Condensed Consolidated Income Statements Statement (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Revenues:
Sales of physical commodities	$ 17,175.9	$ 16,208.8
Trading gains	73.4	17.1
Commission and clearing fees	32.0	37.5
Consulting and management fees	6.2	4.5
Interest income	2.7	2.5
Other income	0.2	0.4
Total revenues	17,290.4	16,270.8
Cost of sales of physical commodities	17,194.1	16,174.1
Operating revenues	96.3	96.7
Interest expense	2.1	3.8
Net revenues	94.2	92.9
Non-interest expenses:
Compensation and benefits	45.8	42.5
Clearing and related expenses	22.7	20.2
Communication and data services	4.6	3.5
Introducing broker commissions	5.8	5.4
Occupancy and equipment rental	2.8	1.8
Professional fees	2.7	2.1
Depreciation and amortization	1.5	1.0
Bad debts and impairments	0.1	2.4
Other	8.9	8.1
Total non-interest expenses	94.9	87.0
(Loss) income from continuing operations, before tax	(0.7)	5.9
Income tax (benefit) expense	(0.2)	2.1
Net (loss) income from continuing operations	(0.5)	3.8
Income from discontinued operations, net of tax	0	0.2
Net (loss) income	(0.5)	4.0
Add: Net loss attributable to noncontrolling interests	(0.1)	0
Net (loss) income attributable to INTL FCStone Inc. common stockholders	(0.4)	4.0
Basic (loss) earnings per share:
(Loss) income from continuing operations attributable to INTL FCStone Inc. common stockholders	$ (0.02)	$ 0.22
Income from discontinued operations attributable to INTL FCStone Inc. common stockholders	$ 0.00	$ 0.01
Net (loss) income attributable to INTL FCStone Inc. common stockholders	$ (0.02)	$ 0.23
Diluted (loss) earnings per share:
(Loss) income from continuing operations attributable to INTL FCStone Inc. common stockholders	$ (0.02)	$ 0.21
Income from discontinued operations attributable to INTL FCStone Inc. common stockholders	$ 0.00	$ 0.01
Net (loss) income attributable to INTL FCStone Inc. common stockholders	$ (0.02)	$ 0.22
Weighted-average number of common shares outstanding:
Basic	18,163,489	17,423,098
Diluted	18,163,489	18,424,125
Amounts attributable to INTL FCStone Inc. common stockholders:
(Loss) income from continuing operations, net of tax	(0.4)	3.8
Income (loss) from discontinued operations, net of tax	0	0.2
Net (loss) income	$ (0.4)	$ 4.0