XML 143 R34.htm IDEA: XBRL DOCUMENT v3.25.1

Revenues Narratives (Details)	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Revenue from Contract with Customer [Abstract]
Revenue From Sponsored Funds	83.00%	83.00%	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