v3.24.4
Label Element Value
Risk Return Abstract rr_RiskReturnAbstract  
Document Type dei_DocumentType 485BPOS
Period End Date dei_DocumentPeriodEndDate Aug. 31, 2024
Registrant Name dei_EntityRegistrantName PIONEER SERIES TRUST III
CIK dei_EntityCentralIndexKey 0001306349
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Dec. 20, 2024
Document Effective Date dei_DocumentEffectiveDate Dec. 31, 2024
Prospectus Date rr_ProspectusDate Dec. 31, 2024
Entity Inv Company Type dei_EntityInvCompanyType N-1A
Pioneer Disciplined Value Fund | A  
Risk Return Abstract rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol CVFCX
Pioneer Disciplined Value Fund | C  
Risk Return Abstract rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol CVCFX
Pioneer Disciplined Value Fund | K  
Risk Return Abstract rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol CVKFX
Pioneer Disciplined Value Fund | R  
Risk Return Abstract rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol CVRFX
Pioneer Disciplined Value Fund | Y  
Risk Return Abstract rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol CVFYX