| Cover | Apr. 20, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Apr. 20, 2022 |
| Entity File Number | 0-51726 |
| Entity Registrant Name | MAGYAR BANCORP, INC. |
| Entity Central Index Key | 0001337068 |
| Entity Tax Identification Number | 20-4154978 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 400 Somerset Street |
| Entity Address, City or Town | New Brunswick |
| Entity Address, State or Province | NJ |
| Entity Address, Postal Zip Code | 08901 |
| City Area Code | (732) |
| Local Phone Number | 342-7600 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.01 per share |
| Trading Symbol | MGYR |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Information, Former Legal or Registered Name | Not Applicable |
