Document and Entity Information Document (USD $)	12 Months Ended
	Sep. 30, 2012	Oct. 31, 2012	Mar. 30, 2012
Document Information [Line Items]
Entity Registrant Name	Franklin Resources Inc
Entity Central Index Key	0000038777
Document Type	10-K
Document Period End Date	Sep. 30, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 15,571,362,732
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		212,293,567