Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Operating Revenues
Operating revenues	$ 2,122.9	$ 1,969.0	$ 6,266.8	$ 5,863.3
Operating Expenses
Compensation and benefits	893.8	841.2	2,890.3	2,667.7
Sales, distribution and marketing	481.1	406.8	1,366.2	1,202.0
Information systems and technology	156.6	127.3	442.7	376.7
Occupancy	104.8	56.9	247.7	171.1
Amortization of intangible assets	84.0	85.4	254.4	254.6
General, administrative and other	180.1	136.5	507.2	427.2
Total operating expenses	1,900.4	1,654.1	5,708.5	5,099.3
Operating Income	222.5	314.9	558.3	764.0
Other Income (Expenses)
Investment and other income, net	74.5	49.8	300.2	200.3
Interest expense	(25.7)	(34.9)	(72.2)	(99.3)
Other income, net	77.6	15.8	311.1	160.6
Income before taxes	300.1	330.7	869.4	924.6
Taxes on income	68.1	84.1	205.8	237.3
Net income	232.0	246.6	663.6	687.3
Less: net income (loss) attributable to
Redeemable noncontrolling interests	43.0	26.8	95.3	108.5
Nonredeemable noncontrolling interests	15.0	(7.7)	18.8	(8.5)
Net income attributable to Franklin Resources, Inc.	$ 174.0	$ 227.5	$ 549.5	$ 587.3
Earnings per Share
Basic	$ 0.32	$ 0.44	$ 1.04	$ 1.14
Diluted	$ 0.32	$ 0.44	$ 1.03	$ 1.14
CIPs [Member]
Other Income (Expenses)
Investment and other income, net	$ 37.6	$ 1.7	$ 103.7	$ 75.3
Expenses of consolidated investment products	(8.8)	(0.8)	(20.6)	(15.7)
Less: net income (loss) attributable to
Redeemable noncontrolling interests	30.8	10.5	60.6	68.5
Investment management fees [Member]
Operating Revenues
Operating revenues	1,689.9	1,613.4	5,056.0	4,818.5
Sales and distribution fees [Member]
Operating Revenues
Operating revenues	358.3	304.0	1,013.0	897.3
Shareholder servicing fees [Member]
Operating Revenues
Operating revenues	61.8	38.8	162.3	115.5
Other [Member]
Operating Revenues
Operating revenues	$ 12.9	$ 12.8	$ 35.5	$ 32.0