Consolidated Income Statements (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Revenues:
Sales of physical commodities	$ 33,546.4	$ 42,031.2	$ 66,249.4
Trading gains, net	244.5	244.0	246.8
Commission and clearing fees	180.7	173.3	161.0
Consulting and management fees	42.1	35.1	27.9
Interest income	8.0	8.9	8.0
Other Income	0.7	0.9	0.3
Total revenues	34,022.4	42,493.4	66,693.4
Cost of sales of physical commodities	33,531.5	42,025.2	66,245.3
Operating revenues	490.9	468.2	448.1
Transaction-based clearing expenses	108.5	110.1	105.3
Introducing broker commissions	49.9	40.5	31.0
Interest expense	10.5	7.9	5.6
Net operating revenues	322.0	309.7	306.2
Compensation and other expenses:
Compensation and benefits	201.9	198.7	197.2
Communication and data services	25.8	23.1	22.4
Occupancy and equipment rental	12.3	12.0	11.0
Professional fees	14.9	12.4	12.6
Travel and business development	9.9	10.4	10.4
Depreciation and amortization	7.3	8.0	7.2
Bad debts and impairments	5.5	0.8	1.5
Other	18.4	23.1	21.4
Total compensation and other expenses	296.0	288.5	283.7
Income from continuing operations, before tax	26.0	21.2	22.5
Income tax expense	6.4	2.6	5.5
Net income from continuing operations	19.6	18.6	17.0
(Loss) income from discontinued operations, net of tax	(0.3)	0.7	(4.3)
Net income	19.3	19.3	12.7
Add: Net loss attributable to noncontrolling interests	0	0	0.1
Net income attributable to INTL FCStone Inc. common stockholders	19.3	19.3	12.8
Basic earnings per share:
Income from continuing operations attributable to INTL FCStone Inc. common stockholders	$ 1.03	$ 0.97	$ 0.90
(Loss) income from discontinued operations attributable to INTL FCStone Inc. common stockholders	$ (0.02)	$ 0.04	$ (0.23)
Net income attributable to INTL FCStone Inc. common stockholders	$ 1.01	$ 1.01	$ 0.67
Diluted earnings per share:
Income from continuing operations attributable to INTL FCStone Inc. common stockholders	$ 1.00	$ 0.93	$ 0.86
(Loss) income from discontinued operations attributable to INTL FCStone Inc. common stockholders	$ (0.02)	$ 0.04	$ (0.22)
Net income attributable to INTL FCStone Inc. common stockholders	$ 0.98	$ 0.97	$ 0.64
Weighted-average number of common shares outstanding:
Basic	18,528,302	18,443,233	18,282,939
Diluted	19,132,302	19,068,497	19,156,899
Amounts attributable to INTL FCStone Inc. common stockholders:
Income from continuing operations, net of tax	19.6	18.6	17.1
(Loss) income from discontinued operations, net of tax	(0.3)	0.7	(4.3)
Net income attributable to INTL FCStone Inc. common stockholders	$ 19.3	$ 19.3	$ 12.8