v3.26.3
Form N-1A Cover
Oct. 01, 2026
Prospectus [Line Items]  
Document Type 497
Amendment Flag false
Registrant Name MORGAN STANLEY INSTITUTIONAL FUND INC
Entity Central Index Key 0000836487
Entity Investment Company Type N-1A
Document Period End Date Oct. 01, 2026
Prospectus Date Apr. 30, 2026