XML 13 R10.htm IDEA: XBRL DOCUMENT v3.8.0.1
Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName FRANKLIN HIGH INCOME TRUST
Prospectus Date rr_ProspectusDate Oct. 01, 2017
Document Creation Date dei_DocumentCreationDate Sep. 26, 2017