| Document and Entity Information | Aug. 12, 2021 |
| Document and Entity Information [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Aug. 12, 2021 |
| Entity File Number | 001-40361 |
| Entity Registrant Name | AGILITI, INC. \DE |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 83-1608463 |
| Entity Address, Address Line One | 6625 West 78th Street |
| Entity Address, Adress Line Two | Suite 300 |
| Entity Address, City or Town | Minneapolis |
| Entity Address, State or Province | MN |
| Entity Address, Postal Zip Code | 55439 |
| City Area Code | 952 |
| Local Phone Number | 893-3200 |
| Title of 12(b) Security | Common Stock, par value $0.0001 |
| Trading Symbol | AGTI |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001749704 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Amendment Flag | false |
