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v3.25.2

Revenues Narratives (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Revenue from Contract with Customer [Abstract] |  |  |  |
Revenue From Sponsored Funds | 83.00% | 82.00% | 83.00% | 82.00%

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