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Revenues Narratives (Details)	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
Revenue From Sponsored Funds	83.00%	83.00%

X

- Definition

Percentage of operating revenues earned from sponsored funds.

+ References

No definition available.

+ Details

Name:	ben_RevenueFromSponsoredFunds
Namespace Prefix:	ben_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration