Employee Benefit Plan, Description of Plan - Narrative (Details) - EBP 003 - USD ($)	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
EBP, Description of Plan [Line Items]
EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage	50.00%
Participant Catch up Contribution Year Age	50
EBP, Employer Contribution, Matching Percentage	85.00%
EBP, Forfeited Nonvested Account, Decrease from Administrative Expense	$ 495,488
EBP, Forfeited Nonvested Account	$ 385,279	$ 88,524
EBP, Participant Contribution, Automatic, Annual Increase Deferral Rate	1.00%
EBP, Employer Contribution Vesting Requisite Service Period	3
EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage	50.00%
EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount	$ 1,000
EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount	$ 50,000
EBP, Note Receivable from Participant, Maximum Number of Notes Outstanding	2
EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term	5 years
EBP, Note Receivable From Participant, Account, Primary Residence, Maximum Borrowing Term	15 years
EBP, Participant Loan, Basis Spread On Variable Rate	1.00%
EBP, Employer Contribution Vesting Percentage	100.00%
Defined Contribution Plan Automatic Cash Out Threshold Amount	$ 7,000
Participant Contribution, Performance Bonuses and Commissions, Percentage	100.00%
Note Receivable from Merged Plan, Maximum Number of Notes Outstanding	3
EBP, Change in Net Asset Available for Benefit, Transfer to (from) Plan	$ 394,752,722	$ 0
EBP, Change in Net Asset Available for Benefit, Transfer to (from) Plan	396,546,640
Notes Receivables from Participants, Transfer to (from) External Plan	$ 1,793,918
EBP, Transfer From (to) Merger- Employer Contribution Vesting Service Period	5
EBP, Transfer From (To) Merger-Employer Contribution Vesting Percentage	100.00%
Minimum
EBP, Description of Plan [Line Items]
EBP, Participant Contribution, Automatic, Deferral Rate	6.00%
Maximum
EBP, Description of Plan [Line Items]
EBP, Participant Contribution, Automatic, Deferral Rate	15.00%

EBP, Employer Contribution Vesting Percentage

No definition available.

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Balance Type:	na
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- Definition

EBP, Employer Contribution Vesting Service Period

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

EBP, Net Assets Available For Benefits, Transfer to (from) External Plan

+ References

No definition available.

+ Details

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Namespace Prefix:	ben_
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Balance Type:	debit
Period Type:	instant

- Definition

EBP, Note Receivable from Merged Plan, Maximum Number of Notes Outstanding

+ References

No definition available.

+ Details

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- Definition

EBP, Note Receivable From Participant, Account, Primary Residence, Maximum Borrowing Term

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

EBP, Note Receivable from Participant, Maximum Number of Notes Outstanding

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

EBP, Notes Receivable from Participants, Transfer to (from) External Plan

+ References

No definition available.

+ Details

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Namespace Prefix:	ben_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

EBP, Participant Account Auto Distribution Threshold Amount

+ References

No definition available.

+ Details

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Namespace Prefix:	ben_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

EBP, Participant Catch up Contribution Year Age

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

EBP, Participant Contribution, Automatic, Annual Increase Deferral Rate

+ References

No definition available.

+ Details

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Namespace Prefix:	ben_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

EBP, Participant Contribution, Performance Bonuses and Commissions, Percentage

+ References

No definition available.

+ Details

Name:	ben_EBPParticipantContributionPerformanceBonusesAndCommissionsPercentage
Namespace Prefix:	ben_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

EBP, Participant Loan, Basis Spread On Variable Rate

+ References

No definition available.

+ Details

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Namespace Prefix:	ben_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

EBP, Transfer to (from) External Plan- Employer Contribution Vesting Percentage

+ References

No definition available.

+ Details

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Namespace Prefix:	ben_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

EBP, Transfer to (from) External Plan- Employer Contribution Vesting Service Period

+ References

No definition available.

+ Details

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Namespace Prefix:	ben_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of net asset available for benefit transferred to (from) employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) from (to) external plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478873/962-325-55-17

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-05(a)(Schedule III))
-SubTopic 205
-Topic 962
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 45
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477063/962-205-45-8

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-SubTopic 205
-Topic 962
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of employer matching contribution on eligible participant contribution to employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

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Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of plan asset, in forfeited nonvested account, no longer allocated to participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

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Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of decrease in forfeited nonvested account of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) from administrative expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (j)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-04(5)(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

+ Details

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Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of maximum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow.

+ References

+ Details

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Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage of maximum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow to total participant account balance.

+ References

+ Details

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- Definition

Amount of minimum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage of eligible compensation contributed for participant automatically enrolled in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

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Period Type:	duration

- Definition

Percentage of maximum pretax annual compensation that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), is permitted to contribute to total pretax annual compensation.

+ References

+ Details

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- Details

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