v3.22.2.2
Label Element Value
Risk Return Abstract rr_RiskReturnAbstract  
Document Type dei_DocumentType 485BPOS
Period End Date dei_DocumentPeriodEndDate Sep. 30, 2022
Registrant Name dei_EntityRegistrantName Prudential Jennison Small Company Fund, Inc.
CIK dei_EntityCentralIndexKey 0000318531
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Nov. 29, 2022
Effective Date dei_DocumentEffectiveDate Nov. 26, 2022
Prospectus Date rr_ProspectusDate Nov. 26, 2022
Entity Inv Company Type dei_EntityInvCompanyType N-1A
PGIM Jennison Small Company Fund | Z  
Risk Return Abstract rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol PSCZX
PGIM Jennison Small Company Fund | R2  
Risk Return Abstract rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol PSCHX
PGIM Jennison Small Company Fund | R4  
Risk Return Abstract rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol PSCJX
PGIM Jennison Small Company Fund | R6  
Risk Return Abstract rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol PJSQX