| Document and Entity Information | Oct. 22, 2019 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Oct. 22, 2019 |
| Entity Registrant Name | MANHATTAN ASSOCIATES INC |
| Entity Central Index Key | 0001056696 |
| Entity Emerging Growth Company | false |
| Entity File Number | 0-23999 |
| Entity Incorporation, State or Country Code | 2Q |
| Entity Tax Identification Number | 58-2373424 |
| Entity Address, Address Line One | 2300 Windy Ridge Parkway |
| Entity Address, Address Line Two | Tenth Floor |
| Entity Address, City or Town | Atlanta |
| Entity Address, State or Province | GA |
| Entity Address, Postal Zip Code | 30339 |
| City Area Code | (770) |
| Local Phone Number | 955-7070 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of each class | Common stock |
| Trading Symbol | MANH |
| Name of each exchange on which registered | NASDAQ |
