MainStay MacKay DefinedTerm Municipal Opportunities Fund (MMD)
Company Profile
| Document and Entity Information | Jul. 25, 2024 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001518557 |
| Current Fiscal Year End Date | --05-31 |
| Document Type | 8-K |
| Document Period End Date | Jul. 25, 2024 |
| Entity Registrant Name | MAINSTAY MACKAY DEFINEDTERM MUNICIPAL OPPORTUNITIES FUND |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 811-22551 |
| Entity Tax Identification Number | 45-1681733 |
| Entity Address, Address Line One | 51 Madison Avenue |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10010 |
| City Area Code | (212) |
| Local Phone Number | 576-7000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, par value $0.001 per share |
| Trading Symbol | MMD |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |