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CVIEs and CSIPs - Schedule of debt of consolidated VIEs and consolidated SIPs (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Sep. 30, 2014
Consolidated variable interest entities [Member]    
Variable Interest Entities and Consolidated Sponsored Investment Products [Line Items]    
Debt of consolidated variable interest entities $ 795.5ben_DebtOfConsolidatedVariableInterestEntities
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		 $ 828.5ben_DebtOfConsolidatedVariableInterestEntities
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Effective Interest Rate 1.48%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		 1.43%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Consolidated sponsored investment products [Member]    
Variable Interest Entities and Consolidated Sponsored Investment Products [Line Items]    
Debt of consolidated sponsored investment products 105.7ben_DebtOfConsolidatedSponsoredInvestmentProducts
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= ben_ConsolidatedSponsoredInvestmentProductsMember		 122.3ben_DebtOfConsolidatedSponsoredInvestmentProducts
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= ben_ConsolidatedSponsoredInvestmentProductsMember
Effective Interest Rate 4.10%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= ben_ConsolidatedSponsoredInvestmentProductsMember		 3.87%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= ben_ConsolidatedSponsoredInvestmentProductsMember
Total VIEs and SIPs [Member]    
Variable Interest Entities and Consolidated Sponsored Investment Products [Line Items]    
Debt of consolidated variable interest entities 795.5ben_DebtOfConsolidatedVariableInterestEntities
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= ben_TotalViesAndSipsMember		 828.5ben_DebtOfConsolidatedVariableInterestEntities
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= ben_TotalViesAndSipsMember
Debt of consolidated sponsored investment products 105.7ben_DebtOfConsolidatedSponsoredInvestmentProducts
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= ben_TotalViesAndSipsMember		 122.3ben_DebtOfConsolidatedSponsoredInvestmentProducts
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= ben_TotalViesAndSipsMember
Total Debt $ 901.2ben_TotalDebt
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= ben_TotalViesAndSipsMember		 $ 950.8ben_TotalDebt
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= ben_TotalViesAndSipsMember