Document and Entity Information |
3 Months Ended |
|---|---|
Dec. 31, 2025 | |
| Cover [Abstract] | |
| Entity Registrant Name | TFS Financial Corporation |
| Amendment Flag | false |
| Entity Central Index Key | 0001381668 |
| Document Type | 11-K |
| Document Information [Line Items] | |
| Entity Registrant Name | TFS Financial Corporation |
| Document Type | 11-K |
| Entity Central Index Key | 0001381668 |
| Amendment Flag | false |
| EBP Third Federal 401(k) Savings Plan | |
| Cover [Abstract] | |
| Entity Registrant Name | TFS Financial Corporation |
| Amendment Flag | false |
| Entity Central Index Key | 0001381668 |
| Document Type | 11-K |
| Document Information [Line Items] | |
| Entity Registrant Name | TFS Financial Corporation |
| Document Type | 11-K |
| Entity Tax Identification Number | 34-0573493 |
| Entity Central Index Key | 0001381668 |
| Amendment Flag | false |