Consolidated Income Statements (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Revenues:
Sales of physical commodities	$ 68,812.5	$ 75,123.4	$ 46,709.2
Trading gains, net	248.4	205.7	86.5
Commission and clearing fees	161.0	134.5	119.9
Consulting and management fees	27.9	22.7	17.2
Interest income	10.3	10.3	7.0
Other Income	0.5	1.0	0.5
Total revenues	69,260.6	75,497.6	46,940.3
Cost of sales of physical commodities	68,802.9	75,074.4	46,671.3
Operating revenues	457.7	423.2	269.0
Interest expense	11.6	11.3	9.9
Net revenues	446.1	411.9	259.1
Non-interest expenses:
Compensation and benefits	202.4	176.6	104.2
Clearing and related expenses	107.2	77.4	68.2
Introducing broker commissions	31.0	24.0	18.9
Communication and data services	22.6	15.5	11.1
Occupancy and equipment rental	11.0	8.9	6.2
Professional Fees	12.9	10.6	8.1
Depreciation and amortization	7.2	4.7	1.6
Bad debts and impairments	1.5	6.2	5.8
Other	31.0	28.5	17.1
Total non-interest expenses	426.8	352.4	241.2
Income from continuing operations, before tax	19.3	59.5	17.9
Income tax expense	4.4	22.5	6.4
Net income from continuing operations	14.9	37.0	11.5
Income from discontinued operations, net of tax	0	0.2	0.6
Income before extraordinary loss	14.9	37.2	12.1
Extraordinary loss	0	0	(7.0)
Net income	14.9	37.2	5.1
Add: Net loss attributable to noncontrolling interests	0.1	0.1	0.3
Net income attributable to INTL FCStone Inc. common stockholders	15.0	37.3	5.4
Basic earnings per share:
Income from continuing operations attributable to INTL FCStone Inc. common stockholders	$ 0.79	$ 2.06	$ 0.68
Income from discontinued operations attributable to INTL FCStone Inc. common stockholders	$ 0.00	$ 0.01	$ 0.03
Extraordinary loss attributable to INTL FCStone Inc. common stockholders	$ 0	$ 0.00	$ (0.40)
Net income attributable to INTL FCStone Inc. common stockholders	$ 0.79	$ 2.07	$ 0.31
Diluted earnings per share:
Income from continuing operations attributable to INTL FCStone Inc. common stockholders	$ 0.75	$ 1.95	$ 0.66
Income from discontinued operations attributable to INTL FCStone Inc. common stockholders	$ 0.00	$ 0.01	$ 0.03
Extraordinary loss attributable to INTL FCStone Inc. common stockholders	$ 0	$ 0.00	$ (0.39)
Net income attributable to INTL FCStone Inc. common stockholders	$ 0.75	$ 1.96	$ 0.30
Weighted-average number of common shares outstanding:
Basic	18,282,939	17,618,085	17,306,019
Diluted	19,156,899	18,567,454	17,883,233
Amounts attributable to INTL FCStone Inc. common stockholders:
Income from continuing operations, net of tax	15.0	37.1	11.8
Income from discontinued operations, net of tax	0	0.2	0.6
Extraordinary loss	0	0	(7.0)
Net income attributable to INTL FCStone Inc. common stockholders	$ 15.0	$ 37.3	$ 5.4