Consolidated Income Statements Statement (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Revenues:
Sales of physical commodities	$ 75,123.4	$ 46,709.2	$ 43,554.0
Trading gains	205.7	86.5	39.1
Commission and clearing fees	134.5	119.9	6.5
Consulting and management fees	22.7	17.2	1.9
Interest income	10.3	7.0	1.8
Other income	1.0	0.5	0.4
Total revenues	75,497.6	46,940.3	43,603.7
Cost of sales of physical commodities	75,074.4	46,671.3	43,513.1
Operating revenues	423.2	269.0	90.6
Interest expense	11.3	9.9	8.0
Net revenues	411.9	259.1	82.6
Non-interest expenses:
Compensation and benefits	176.6	104.2	40.2
Clearing and related expenses	77.4	68.2	16.0
Communication and data services	15.5	11.1	2.1
Introducing broker commissions	24.0	18.9	0
Occupancy and equipment rental	8.9	6.2	1.1
Professional fees	10.6	8.1	2.2
Depreciation and amortization	4.7	1.6	0.8
Bad debts and impairments	6.2	5.8	3.0
Other	28.5	17.1	3.9
Total non-interest expenses	352.4	241.2	69.3
Income from continuing operations, before tax	59.5	17.9	13.3
Income tax expense	22.5	6.4	2.6
Income from continuing operations	37.0	11.5	10.7
Income (loss) from discontinued operations, net of tax	0.2	0.6	(1.1)
Income before extraordinary (loss) income	37.2	12.1	9.6
Extraordinary (loss) income	0	(7.0)	18.5
Net income	37.2	5.1	28.1
Add: Net loss (income) attributable to noncontrolling interests	0.1	0.3	0.5
Net income attributable to INTL FCStone Inc. common stockholders	37.3	5.4	27.6
Basic earnings per share:
Income from continuing operations attributable to INTL FCStone Inc. common stockholders	$ 2.06	$ 0.68	$ 1.16
Income (loss) from discontinued operations attributable to INTL FCStone Inc. common stockholders	$ 0.01	$ 0.03	$ (0.13)
Extraordinary (loss) income attributable to INTL FCStone Inc. common stockholders	$ 0.00	$ (0.40)	$ 2.08
Net income attributable to INTL FCStone Inc. common stockholders	$ 2.07	$ 0.31	$ 3.11
Diluted earnings per share:
Income from continuing operations attributable to INTL FCStone Inc. common stockholders	$ 1.95	$ 0.66	$ 1.1
Income (loss) from discontinued operations attributable to INTL FCStone Inc. common stockholders	$ 0.01	$ 0.03	$ (0.12)
Extraordinary (loss) income attributable to INTL FCStone Inc. common stockholders	$ 0.00	$ (0.39)	$ 1.82
Net income attributable to INTL FCStone Inc. common stockholders	$ 1.96	$ 0.3	$ 2.8
Weighted-average number of common shares outstanding:
Basic	17,618,085	17,306,019	8,895,697
Diluted	18,567,454	17,883,233	10,182,586
Amounts attributable to INTL FCStone Inc. common stockholders:
Income from continuing operations, net of tax	37.1	11.8	10.2
Income (loss) from discontinued operations, net of tax	0.2	0.6	(1.1)
Extraordinary (loss) income	0	(7.0)	18.5
Net Income	$ 37.3	$ 5.4	$ 27.6