| Label | Element | Value |
|---|---|---|
| Risk/Return: | rr_RiskReturnAbstract | |
| Entity Registrant Name | dei_EntityRegistrantName | TOUCHSTONE INVESTMENT TRUST |
| Entity Central Index Key | dei_EntityCentralIndexKey | 0000066117 |
| Document Creation Date | dei_DocumentCreationDate | Feb. 19, 2015 |
| Document Effective Date | dei_DocumentEffectiveDate | Feb. 19, 2015 |
| Prospectus Date | rr_ProspectusDate | Jan. 30, 2015 |