v3.26.1
Shareholder Fees
Dec. 31, 2025
(MSIF - Counterpoint Global Portfolios) | Advantage Portfolio | Class I  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - Counterpoint Global Portfolios) | Advantage Portfolio | Class A  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 5.25%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [1]
(MSIF - Counterpoint Global Portfolios) | Advantage Portfolio | Class L  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - Counterpoint Global Portfolios) | Advantage Portfolio | Class C  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [2]
(MSIF - Counterpoint Global Portfolios) | Advantage Portfolio | Class R6  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - Counterpoint Global Portfolios) | Global Endurance Portfolio | Class I  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - Counterpoint Global Portfolios) | Global Endurance Portfolio | Class A  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 5.25%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [3]
(MSIF - Counterpoint Global Portfolios) | Global Endurance Portfolio | Class C  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [4]
(MSIF - Counterpoint Global Portfolios) | Global Endurance Portfolio | Class R6  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - Counterpoint Global Portfolios) | Global Insight Portfolio | Class I  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - Counterpoint Global Portfolios) | Global Insight Portfolio | Class A  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 5.25%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [5]
(MSIF - Counterpoint Global Portfolios) | Global Insight Portfolio | Class L  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - Counterpoint Global Portfolios) | Global Insight Portfolio | Class C  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [6]
(MSIF - Counterpoint Global Portfolios) | Global Insight Portfolio | Class R6  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - Counterpoint Global Portfolios) | Global Permanence Portfolio | Class I  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - Counterpoint Global Portfolios) | Global Permanence Portfolio | Class A  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 5.25%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [7]
(MSIF - Counterpoint Global Portfolios) | Global Permanence Portfolio | Class C  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [8]
(MSIF - Counterpoint Global Portfolios) | Global Permanence Portfolio | Class R6  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - Counterpoint Global Portfolios) | Growth Portfolio | Class I  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - Counterpoint Global Portfolios) | Growth Portfolio | Class A  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 5.25%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [9]
(MSIF - Counterpoint Global Portfolios) | Growth Portfolio | Class L  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - Counterpoint Global Portfolios) | Growth Portfolio | Class C  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [10]
(MSIF - Counterpoint Global Portfolios) | Growth Portfolio | Class R6  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - Counterpoint Global Portfolios) | Inception Portfolio | Class I  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
Redemption Fee (as a percentage of Amount Redeemed) (2.00%)
(MSIF - Counterpoint Global Portfolios) | Inception Portfolio | Class A  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 5.25%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [11]
Redemption Fee (as a percentage of Amount Redeemed) (2.00%)
(MSIF - Counterpoint Global Portfolios) | Inception Portfolio | Class L  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
Redemption Fee (as a percentage of Amount Redeemed) (2.00%)
(MSIF - Counterpoint Global Portfolios) | Inception Portfolio | Class C  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [12]
Redemption Fee (as a percentage of Amount Redeemed) (2.00%)
(MSIF - Counterpoint Global Portfolios) | Inception Portfolio | Class R6  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
Redemption Fee (as a percentage of Amount Redeemed) (2.00%)
(MSIF - Counterpoint Global Portfolios) | Permanence Portfolio | Class I  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - Counterpoint Global Portfolios) | Permanence Portfolio | Class A  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 5.25%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [13]
(MSIF - Counterpoint Global Portfolios) | Permanence Portfolio | Class C  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [14]
(MSIF - Counterpoint Global Portfolios) | Permanence Portfolio | Class R6  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - Counterpoint Global Portfolios) | Vitality Portfolio | Class I  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - Counterpoint Global Portfolios) | Vitality Portfolio | Class A  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 5.25%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [15]
(MSIF - Counterpoint Global Portfolios) | Vitality Portfolio | Class C  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [16]
(MSIF - Counterpoint Global Portfolios) | Vitality Portfolio | Class R6  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - Opportunity Portfolios) | Asia Opportunity Portfolio | Class I  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage) 0.00%
Redemption Fee (as a percentage of Amount Redeemed) (2.00%)
(MSIF - Opportunity Portfolios) | Asia Opportunity Portfolio | Class A  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 5.25%
Maximum Deferred Sales Charge (as a percentage) 1.00% [17]
Redemption Fee (as a percentage of Amount Redeemed) (2.00%)
(MSIF - Opportunity Portfolios) | Asia Opportunity Portfolio | Class C  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage) 1.00% [18]
Redemption Fee (as a percentage of Amount Redeemed) (2.00%)
(MSIF - Opportunity Portfolios) | Asia Opportunity Portfolio | Class R6  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage) 0.00%
Redemption Fee (as a percentage of Amount Redeemed) (2.00%)
(MSIF - Opportunity Portfolios) | Developing Opportunity Portfolio | Class I  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage) 0.00%
Redemption Fee (as a percentage of Amount Redeemed) (2.00%)
(MSIF - Opportunity Portfolios) | Developing Opportunity Portfolio | Class A  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 5.25%
Maximum Deferred Sales Charge (as a percentage) 1.00% [19]
Redemption Fee (as a percentage of Amount Redeemed) (2.00%)
(MSIF - Opportunity Portfolios) | Developing Opportunity Portfolio | Class C  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage) 1.00% [20]
Redemption Fee (as a percentage of Amount Redeemed) (2.00%)
(MSIF - Opportunity Portfolios) | Developing Opportunity Portfolio | Class R6  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage) 0.00%
Redemption Fee (as a percentage of Amount Redeemed) (2.00%)
(MSIF - Opportunity Portfolios) | Global Opportunity Portfolio | Class I  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - Opportunity Portfolios) | Global Opportunity Portfolio | Class A  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 5.25%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [21]
(MSIF - Opportunity Portfolios) | Global Opportunity Portfolio | Class L  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - Opportunity Portfolios) | Global Opportunity Portfolio | Class C  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [22]
(MSIF - Opportunity Portfolios) | Global Opportunity Portfolio | Class R6  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - Opportunity Portfolios) | International Advantage Portfolio | Class I  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - Opportunity Portfolios) | International Advantage Portfolio | Class A  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 5.25%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [23]
(MSIF - Opportunity Portfolios) | International Advantage Portfolio | Class L  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - Opportunity Portfolios) | International Advantage Portfolio | Class C  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [24]
(MSIF - Opportunity Portfolios) | International Advantage Portfolio | Class R6  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - Opportunity Portfolios) | International Opportunity Portfolio | Class I  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
Redemption Fee (as a percentage of Amount Redeemed) (2.00%)
(MSIF - Opportunity Portfolios) | International Opportunity Portfolio | Class A  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 5.25%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [25]
Redemption Fee (as a percentage of Amount Redeemed) (2.00%)
(MSIF - Opportunity Portfolios) | International Opportunity Portfolio | Class L  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
Redemption Fee (as a percentage of Amount Redeemed) (2.00%)
(MSIF - Opportunity Portfolios) | International Opportunity Portfolio | Class C  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [26]
Redemption Fee (as a percentage of Amount Redeemed) (2.00%)
(MSIF - Opportunity Portfolios) | International Opportunity Portfolio | Class R6  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
Redemption Fee (as a percentage of Amount Redeemed) (2.00%)
(MSIF - Applied Equity Portfolios) | Global Concentrated Portfolio | Class I  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - Applied Equity Portfolios) | Global Concentrated Portfolio | Class A  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 5.25%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [27]
(MSIF - Applied Equity Portfolios) | Global Concentrated Portfolio | Class C  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [28]
(MSIF - Applied Equity Portfolios) | Global Concentrated Portfolio | Class R6  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - Applied Equity Portfolios) | Global Core Portfolio | Class I  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - Applied Equity Portfolios) | Global Core Portfolio | Class A  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 5.25%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [29]
(MSIF - Applied Equity Portfolios) | Global Core Portfolio | Class C  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [30]
(MSIF - Applied Equity Portfolios) | Global Core Portfolio | Class R6  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - Applied Equity Portfolios) | US Core Portfolio | Class I  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - Applied Equity Portfolios) | US Core Portfolio | Class A  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 5.25%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [31]
(MSIF - Applied Equity Portfolios) | US Core Portfolio | Class C  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [32]
(MSIF - Applied Equity Portfolios) | US Core Portfolio | Class R6  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - Opportunity Portfolios - Class IR) | International Opportunity Portfolio | Class IR  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
Redemption Fee (as a percentage of Amount Redeemed) (2.00%)
(MSIF - Emerging Markets Equity Portfolios - Classes I, A, L, C and R6) | Passport Overseas Equity Portfolio | Class I  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage) 0.00%
(MSIF - Emerging Markets Equity Portfolios - Classes I, A, L, C and R6) | Passport Overseas Equity Portfolio | Class A  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 5.25%
Maximum Deferred Sales Charge (as a percentage) 1.00% [33]
(MSIF - Emerging Markets Equity Portfolios - Classes I, A, L, C and R6) | Passport Overseas Equity Portfolio | Class L  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage) 0.00%
(MSIF - Emerging Markets Equity Portfolios - Classes I, A, L, C and R6) | Passport Overseas Equity Portfolio | Class C  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage) 1.00% [34]
(MSIF - Emerging Markets Equity Portfolios - Classes I, A, L, C and R6) | Passport Overseas Equity Portfolio | Class R6  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage) 0.00%
(MSIF - Emerging Markets Equity Portfolios - Classes I, A, L, C and R6) | Emerging Markets Leaders Portfolio | Class I  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage) 0.00%
Redemption Fee (as a percentage of Amount Redeemed) (2.00%)
(MSIF - Emerging Markets Equity Portfolios - Classes I, A, L, C and R6) | Emerging Markets Leaders Portfolio | Class A  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 5.25%
Maximum Deferred Sales Charge (as a percentage) 1.00% [35]
Redemption Fee (as a percentage of Amount Redeemed) (2.00%)
(MSIF - Emerging Markets Equity Portfolios - Classes I, A, L, C and R6) | Emerging Markets Leaders Portfolio | Class C  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage) 1.00% [36]
Redemption Fee (as a percentage of Amount Redeemed) (2.00%)
(MSIF - Emerging Markets Equity Portfolios - Classes I, A, L, C and R6) | Emerging Markets Leaders Portfolio | Class R6  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage) 0.00%
Redemption Fee (as a percentage of Amount Redeemed) (2.00%)
(MSIF - Emerging Markets Equity Portfolios - Classes I, A, L, C and R6) | Emerging Markets Portfolio | Class I  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage) 0.00%
Redemption Fee (as a percentage of Amount Redeemed) (2.00%)
(MSIF - Emerging Markets Equity Portfolios - Classes I, A, L, C and R6) | Emerging Markets Portfolio | Class A  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 5.25%
Maximum Deferred Sales Charge (as a percentage) 1.00% [37]
Redemption Fee (as a percentage of Amount Redeemed) (2.00%)
(MSIF - Emerging Markets Equity Portfolios - Classes I, A, L, C and R6) | Emerging Markets Portfolio | Class L  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage) 0.00%
Redemption Fee (as a percentage of Amount Redeemed) (2.00%)
(MSIF - Emerging Markets Equity Portfolios - Classes I, A, L, C and R6) | Emerging Markets Portfolio | Class C  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage) 1.00% [38]
Redemption Fee (as a percentage of Amount Redeemed) (2.00%)
(MSIF - Emerging Markets Equity Portfolios - Classes I, A, L, C and R6) | Emerging Markets Portfolio | Class R6  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage) 0.00%
Redemption Fee (as a percentage of Amount Redeemed) (2.00%)
(MSIF - Emerging Markets Equity Portfolios - Class IR) | Emerging Markets Leaders Portfolio | Class IR  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage) 0.00%
Redemption Fee (as a percentage of Amount Redeemed) (2.00%)
(MSIF - Emerging Markets Equity Portfolios - Class IR) | Emerging Markets Portfolio | Class IR  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage) 0.00%
Redemption Fee (as a percentage of Amount Redeemed) (2.00%)
(MSIF - International Equity Portfolios - Classes I, A, L, C and R6) | Global Franchise Portfolio | Class I  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - International Equity Portfolios - Classes I, A, L, C and R6) | Global Franchise Portfolio | Class A  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 5.25%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [39]
(MSIF - International Equity Portfolios - Classes I, A, L, C and R6) | Global Franchise Portfolio | Class L  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - International Equity Portfolios - Classes I, A, L, C and R6) | Global Franchise Portfolio | Class C  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [40]
(MSIF - International Equity Portfolios - Classes I, A, L, C and R6) | Global Franchise Portfolio | Class R6  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - International Equity Portfolios - Classes I, A, L, C and R6) | Global Stars Portfolio | Class I  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - International Equity Portfolios - Classes I, A, L, C and R6) | Global Stars Portfolio | Class A  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 5.25%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [41]
(MSIF - International Equity Portfolios - Classes I, A, L, C and R6) | Global Stars Portfolio | Class L  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - International Equity Portfolios - Classes I, A, L, C and R6) | Global Stars Portfolio | Class C  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [42]
(MSIF - International Equity Portfolios - Classes I, A, L, C and R6) | Global Stars Portfolio | Class R6  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - International Equity Portfolios - Classes I, A, L, C and R6) | International Equity Portfolio | Class I  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - International Equity Portfolios - Classes I, A, L, C and R6) | International Equity Portfolio | Class A  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 5.25%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [43]
(MSIF - International Equity Portfolios - Classes I, A, L, C and R6) | International Equity Portfolio | Class L  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - International Equity Portfolios - Classes I, A, L, C and R6) | International Equity Portfolio | Class C  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [44]
(MSIF - International Equity Portfolios - Classes I, A, L, C and R6) | International Equity Portfolio | Class R6  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - International Equity Portfolios - Classes I, A, L, C and R6) | International Resilience Portfolio | Class I  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
(MSIF - International Equity Portfolios - Classes I, A, L, C and R6) | International Resilience Portfolio | Class A  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 5.25%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [45]
(MSIF - International Equity Portfolios - Classes I, A, L, C and R6) | International Resilience Portfolio | Class C  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00% [46]
(MSIF - International Equity Portfolios - Classes I, A, L, C and R6) | International Resilience Portfolio | Class R6  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
[1]
1 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.
[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]
1 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.
[4]
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.
[5]
1 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.
[6]
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.
[7]
1 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.
[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]
1 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.
[10]
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.
[11]
1 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.
[12]
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.
[13]
1 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.
[14]
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.
[15]
1 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.
[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]
1 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.
[18]
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.
[19]
1 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.
[20]
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.
[21]
1 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.
[22]
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.
[23]
1 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.
[24]
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.
[25]
1 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.
[26]
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.
[27]
1 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.
[28]
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.
[29]
1 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.
[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]
1 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.
[32]
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.
[33]
1 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.
[34]
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.
[35]
1 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.
[36]
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.
[37]
1 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.
[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]
1 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.
[40]
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.
[41]
1 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.
[42]
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.
[43]
1 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.
[44]
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.
[45]
1 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.
[46]
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.