0.73%	0.74%	1.46%	0.79%	4.93%
Total Annual Fund Operating Expenses³	1.53%	1.79%	3.01%	2.59%	5.73%
Fee Waiver and/or Expense Reimbursement³	0.53%	0.47%	1.16%	0.49%	4.78%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement³	1.00%	1.32%	1.85%	2.10%	0.95%

^{[12],[13],[14]}

Expenses Deferred Charges [Text Block]

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.

Expense Example by, Year, Caption [Text]

If You SOLD Your Shares

Expense Example, With Redemption [Table]


If You SOLD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$102	$431	$784	$1,778
Class A	$652	$1,015	$1,402	$2,483
Class L	$188	$821	$1,480	$3,245
Class C	$313	$759	$1,332	$2,693
Class R6	$97	$1,281	$2,447	$5,290

Expense Example, No Redemption, By Year, Caption [Text]

If You HELD Your Shares

Expense Example, No Redemption [Table]


If You HELD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$102	$431	$784	$1,778
Class A	$652	$1,015	$1,402	$2,483
Class L	$188	$821	$1,480	$3,245
Class C	$213	$759	$1,332	$2,693
Class R6	$97	$1,281	$2,447	$5,290

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

66.00%

(MSIF - Counterpoint Global Portfolios) | Global Permanence Portfolio

Prospectus [Line Items]

Expense Heading [Optional Text]

Fees and Expenses

Expense Narrative [Text Block]

Expense Breakpoint Discounts [Text]

Expense Breakpoint, Minimum Investment Required [Amount]

$ 50,000

Other Expenses, New Fund, Based on Estimates [Text]

“Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees [Table]


	Class I	Class A	Class C	Class R6
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	None	5.25%	None	None
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption)	None	1.00%¹	1.00%²	None

^[15],[16]

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]


	Class I	Class A	Class C	Class R6
Advisory Fee¹	0.80%	0.80%	0.80%	0.80%
Distribution and/or Shareholder Service (12b-1) Fee	None	0.25%	1.00%	None
Other Expenses²	7.36%	7.93%	8.07%	15.62%
Total Annual Fund Operating Expenses³	8.16%	8.98%	9.87%	16.42%
Fee Waiver and/or Expense Reimbursement³	7.16%	7.63%	7.77%	15.47%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement³	1.00%	1.35%	2.10%	0.95%

^{[17],[18],[19]}

Expenses Deferred Charges [Text Block]

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.

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:

Expense Example by, Year, Caption [Text]

If You SOLD Your Shares

Expense Example, With Redemption [Table]


If You SOLD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$102	$1,746	$3,288	$6,736
Class A	$655	$2,350	$3,912	$7,304
Class C	$313	$2,147	$3,896	$7,466
Class R6	$97	$3,135	$5,519	$9,467

Expense Example, No Redemption, By Year, Caption [Text]

If You HELD Your Shares

Expense Example, No Redemption [Table]


If You HELD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$102	$1,746	$3,288	$6,736
Class A	$655	$2,350	$3,912	$7,304
Class C	$213	$2,147	$3,896	$7,466
Class R6	$97	$3,135	$5,519	$9,467

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

86.00%

(MSIF - Counterpoint Global Portfolios) | Growth Portfolio

Prospectus [Line Items]

Expense Heading [Optional Text]

Fees and Expenses

Expense Narrative [Text Block]

Expense Breakpoint Discounts [Text]

Expense Breakpoint, Minimum Investment Required [Amount]

$ 50,000

Other Expenses, New Fund, Based on Estimates [Text]

“Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees [Table]


	Class I	Class A	Class L	Class C	Class R6
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	None	5.25%	None	None	None
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption)	None	1.00%¹	None	1.00%²	None

^[20],[21]

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]


	Class I	Class A	Class L	Class C	Class R6
Advisory Fee¹	0.42%	0.42%	0.42%	0.42%	0.42%
Distribution and/or Shareholder Service (12b-1) Fee	None	0.25%	0.75%	1.00%	None
Other Expenses²	0.21%	0.22%	0.23%	0.22%	0.11%
Total Annual Fund Operating Expenses	0.63%	0.89%	1.40%	1.64%	0.53%

^[22],[23]

Expenses Deferred Charges [Text Block]

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 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:

Expense Example by, Year, Caption [Text]

If You SOLD Your Shares

Expense Example, With Redemption [Table]


If You SOLD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$64	$202	$351	$786


If You SOLD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class A	$611	$794	$992	$1,564
Class L	$143	$443	$766	$1,680
Class C	$267	$517	$892	$1,743
Class R6	$54	$170	$296	$665

Expense Example, No Redemption, By Year, Caption [Text]

If You HELD Your Shares

Expense Example, No Redemption [Table]


If You HELD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$64	$202	$351	$786
Class A	$611	$794	$992	$1,564
Class L	$143	$443	$766	$1,680
Class C	$167	$517	$892	$1,743
Class R6	$54	$170	$296	$665

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

53.00%

(MSIF - Counterpoint Global Portfolios) | Inception Portfolio

Prospectus [Line Items]

Expense Heading [Optional Text]

Fees and Expenses

Expense Narrative [Text Block]

Expense Breakpoint Discounts [Text]

Expense Breakpoint, Minimum Investment Required [Amount]

$ 50,000

Other Expenses, New Fund, Based on Estimates [Text]

“Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees [Table]


	Class I	Class A	Class L	Class C	Class R6
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	None	5.25%	None	None	None
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption)	None	1.00%¹	None	1.00%²	None
Redemption Fee (as a percentage of the amount redeemed on redemptions made within 30 days of purchase)	2.00%	2.00%	2.00%	2.00%	2.00%

^[24],[25]

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]


	Class I	Class A	Class L	Class C	Class R6
Advisory Fee¹	0.92%	0.92%	0.92%	0.92%	0.92%
Distribution and/or Shareholder Service (12b-1) Fee	None	0.25%	0.75%	1.00%	None
Other Expenses²	0.27%	0.33%	0.80%	0.37%	0.20%
Total Annual Fund Operating Expenses³	1.19%	1.50%	2.47%	2.29%	1.12%
Fee Waiver and/or Expense Reimbursement³	0.19%	0.15%	0.62%	0.19%	0.19%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement³	1.00%	1.35%	1.85%	2.10%	0.93%

^{[26],[27],[28]}

Expenses Deferred Charges [Text Block]

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.

Expense Example by, Year, Caption [Text]

If You SOLD Your Shares

Expense Example, With Redemption [Table]


If You SOLD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$102	$359	$636	$1,426
Class A	$655	$960	$1,287	$2,209
Class L	$188	$710	$1,260	$2,759
Class C	$313	$697	$1,208	$2,412
Class R6	$95	$337	$599	$1,346

Expense Example, No Redemption, By Year, Caption [Text]

If You HELD Your Shares

Expense Example, No Redemption [Table]


If You HELD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$102	$359	$636	$1,426
Class A	$655	$960	$1,287	$2,209
Class L	$188	$710	$1,260	$2,759
Class C	$213	$697	$1,208	$2,412
Class R6	$95	$337	$599	$1,346

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

97.00%

(MSIF - Counterpoint Global Portfolios) | Permanence Portfolio

Prospectus [Line Items]

Expense Heading [Optional Text]

Fees and Expenses

Expense Narrative [Text Block]

Expense Breakpoint Discounts [Text]

Expense Breakpoint, Minimum Investment Required [Amount]

$ 50,000

Other Expenses, New Fund, Based on Estimates [Text]

“Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees [Table]


	Class I	Class A	Class C	Class R6
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	None	5.25%	None	None
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption)	None	1.00%¹	1.00%²	None

^[29],[30]

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]


	Class I	Class A	Class C	Class R6
Advisory Fee¹	0.65%	0.65%	0.65%	0.65%
Distribution and/or Shareholder Service (12b-1) Fee	None	0.25%	1.00%	None
Other Expenses²	5.63%	6.07%	11.43%	8.34%
Total Annual Fund Operating Expenses³	6.28%	6.97%	13.08%	8.99%
Fee Waiver and/or Expense Reimbursement³	5.43%	5.77%	11.13%	8.19%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement³	0.85%	1.20%	1.95%	0.80%

^{[31],[32],[33]}

Expenses Deferred Charges [Text Block]

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.

Expense Example by, Year, Caption [Text]

If You SOLD Your Shares

Expense Example, With Redemption [Table]


If You SOLD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$87	$1,378	$2,637	$5,645
Class A	$641	$1,985	$3,277	$6,290
Class C	$298	$2,680	$4,778	$8,111
Class R6	$82	$1,881	$3,540	$7,141

Expense Example, No Redemption, By Year, Caption [Text]

If You HELD Your Shares

Expense Example, No Redemption [Table]


If You HELD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$87	$1,378	$2,637	$5,645
Class A	$641	$1,985	$3,277	$6,290
Class C	$198	$2,680	$4,778	$8,111
Class R6	$82	$1,881	$3,540	$7,141

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

61.00%

(MSIF - Counterpoint Global Portfolios) | Vitality Portfolio

Prospectus [Line Items]

Expense Heading [Optional Text]

Fees and Expenses

Expense Narrative [Text Block]

Expense Breakpoint Discounts [Text]

Expense Breakpoint, Minimum Investment Required [Amount]

$ 50,000

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees [Table]


	Class I	Class A	Class C	Class R6
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	None	5.25%	None	None
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption)	None	1.00%¹	1.00%²	None

^[34],[35]

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]


	Class I	Class A	Class C	Class R6
Advisory Fee	0.75%	0.75%	0.75%	0.75%
Distribution and/or Shareholder Service (12b-1) Fee	None	0.25%	1.00%	None
Other Expenses	12.93%	19.64%	20.08%	19.80%
Total Annual Fund Operating Expenses¹	13.68%	20.64%	21.83%	20.55%
Fee Waiver and/or Expense Reimbursement¹	12.73%	19.34%	19.78%	19.65%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement¹	0.95%	1.30%	2.05%	0.90%

^[36]

Expenses Deferred Charges [Text Block]

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.

Expense Example by, Year, Caption [Text]

If You SOLD Your Shares

Expense Example, With Redemption [Table]


If You SOLD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$97	$2,702	$4,874	$8,855
Class A	$650	$4,097	$6,550	$10,017
Class C	$308	$3,978	$6,586	$10,065
Class R6	$92	$3,731	$6,326	$10,008

Expense Example, No Redemption, By Year, Caption [Text]

If You HELD Your Shares

Expense Example, No Redemption [Table]


If You HELD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$97	$2,702	$4,874	$8,855
Class A	$650	$4,097	$6,550	$10,017
Class C	$208	$3,978	$6,586	$10,065
Class R6	$92	$3,731	$6,326	$10,008

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

27.00%

(MSIF - Opportunity Portfolios) | Asia Opportunity Portfolio

Prospectus [Line Items]

Expense Heading [Optional Text]

Fees and Expenses

Expense Narrative [Text Block]

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—Sales Charges Applicable to Purchases of Class A Shares”) 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 67 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.

Expense Breakpoint Discounts [Text]

Expense Breakpoint, Minimum Investment Required [Amount]

$ 50,000

Other Expenses, New Fund, Based on Estimates [Text]

“Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees [Table]


	Class I	Class A	Class C	Class R6
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	None	5.25%	None	None
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption)	None	1.00%¹	1.00%²	None
Redemption Fee (as a percentage of the amount redeemed on redemptions made within 30 days of purchase)	2.00%	2.00%	2.00%	2.00%

^[37],[38]

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]


	Class I	Class A	Class C	Class R6
Advisory Fee¹	0.80%	0.80%	0.80%	0.80%
Distribution and/or Shareholder Service (12b-1) Fee	None	0.25%	1.00%	None
Other Expenses²	0.51%	0.53%	0.57%	0.45%
Total Annual Fund Operating Expenses³	1.31%	1.58%	2.37%	1.25%
Fee Waiver and/or Expense Reimbursement³	0.21%	0.13%	0.17%	0.20%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement³	1.10%	1.45%	2.20%	1.05%

^{[39],[40],[41]}

Expenses Deferred Charges [Text Block]

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.

Expense Example by, Year, Caption [Text]

If You SOLD Your Shares

Expense Example, With Redemption [Table]


If You SOLD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$112	$395	$698	$1,561
Class A	$665	$986	$1,329	$2,294
Class C	$323	$723	$1,250	$2,496
Class R6	$107	$377	$667	$1,494

Expense Example, No Redemption, By Year, Caption [Text]

If You HELD Your Shares

Expense Example, No Redemption [Table]


If You HELD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$112	$395	$698	$1,561
Class A	$665	$986	$1,329	$2,294
Class C	$223	$723	$1,250	$2,496
Class R6	$107	$377	$667	$1,494

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

20.00%

(MSIF - Opportunity Portfolios) | Developing Opportunity Portfolio

Prospectus [Line Items]

Expense Heading [Optional Text]

Fees and Expenses

Expense Narrative [Text Block]

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—Sales Charges Applicable to Purchases of Class A Shares”) 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 67 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.

Expense Breakpoint Discounts [Text]

Expense Breakpoint, Minimum Investment Required [Amount]

$ 50,000

Other Expenses, New Fund, Based on Estimates [Text]

“Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees [Table]


	Class I	Class A	Class C	Class R6
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	None	5.25%	None	None
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption)	None	1.00%¹	1.00%²	None
Redemption Fee (as a percentage of the amount redeemed on redemptions made within 30 days of purchase)	2.00%	2.00%	2.00%	2.00%

^[42],[43]

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]


	Class I	Class A	Class C	Class R6
Advisory Fee¹	0.90%	0.90%	0.90%	0.90%
Distribution and/or Shareholder Service (12b-1) Fee	None	0.25%	1.00%	None
Other Expenses²^,³	1.04%	1.16%	1.16%	20.84%
Total Annual Fund Operating Expenses⁴	1.94%	2.31%	3.06%	21.74%
Fee Waiver and/or Expense Reimbursement⁴	0.78%	0.80%	0.80%	20.63%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement⁴	1.16%	1.51%	2.26%	1.11%

^{[44],[45],[46],[47]}

Expenses Deferred Charges [Text Block]

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.

Expense Example by, Year, Caption [Text]

If You SOLD Your Shares

Expense Example, With Redemption [Table]


If You SOLD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$118	$534	$975	$2,201
Class A	$671	$1,136	$1,627	$2,973
Class C	$329	$870	$1,536	$3,142
Class R6	$113	$3,906	$6,535	$10,099

Expense Example, No Redemption, By Year, Caption [Text]

If You HELD Your Shares

Expense Example, No Redemption [Table]


If You HELD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$118	$534	$975	$2,201
Class A	$671	$1,136	$1,627	$2,973
Class C	$229	$870	$1,536	$3,142
Class R6	$113	$3,906	$6,535	$10,099

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

51.00%

(MSIF - Opportunity Portfolios) | Global Opportunity Portfolio

Prospectus [Line Items]

Expense Heading [Optional Text]

Fees and Expenses

Expense Narrative [Text Block]

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—Sales Charges Applicable to Purchases of Class A Shares”) 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 67 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.

Expense Breakpoint Discounts [Text]

Expense Breakpoint, Minimum Investment Required [Amount]

$ 50,000

Other Expenses, New Fund, Based on Estimates [Text]

“Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees [Table]


	Class I	Class A	Class L	Class C	Class R6
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	None	5.25%	None	None	None
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption)	None	1.00%¹	None	1.00%²	None

^[48],[49]

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]


	Class I	Class A	Class L	Class C	Class R6
Advisory Fee¹	0.73%	0.73%	0.73%	0.73%	0.73%
Distribution and/or Shareholder Service (12b-1) Fee	None	0.25%	0.75%²	1.00%	None
Other Expenses³	0.21%	0.24%	0.29%	0.22%	0.12%
Total Annual Fund Operating Expenses	0.94%	1.22%	1.77%	1.95%	0.85%
Fee Waiver and/or Expense Reimbursement	0.00%	0.00%	0.45%²	0.00%	0.00%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	0.94%	1.22%	1.32%	1.95%	0.85%

^{[50],[51],[52]}

Expenses Deferred Charges [Text Block]

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.

Expense Example by, Year, Caption [Text]

If You SOLD Your Shares

Expense Example, With Redemption [Table]


If You SOLD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$96	$300	$520	$1,155
Class A	$643	$892	$1,160	$1,925
Class L	$134	$513	$917	$2,047
Class C	$298	$612	$1,052	$2,086
Class R6	$87	$271	$471	$1,049

Expense Example, No Redemption, By Year, Caption [Text]

If You HELD Your Shares

Expense Example, No Redemption [Table]


If You HELD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$96	$300	$520	$1,155
Class A	$643	$892	$1,160	$1,925
Class L	$134	$513	$917	$2,047
Class C	$198	$612	$1,052	$2,086
Class R6	$87	$271	$471	$1,049

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

11.00%

(MSIF - Opportunity Portfolios) | International Advantage Portfolio

Prospectus [Line Items]

Expense Heading [Optional Text]

Fees and Expenses

Expense Narrative [Text Block]

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—Sales Charges Applicable to Purchases of Class A Shares”) 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 67 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.

Expense Breakpoint Discounts [Text]

Expense Breakpoint, Minimum Investment Required [Amount]

$ 50,000

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees [Table]


	Class I	Class A	Class L	Class C	Class R6
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	None	5.25%	None	None	None
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption)	None	1.00%¹	None	1.00%²	None

^[53],[54]

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]


	Class I	Class A	Class L	Class C	Class R6
Advisory Fee¹	0.77%	0.77%	0.77%	0.77%	0.77%
Distribution and/or Shareholder Service (12b-1) Fee	None	0.25%	0.75%	1.00%	None
Other Expenses²	0.24%	0.28%	0.69%	0.28%	0.13%
Total Annual Fund Operating Expenses³	1.01%	1.30%	2.21%	2.05%	0.90%
Fee Waiver and/or Expense Reimbursement³	0.01%	0.00%	0.36%	0.00%	0.00%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement³	1.00%	1.30%	1.85%	2.05%	0.90%

^{[55],[56],[57]}

Expenses Deferred Charges [Text Block]

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.

Expense Example by, Year, Caption [Text]

If You SOLD Your Shares

Expense Example, With Redemption [Table]


If You SOLD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$102	$321	$557	$1,235
Class A	$650	$915	$1,200	$2,010
Class L	$188	$657	$1,152	$2,516
Class C	$308	$643	$1,103	$2,187
Class R6	$92	$287	$498	$1,108

Expense Example, No Redemption, By Year, Caption [Text]

If You HELD Your Shares

Expense Example, No Redemption [Table]


If You HELD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$102	$321	$557	$1,235
Class A	$650	$915	$1,200	$2,010
Class L	$188	$657	$1,152	$2,516
Class C	$208	$643	$1,103	$2,187
Class R6	$92	$287	$498	$1,108

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

13.00%

(MSIF - Opportunity Portfolios) | International Opportunity Portfolio

Prospectus [Line Items]

Expense Heading [Optional Text]

Fees and Expenses

Expense Narrative [Text Block]

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—Sales Charges Applicable to Purchases of Class A Shares”) 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 67 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.

Expense Breakpoint Discounts [Text]

Expense Breakpoint, Minimum Investment Required [Amount]

$ 50,000

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees [Table]


	Class I	Class A	Class L	Class C	Class R6
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	None	5.25%	None	None	None
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption)	None	1.00%¹	None	1.00%²	None
Redemption Fee (as a percentage of the amount redeemed on redemptions made within 30 days of purchase)	2.00%	2.00%	2.00%	2.00%	2.00%

^[58],[59]

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]


	Class I	Class A	Class L	Class C	Class R6
Advisory Fee¹	0.80%	0.80%	0.80%	0.80%	0.80%
Distribution and/or Shareholder Service (12b-1) Fee	None	0.25%	0.75%	1.00%	None
Other Expenses²	0.28%	0.30%	1.60%	0.31%	0.43%
Total Annual Fund Operating Expenses³	1.08%	1.35%	3.15%	2.11%	1.23%
Fee Waiver and/or Expense Reimbursement³	0.08%	0.00%	1.30%	0.01%	0.29%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement³	1.00%	1.35%	1.85%	2.10%	0.94%

^{[60],[61],[62]}

Expenses Deferred Charges [Text Block]

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:

Expense Example by, Year, Caption [Text]

If You SOLD Your Shares

Expense Example, With Redemption [Table]


If You SOLD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$102	$336	$588	$1,310
Class A	$655	$930	$1,226	$2,064
Class L	$188	$850	$1,536	$3,367
Class C	$313	$660	$1,133	$2,247
Class R6	$96	$362	$648	$1,463

Expense Example, No Redemption, By Year, Caption [Text]

If You HELD Your Shares

Expense Example, No Redemption [Table]


If You HELD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$102	$336	$588	$1,310
Class A	$655	$930	$1,226	$2,064
Class L	$188	$850	$1,536	$3,367
Class C	$213	$660	$1,133	$2,247
Class R6	$96	$362	$648	$1,463

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

25.00%

(MSIF - Applied Equity Portfolios) | Global Concentrated Portfolio

Prospectus [Line Items]

Expense Heading [Optional Text]

Fees and Expenses

Expense Narrative [Text Block]

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—Sales Charges Applicable to Purchases of Class A Shares”) 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 39 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.

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees [Table]


	Class I	Class A	Class C	Class R6
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	None	5.25%	None	None
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption)	None	1.00%¹	1.00%²	None

^[63],[64]

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]


	Class I	Class A	Class C	Class R6
Advisory Fee	0.75%	0.75%	0.75%	0.75%
Distribution and/or Shareholder Service (12b-1) Fee	None	0.25%	1.00%	None
Other Expenses	0.30%	0.33%	0.33%	6.30%
Total Annual Fund Operating Expenses¹	1.05%	1.33%	2.08%	7.05%
Fee Waiver and/or Expense Reimbursement¹	0.05%	0.00%	0.00%	6.10%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement¹	1.00%	1.33%	2.08%	0.95%

^[65]

Expenses Deferred Charges [Text Block]

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.

Expense Example by, Year, Caption [Text]

If You SOLD Your Shares

Expense Example, With Redemption [Table]


If You SOLD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$102	$329	$575	$1,278
Class A	$653	$924	$1,216	$2,042
Class C	$311	$652	$1,119	$2,219
Class R6	$97	$1,534	$2,913	$6,120

Expense Example, No Redemption, By Year, Caption [Text]

If You HELD Your Shares

Expense Example, No Redemption [Table]


If You HELD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$102	$329	$575	$1,278
Class A	$653	$924	$1,216	$2,042
Class C	$211	$652	$1,119	$2,219
Class R6	$97	$1,534	$2,913	$6,120

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

51.00%

(MSIF - Applied Equity Portfolios) | Global Core Portfolio

Prospectus [Line Items]

Expense Heading [Optional Text]

Fees and Expenses

Expense Narrative [Text Block]

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—Sales Charges Applicable to Purchases of Class A Shares”) 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 39 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.

Expense Breakpoint Discounts [Text]

Expense Breakpoint, Minimum Investment Required [Amount]

$ 50,000

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees [Table]


	Class I	Class A	Class C	Class R6
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	None	5.25%	None	None
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption)	None	1.00%¹	1.00%²	None

^[66],[67]

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]


	Class I	Class A	Class C	Class R6
Advisory Fee	0.75%	0.75%	0.75%	0.75%
Distribution and/or Shareholder Service (12b-1) Fee	None	0.25%	1.00%	None
Other Expenses	0.82%	0.85%	0.91%	15.84%
Total Annual Fund Operating Expenses¹	1.57%	1.85%	2.66%	16.59%
Fee Waiver and/or Expense Reimbursement¹	0.57%	0.50%	0.56%	15.64%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement¹	1.00%	1.35%	2.10%	0.95%

^[68]

Expenses Deferred Charges [Text Block]

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.

Expense Example by, Year, Caption [Text]

If You SOLD Your Shares

Expense Example, With Redemption [Table]


If You SOLD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$102	$440	$801	$1,819
Class A	$655	$1,030	$1,429	$2,542
Class C	$313	$773	$1,360	$2,755
Class R6	$97	$3,161	$5,556	$9,498

Expense Example, No Redemption, By Year, Caption [Text]

If You HELD Your Shares

Expense Example, No Redemption [Table]


If You HELD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$102	$440	$801	$1,819
Class A	$655	$1,030	$1,429	$2,542
Class C	$213	$773	$1,360	$2,755
Class R6	$97	$3,161	$5,556	$9,498

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

39.00%

(MSIF - Applied Equity Portfolios) | US Core Portfolio

Prospectus [Line Items]

Expense Heading [Optional Text]

Fees and Expenses

Expense Narrative [Text Block]

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—Sales Charges Applicable to Purchases of Class A Shares”) 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 39 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.

Expense Breakpoint Discounts [Text]

Expense Breakpoint, Minimum Investment Required [Amount]

$ 50,000

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees [Table]


	Class I	Class A	Class C	Class R6
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	None	5.25%	None	None
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption)	None	1.00%¹	1.00%²	None

^[69],[70]

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]


	Class I	Class A	Class C	Class R6
Advisory Fee	0.60%	0.60%	0.60%	0.60%
Distribution and/or Shareholder Service (12b-1) Fee	None	0.25%	1.00%	None
Other Expenses	0.27%	0.28%	0.29%	0.48%
Total Annual Fund Operating Expenses¹	0.87%	1.13%	1.89%	1.08%
Fee Waiver and/or Expense Reimbursement¹	0.07%	0.00%	0.00%	0.33%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement¹	0.80%	1.13%	1.89%	0.75%

^[71]

Expenses Deferred Charges [Text Block]

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.

Expense Example by, Year, Caption [Text]

If You SOLD Your Shares

Expense Example, With Redemption [Table]


If You SOLD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$82	$271	$475	$1,066
Class A	$634	$865	$1,115	$1,827
Class C	$292	$594	$1,021	$2,014
Class R6	$77	$311	$563	$1,287

Expense Example, No Redemption, By Year, Caption [Text]

If You HELD Your Shares

Expense Example, No Redemption [Table]


If You HELD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$82	$271	$475	$1,066
Class A	$634	$865	$1,115	$1,827
Class C	$192	$594	$1,021	$2,014
Class R6	$77	$311	$563	$1,287

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

42.00%

(MSIF - Growth Portfolio - Class IR) | Growth 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 Class IR shares of the Fund. The Fund does not charge any sales loads or other fees when you purchase or redeem Class IR shares. 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.

Other Expenses, New Fund, Based on Estimates [Text]

“Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.

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]


	Class IR
Advisory Fee¹	0.42%
Distribution and/or Shareholder Service (12b-1) Fee	None
Other Expenses²	9.76%
Total Annual Fund Operating Expenses³	10.18%
Fee Waiver and/or Expense Reimbursement³	9.45%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement³	0.73%

^{[72],[73],[74]}

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.

Expense Example by, Year, Caption [Text]

If You SOLD Your Shares

Expense Example, With Redemption [Table]


If You SOLD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class IR	$75	$2,089	$3,900	$7,668

Expense Example, No Redemption, By Year, Caption [Text]

If You HELD Your Shares

Expense Example, No Redemption [Table]


If You HELD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class IR	$75	$2,089	$3,900	$7,668

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

53.00%

(MSIF - Opportunity Portfolios - Class IR) | Global Opportunity Portfolio

Prospectus [Line Items]

Expense Heading [Optional Text]

Fees and Expenses

Expense Narrative [Text Block]

Other Expenses, New Fund, Based on Estimates [Text]

“Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.

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]


	Class IR
Advisory Fee¹	0.73%
Distribution and/or Shareholder Service (12b-1) Fee	None
Other Expenses²	0.28%
Total Annual Fund Operating Expenses³	1.01%
Fee Waiver and/or Expense Reimbursement³	0.06%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement³	0.95%

^{[75],[76],[77]}

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.

Expense Example by, Year, Caption [Text]

If You SOLD Your Shares

Expense Example, With Redemption [Table]


If You SOLD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class IR	$97	$316	$552	$1,231

Expense Example, No Redemption, By Year, Caption [Text]

If You HELD Your Shares

Expense Example, No Redemption [Table]


If You HELD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class IR	$97	$316	$552	$1,231

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

11.00%

(MSIF - Opportunity Portfolios - Class IR) | International Opportunity 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 Class IR shares of the Fund. The Fund does not charge any sales loads or other fees when you purchase Class IR shares. 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.

Other Expenses, New Fund, Based on Estimates [Text]

“Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees [Table]


	Class IR
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	None
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or net asset value per share (“NAV”) at redemption)	None
Redemption Fee (as a percentage of the amount redeemed on redemptions made within 30 days of purchase)	2.00%

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]


	Class IR
Advisory Fee¹	0.80%
Distribution and/or Shareholder Service (12b-1) Fee	None
Other Expenses²	15.10%
Total Annual Fund Operating Expenses³	15.90%
Fee Waiver and/or Expense Reimbursement³	14.96%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement³	0.94%

^{[78],[79],[80]}

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.

Expense Example by, Year, Caption [Text]

If You SOLD Your Shares

Expense Example, With Redemption [Table]


If You SOLD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class IR	$96	$3,054	$5,403	$9,369

Expense Example, No Redemption, By Year, Caption [Text]

If You HELD Your Shares

Expense Example, No Redemption [Table]


If You HELD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class IR	$96	$3,054	$5,403	$9,369

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

25.00%

(MSIF - Emerging Markets Equity Portfolios - Classes I, A, L, C and R6) | Passport Overseas Equity Portfolio

Prospectus [Line Items]

Expense Heading [Optional Text]

Fees and Expenses

Expense Narrative [Text Block]

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—Sales Charges Applicable to Purchases of Class A Shares”) 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 52 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.

Expense Breakpoint Discounts [Text]

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees [Table]


	Class I	Class A	Class L	Class C	Class R6
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	None	5.25%	None	None	None
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption)	None	1.00%¹	None	1.00%²	None

^[81],[82]

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]


	Class I	Class A	Class L	Class C	Class R6
Advisory Fee	0.65%	0.65%	0.65%	0.65%	0.65%
Distribution and/or Shareholder Service (12b-1) Fee	None	0.25%	0.75%	1.00%	None
Other Expenses	0.46%	0.49%	0.54%	1.30%	6.85%
Total Annual Fund Operating Expenses¹	1.11%	1.39%	1.94%	2.95%	7.50%
Fee Waiver and/or Expense Reimbursement¹	0.21%	0.14%	0.19%	0.95%	6.65%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement¹	0.90%	1.25%	1.75%	2.00%	0.85%

^[83]

Expenses Deferred Charges [Text Block]

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.

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:

Expense Example by, Year, Caption [Text]

If You SOLD Your Shares

Expense Example, With Redemption [Table]


If You SOLD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$92	$332	$591	$1,333
Class A	$646	$929	$1,233	$2,095
Class L	$178	$591	$1,029	$2,249
Class C	$303	$823	$1,469	$2,831
Class R6	$87	$1,610	$3,058	$6,374

Expense Example, No Redemption, By Year, Caption [Text]

If You HELD Your Shares

Expense Example, No Redemption [Table]


If You HELD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$92	$332	$591	$1,333
Class A	$646	$929	$1,233	$2,095
Class L	$178	$591	$1,029	$2,249
Class C	$203	$823	$1,469	$2,831
Class R6	$87	$1,610	$3,058	$6,374

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

36.00%

(MSIF - Emerging Markets Equity Portfolios - Classes I, A, L, C and R6) | Emerging Markets Leaders Portfolio

Prospectus [Line Items]

Expense Heading [Optional Text]

Fees and Expenses

Expense Narrative [Text Block]

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 Multi-Class Funds already held in Related Accounts (as defined in the section of the Prospectus entitled “Shareholder Information—Sales Charges Applicable to Purchases of Class A Shares”) 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 52 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.

Expense Breakpoint Discounts [Text]

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees [Table]


	Class I	Class A	Class C	Class R6
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	None	5.25%	None	None
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption)	None	1.00%¹	1.00%²	None
Redemption Fee (as a percentage of the amount redeemed on redemptions made within 30 days of purchase)	2.00%	2.00%	2.00%	2.00%

^[84],[85]

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]


	Class I	Class A	Class C	Class R6
Advisory Fee	0.75%	0.75%	0.75%	0.75%
Distribution and/or Shareholder Service (12b-1) Fee	None	0.25%	1.00%	None
Other Expenses	0.55%	0.60%	0.68%	1.79%
Total Annual Fund Operating Expenses¹	1.30%	1.60%	2.43%	2.54%
Fee Waiver and/or Expense Reimbursement¹	0.31%	0.25%	0.33%	1.59%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement¹	0.99%	1.35%	2.10%	0.95%

^[86]

Expenses Deferred Charges [Text Block]

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.

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:

Expense Example by, Year, Caption [Text]

If You SOLD Your Shares

Expense Example, With Redemption [Table]


If You SOLD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$101	$381	$683	$1,541
Class A	$655	$980	$1,328	$2,305
Class C	$313	$726	$1,266	$2,535
Class R6	$97	$639	$1,207	$2,756

Expense Example, No Redemption, By Year, Caption [Text]

If You HELD Your Shares

Expense Example, No Redemption [Table]


If You HELD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$101	$381	$683	$1,541
Class A	$655	$980	$1,328	$2,305
Class C	$213	$726	$1,266	$2,535
Class R6	$97	$639	$1,207	$2,756

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

59.00%

(MSIF - Emerging Markets Equity Portfolios - Classes I, A, L, C and R6) | Emerging Markets Portfolio

Prospectus [Line Items]

Expense Heading [Optional Text]

Fees and Expenses

Expense Narrative [Text Block]

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—Sales Charges Applicable to Purchases of Class A Shares”) 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 52 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.

Expense Breakpoint Discounts [Text]

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees [Table]


	Class I	Class A	Class L	Class C	Class R6
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	None	5.25%	None	None	None
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption)	None	1.00%¹	None	1.00%²	None
Redemption Fee (as a percentage of the amount redeemed on redemptions made within 30 days of purchase)	2.00%	2.00%	2.00%	2.00%	2.00%

^[87],[88]

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]


	Class I	Class A	Class L	Class C	Class R6
Advisory Fee	0.75%	0.75%	0.75%	0.75%	0.75%
Distribution and/or Shareholder Service (12b-1) Fee	None	0.25%	0.75%	1.00%	None
Other Expenses	0.40%	0.49%	1.52%	1.06%	0.28%
Total Annual Fund Operating Expenses¹	1.15%	1.49%	3.02%	2.81%	1.03%
Fee Waiver and/or Expense Reimbursement¹	0.16%	0.14%	1.17%	0.71%	0.08%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement¹	0.99%	1.35%	1.85%	2.10%	0.95%

^[89]

Expenses Deferred Charges [Text Block]

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.

Expense Example by, Year, Caption [Text]

If You SOLD Your Shares

Expense Example, With Redemption [Table]


If You SOLD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$101	$350	$618	$1,383
Class A	$655	$958	$1,283	$2,200
Class L	$188	$823	$1,484	$3,254
Class C	$313	$804	$1,421	$2,768
Class R6	$97	$320	$561	$1,252

Expense Example, No Redemption, By Year, Caption [Text]

If You HELD Your Shares

Expense Example, No Redemption [Table]


If You HELD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$101	$350	$618	$1,383
Class A	$655	$958	$1,283	$2,200
Class L	$188	$823	$1,484	$3,254
Class C	$213	$804	$1,421	$2,768
Class R6	$97	$320	$561	$1,252

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

30.00%

(MSIF - Emerging Markets Equity Portfolios - Class IR) | Passport Overseas Equity Portfolio

Prospectus [Line Items]

Expense Heading [Optional Text]

Fees and Expenses

Expense Narrative [Text Block]

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]


	Class IR
Advisory Fee	0.65%
Distribution and/or Shareholder Service (12b-1) Fee	None
Other Expenses	13.11%
Total Annual Fund Operating Expenses¹	13.76%
Fee Waiver and/or Expense Reimbursement¹	12.91%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement¹	0.85%

^[90]

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.

Expense Example by, Year, Caption [Text]

If You SOLD Your Shares

Expense Example, With Redemption [Table]


If You SOLD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class IR	$87	$2,707	$4,889	$8,875

Expense Example, No Redemption, By Year, Caption [Text]

If You HELD Your Shares

Expense Example, No Redemption [Table]


If You HELD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class IR	$87	$2,707	$4,889	$8,875

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

36.00%

(MSIF - Emerging Markets Equity Portfolios - Class IR) | Emerging Markets Leaders Portfolio

Prospectus [Line Items]

Expense Heading [Optional Text]

Fees and Expenses

Expense Narrative [Text Block]

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees [Table]


	Class IR
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	None
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption)	None
Redemption Fee (as a percentage of the amount redeemed on redemptions made within 30 days of purchase)	2.00%

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]


	Class IR
Advisory Fee	0.75%
Distribution and/or Shareholder Service (12b-1) Fee	None
Other Expenses	26.24%
Total Annual Fund Operating Expenses¹	26.99%
Fee Waiver and/or Expense Reimbursement¹	26.04%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement¹	0.95%

^[91]

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.

Expense Example by, Year, Caption [Text]

If You SOLD Your Shares

Expense Example, With Redemption [Table]


If You SOLD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class IR	$97	$4,546	$7,254	$10,248

Expense Example, No Redemption, By Year, Caption [Text]

If You HELD Your Shares

Expense Example, No Redemption [Table]


If You HELD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class IR	$97	$4,546	$7,254	$10,248

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

59.00%

(MSIF - Emerging Markets Equity Portfolios - Class IR) | Emerging Markets 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 Class IR shares of the Fund. The Fund does not charge any sales loads or other fees when you purchase Class IR shares. 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.

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees [Table]


	Class IR
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	None
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or net asset value per share (“NAV”) at redemption)	None
Redemption Fee (as a percentage of the amount redeemed on redemptions made within 30 days of purchase)	2.00%

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]


	Class IR
Advisory Fee	0.75%
Distribution and/or Shareholder Service (12b-1) Fee	None
Other Expenses	16.91%
Total Annual Fund Operating Expenses¹	17.66%
Fee Waiver and/or Expense Reimbursement¹	16.71%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement¹	0.95%

^[92]

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.

Expense Example by, Year, Caption [Text]

If You SOLD Your Shares

Expense Example, With Redemption [Table]


If You SOLD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class IR	$97	$3,321	$5,781	$9,672

Expense Example, No Redemption, By Year, Caption [Text]

If You HELD Your Shares

Expense Example, No Redemption [Table]


If You HELD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class IR	$97	$3,321	$5,781	$9,672

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

30.00%

(MSIF - International Equity Portfolios - Classes I, A, L, C and R6) | Global Franchise Portfolio

Prospectus [Line Items]

Expense Heading [Optional Text]

Fees and Expenses

Expense Narrative [Text Block]

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—Sales Charges Applicable to Purchases of Class A Shares”) 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 53 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.

Expense Breakpoint Discounts [Text]

Expense Breakpoint, Minimum Investment Required [Amount]

$ 50,000

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees [Table]


	Class I	Class A	Class L	Class C	Class R6
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	None	5.25%	None	None	None
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption)	None	1.00%¹	None	1.00%²	None

^[93],[94]

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]


	Class I	Class A	Class L	Class C	Class R6
Advisory Fee	0.73%	0.73%	0.73%	0.73%	0.73%
Distribution and/or Shareholder Service (12b-1) Fee	None	0.25%	0.75%	1.00%	None
Other Expenses	0.23%	0.23%	0.29%	0.22%	0.11%
Total Annual Fund Operating Expenses	0.96%	1.21%	1.77%	1.95%	0.84%

Expenses Deferred Charges [Text Block]

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.

Expense Example by, Year, Caption [Text]

If You SOLD Your Shares

Expense Example, With Redemption [Table]


If You SOLD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$98	$306	$531	$1,178
Class A	$642	$889	$1,155	$1,914
Class L	$180	$557	$959	$2,084
Class C	$298	$612	$1,052	$2,083
Class R6	$86	$268	$466	$1,037

Expense Example, No Redemption, By Year, Caption [Text]

If You HELD Your Shares

Expense Example, No Redemption [Table]


If You HELD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$98	$306	$531	$1,178
Class A	$642	$889	$1,155	$1,914
Class L	$180	$557	$959	$2,084
Class C	$198	$612	$1,052	$2,083
Class R6	$86	$268	$466	$1,037

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

35.00%

(MSIF - International Equity Portfolios - Classes I, A, L, C and R6) | Global Stars Portfolio

Prospectus [Line Items]

Expense Heading [Optional Text]

Fees and Expenses

Expense Narrative [Text Block]

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—Sales Charges Applicable to Purchases of Class A Shares”) 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 53 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.

Expense Breakpoint Discounts [Text]

Expense Breakpoint, Minimum Investment Required [Amount]

$ 50,000

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees [Table]


	Class I	Class A	Class L	Class C	Class R6
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	None	5.25%	None	None	None
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption)	None	1.00%¹	None	1.00%²	None

^[95],[96]

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]


	Class I	Class A	Class L	Class C	Class R6
Advisory Fee	0.65%	0.65%	0.65%	0.65%	0.65%
Distribution and/or Shareholder Service (12b-1) Fee	None	0.25%	0.75%	1.00%	None
Other Expenses	0.87%	0.98%	1.05%	0.97%	4.28%
Total Annual Fund Operating Expenses¹	1.52%	1.88%	2.45%	2.62%	4.93%
Fee Waiver and/or Expense Reimbursement¹	0.72%	0.73%	0.80%	0.72%	4.18%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement¹	0.80%	1.15%	1.65%	1.90%	0.75%

^[97]

Expenses Deferred Charges [Text Block]

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.

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:

Expense Example by, Year, Caption [Text]

If You SOLD Your Shares

Expense Example, With Redemption [Table]


If You SOLD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$82	$410	$761	$1,751
Class A	$636	$1,018	$1,423	$2,554
Class L	$168	$687	$1,233	$2,726
Class C	$293	$746	$1,326	$2,720
Class R6	$77	$1,105	$2,135	$4,717

Expense Example, No Redemption, By Year, Caption [Text]

If You HELD Your Shares

Expense Example, No Redemption [Table]


If You HELD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$82	$410	$761	$1,751
Class A	$636	$1,018	$1,423	$2,554
Class L	$168	$687	$1,233	$2,726
Class C	$193	$746	$1,326	$2,720
Class R6	$77	$1,105	$2,135	$4,717

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

49.00%

(MSIF - International Equity Portfolios - Classes I, A, L, C and R6) | International Equity Portfolio

Prospectus [Line Items]

Expense Heading [Optional Text]

Fees and Expenses

Expense Narrative [Text Block]

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—Sales Charges Applicable to Purchases of Class A Shares”) 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 53 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.

Expense Breakpoint Discounts [Text]

Expense Breakpoint, Minimum Investment Required [Amount]

$ 50,000

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees [Table]


	Class I	Class A	Class L	Class C	Class R6
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	None	5.25%	None	None	None
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption)	None	1.00%¹	None	1.00%²	None

^[98],[99]

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]


	Class I	Class A	Class L	Class C	Class R6
Advisory Fee	0.80%	0.80%	0.80%	0.80%	0.80%
Distribution and/or Shareholder Service (12b-1) Fee	None	0.25%	0.75%	1.00%	None
Other Expenses	0.28%	0.19%	0.39%	0.92%	0.19%
Total Annual Fund Operating Expenses¹	1.08%	1.24%	1.94%	2.72%	0.99%
Fee Waiver and/or Expense Reimbursement¹	0.13%	0.00%	0.14%	0.67%	0.08%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement¹	0.95%	1.24%	1.80%	2.05%	0.91%

^[100]

Expenses Deferred Charges [Text Block]

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.

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:

Expense Example by, Year, Caption [Text]

If You SOLD Your Shares

Expense Example, With Redemption [Table]


If You SOLD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$97	$331	$583	$1,306
Class A	$645	$898	$1,170	$1,946
Class L	$183	$596	$1,034	$2,253
Class C	$308	$781	$1,380	$2,642
Class R6	$93	$307	$539	$1,206

Expense Example, No Redemption, By Year, Caption [Text]

If You HELD Your Shares

Expense Example, No Redemption [Table]


If You HELD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$97	$331	$583	$1,306
Class A	$645	$898	$1,170	$1,946
Class L	$183	$596	$1,034	$2,253
Class C	$208	$781	$1,380	$2,642
Class R6	$93	$307	$539	$1,206

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

46.00%

(MSIF - International Equity Portfolios - Classes I, A, L, C and R6) | International Resilience Portfolio

Prospectus [Line Items]

Expense Heading [Optional Text]

Fees and Expenses

Expense Narrative [Text Block]

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—Sales Charges Applicable to Purchases of Class A Shares”) 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 53 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.

Expense Breakpoint Discounts [Text]

Expense Breakpoint, Minimum Investment Required [Amount]

$ 50,000

Shareholder Fees Caption [Optional Text]

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees [Table]


	Class I	Class A	Class C	Class R6
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	None	5.25%	None	None
Maximum deferred sales charge (load) (as a percentage based on the lesser of the offering price or NAV at redemption)	None	1.00%¹	1.00%²	None

^[101],[102]

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]


	Class I	Class A	Class C	Class R6
Advisory Fee	0.70%	0.70%	0.70%	0.70%
Distribution and/or Shareholder Service (12b-1) Fee	None	0.25%	1.00%	None
Other Expenses	15.21%	17.70%	18.40%	18.29%
Total Annual Fund Operating Expenses¹	15.91%	18.65%	20.10%	18.99%
Fee Waiver and/or Expense Reimbursement¹	15.06%	17.45%	18.15%	18.19%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement¹	0.85%	1.20%	1.95%	0.80%

^[103]

Expenses Deferred Charges [Text Block]

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.

Expense Example by, Year, Caption [Text]

If You SOLD Your Shares

Expense Example, With Redemption [Table]


If You SOLD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$87	$3,049	$5,400	$9,369
Class A	$641	$3,826	$6,200	$9,820
Class C	$298	$3,739	$6,291	$9,908
Class R6	$82	$3,505	$6,037	$9,848

Expense Example, No Redemption, By Year, Caption [Text]

If You HELD Your Shares

Expense Example, No Redemption [Table]


If You HELD Your Shares
	1 Year	3 Years	5 Years	10 Years
Class I	$87	$3,049	$5,400	$9,369
Class A	$641	$3,826	$6,200	$9,820
Class C	$198	$3,739	$6,291	$9,908
Class R6	$82	$3,505	$6,037	$9,848

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

Portfolio Turnover, Rate

57.00%

[1]

[2]

2	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.

[3]

“Advisory Fee” includes the management fee of a wholly-owned subsidiary of the Fund organized as a company under the laws of the Cayman Islands (the “Subsidiary”). The Fund’s “Adviser” and “Administrator,” Morgan Stanley Investment Management Inc., has agreed to waive or credit a portion of the advisory fee in an amount equal to the management fee paid to the Adviser by the Subsidiary.

[4]

The Fund’s “Distributor,” Morgan Stanley Distribution, Inc., has agreed to waive the 12b-1 fee on Class L shares of the Fund to the extent it exceeds 0.04% of the average daily net assets of such shares on an annualized basis. This waiver will continue for at least one year from the date of this Prospectus or until such time as the Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waiver when it deems such action is appropriate.

[5]

3	“Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.

[6]

The Adviser has agreed to waive all or a portion of its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 0.85% for Class I, 1.20% for Class A, 0.99% for Class L, 1.95% for Class C and 0.81% for Class R6. The 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 Board of Directors of the Company acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.

[7]

[8]

2	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.

[9]

The Fund’s “Adviser” and “Administrator,” Morgan Stanley Investment Management Inc., has agreed to waive all or a portion of its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 1.00% for Class I, 1.35% for Class A, 2.10% for Class C and 0.95% for Class R6. The 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 Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.

[10]

[11]

2	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.

[12]

[13]

2	“Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.

[14]

The Adviser has agreed to waive all or a portion of its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 1.00% for Class I, 1.32% for Class A, 1.85% for Class L, 2.10% for Class C and 0.95% for Class R6. The 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 Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.

[15]

[16]

2	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.

[17]

[18]

2	“Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.

[19]

The Adviser has agreed to waive all or a portion of its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 1.00% for Class I, 1.35% for Class A, 2.10% for Class C and 0.95% for Class R6. The 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 Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.

[20]

[21]

2	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.

[22]

[23]

2	“Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.

[24]

[25]

2	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.

[26]

[27]

2	“Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.

[28]

The Adviser has agreed to waive all or a portion of its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 1.00% for Class I, 1.35% for Class A, 1.85% for Class L, 2.10% for Class C and 0.93% for Class R6. The 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 Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.

[29]

[30]

2	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.

[31]

[32]

2	“Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.

[33]

The Adviser has agreed to waive all or a portion of its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 0.85% for Class I, 1.20% for Class A, 1.95% for Class C and 0.80% for Class R6. The 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 Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.

[34]

[35]

2	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.

[36]

The Fund’s “Adviser” and “Administrator,” Morgan Stanley Investment Management Inc., has agreed to waive all or a portion of its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 0.95% for Class I, 1.30% for Class A, 2.05% for Class C and 0.90% for Class R6. The 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 Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.

[37]

[38]

2	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.

[39]

[40]

2	“Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.

[41]

The Adviser has agreed to waive all or a portion of its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 1.10% for Class I, 1.45% for Class A, 2.20% for Class C and 1.05% for Class R6. The 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 Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.

[42]

[43]

2	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.

[44]

[45]

2	“Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.

[46]

Other Expenses include interest expense of 0.01% which is not included in the determination of the expense limitation. Excluding interest expense, Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement are 1.15%, 1.50%, 2.25% and 1.10% for Class I, Class A, Class C and Class R6, respectively.

[47]

The Adviser has agreed to waive all or a portion of its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 1.15% for Class I, 1.50% for Class A, 2.25% for Class C and 1.10% for Class R6. The 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 Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.

[48]

[49]

2	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.

[50]

[51]

The Fund’s “Distributor,” Morgan Stanley Distribution, Inc., has agreed to waive for at least one year the 12b-1 fee on Class L shares of the Fund to the extent it exceeds 0.30% of the average daily net assets of such shares on an annualized basis. This waiver will continue for at least one year from the date of this Prospectus or until such time as the Board of Directors of Morgan Stanley Institutional Fund Inc. (the “Company”) acts to discontinue all or a portion of such waiver when it deems such action is appropriate.

[52]

3	“Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.

[53]

[54]

2	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.

[55]

[56]

2	“Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.

[57]

The Adviser has agreed to waive all or a portion of its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 1.00% for Class I, 1.35% for Class A, 1.85% for Class L, 2.10% for Class C and 0.95% for Class R6. The 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 Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.

[58]

[59]

2	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.

[60]

[61]

2	“Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.

[62]

The Adviser has agreed to waive all or a portion of its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 1.00% for Class I, 1.35% for Class A, 1.85% for Class L, 2.10% for Class C and 0.94% for Class R6. The 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 Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.

[63]

[64]

2	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.

[65]

[66]

[67]

2	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.

[68]

[69]

[70]

2	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.

[71]

The Fund’s “Adviser” and “Administrator,” Morgan Stanley Investment Management Inc., has agreed to waive all or a portion of its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 0.80% for Class I, 1.15% for Class A, 1.90% for Class C and 0.75% for Class R6. The 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 Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.

[72]

[73]

2	“Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.

[74]

The Adviser has agreed to waive all or a portion of its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 0.73% for Class IR. The 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 Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.

[75]

[76]

2	“Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.

[77]

The Adviser has agreed to waive all or a portion of its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 0.95% for Class IR. The 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 Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.

[78]

[79]

2	“Other Expenses” include expenses of the Fund’s and Subsidiary’s most recent fiscal year.

[80]

The Adviser has agreed to waive all or a portion of its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 0.94% for Class IR. The 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 Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.

[81]

[82]

2	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.

[83]

The Fund’s “Adviser” and “Administrator,” Morgan Stanley Investment Management Inc., has agreed to waive all or a portion of its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 0.90% for Class I, 1.25% for Class A, 1.75% for Class L, 2.00% for Class C and 0.85% for Class R6. The 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 Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.

[84]

[85]

2	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.

[86]

The Fund’s “Adviser” and “Administrator,” Morgan Stanley Investment Management Inc., has agreed to waive all or a portion of its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 0.99% for Class I, 1.35% for Class A, 2.10% for Class C and 0.95% for Class R6. The 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 Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.

[87]

[88]

2	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.

[89]

The Fund’s “Adviser” and “Administrator,” Morgan Stanley Investment Management Inc., has agreed to waive all or a portion of its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 0.99% for Class I, 1.35% for Class A, 1.85% for Class L, 2.10% for Class C and 0.95% for Class R6. The 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 Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.

[90]

The Fund’s “Adviser” and “Administrator,” Morgan Stanley Investment Management Inc., has agreed to waive all or a portion of its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 0.85% for Class IR. The 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 Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.

[91]

The Fund’s “Adviser” and “Administrator,” Morgan Stanley Investment Management Inc., has agreed to waive all or a portion of its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 0.95% for Class IR. The 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 Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.

[92]

The Fund’s “Adviser” and “Administrator,” Morgan Stanley Investment Management Inc., has agreed to waive all or a portion of its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 0.95% for Class IR. The 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 Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.

[93]

[94]

2	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.

[95]

[96]

2	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.

[97]

The Fund’s “Adviser” and “Administrator,” Morgan Stanley Investment Management Inc., has agreed to waive all or a portion of its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 0.80% for Class I, 1.15% for Class A, 1.65% for Class L, 1.90% for Class C and 0.75% for Class R6. The 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 Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.

[98]

[99]

2	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.

[100]

The Fund’s “Adviser” and “Administrator,” Morgan Stanley Investment Management Inc., has agreed to waive all or a portion of its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 0.95% for Class I, 1.30% for Class A, 1.80% for Class L, 2.05% for Class C and 0.91% for Class R6. The 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 Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.

[101]

[102]

2	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.

[103]

The Fund’s “Adviser” and “Administrator,” Morgan Stanley Investment Management Inc., has agreed to waive all or a portion of its advisory fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding acquired fund fees and expenses (as applicable), certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 0.85% for Class I, 1.20% for Class A, 1.95% for Class C and 0.80% for Class R6. The 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 Board of Directors of Morgan Stanley Institutional Fund, Inc. (the “Company”) acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.