| Cover | Aug. 28, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Aug. 28, 2024 |
| Entity Registrant Name | Affirm Holdings, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-39888 |
| Entity Tax Identification Number | 84-2224323 |
| Entity Address, Address Line One | 650 California Street |
| Entity Address, City or Town | San Francisco |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94108 |
| City Area Code | 415 |
| Local Phone Number | 960-1518 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class A common stock, $0.00001 par value |
| Trading Symbol | AFRM |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Central Index Key | 0001820953 |
