Risk Return Summary [Abstract] Risk Return Summary [Abstract] Prospectus: Prospectus: Document Information, Document [Axis] Document Information, Document [Axis] Document [Domain] Document [Domain] Touchstone Micro Cap Value Fund (Prospectus Summary) [Member] Touchstone Micro Cap Value Fund (Prospectus Summary) Touchstone Micro Cap Value Fund (Prospectus Summary) [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] S000038006 [Member] Touchstone Micro Cap Value Fund S000038006 [Member] Share Class [Axis] Share Class [Axis] Share Classes Share Classes C000117268 [Member] Class A C000117268 [Member] C000117269 [Member] Class C C000117269 [Member] C000117270 [Member] Class Y C000117270 [Member] C000117271 [Member] Institutional Class C000117271 [Member] Risk/Return: Risk/Return: Document Type Document Type Document Period End Date Document Period End Date Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Amendment Flag Amendment Flag Trading Symbol Trading Symbol Document Creation Date Document Creation Date Document Effective Date Document Effective Date Prospectus Date Prospectus Date Risk/Return [Heading] Risk/Return, Heading Supplement [Text Block] Supplement Text Strategy [Heading] Strategy, Heading Strategy Narrative [Text Block] Investment Strategy, Narrative Risk [Heading] Risk, Heading Risk Narrative [Text Block] Risk, Narrative Supplement Closing [Text Block] Supplement Closing Strategy Portfolio Concentration [Text] Strategy Portfolio Concentration Text